BE-1

BODY ELECTRICAL - BODY ELECTRICAL SYSTEM

BODY ELECTRICAL SYSTEM

BE01I-15

PRECAUTION
HINT:
Take care to observe the following precautions when performing inspections or removal and replacement
of body electrical related parts.
1. HEADLIGHT SYSTEM

Halogen bulbs have pressurized gas inside and require special handling. They can burst if scratched
or dropped. Hold a bulb only by its plastic or metal case. Don’t touch the glass part of a bulb with bare
hands.

When high voltage socket of discharge headlight is touched with the light control switch HEAD, high
voltage of 20,000 V is momentarily generated. This might lead to a serious accident.

Never connect the tester to the high voltage socket of discharge headlight for measurement, as this
leads to a serious accident because of high voltage.

When performing operation related to the discharge headlight, make sure to do it in the place with no
water of rain to prevent electric shock, with light control switch OFF, battery terminal removed, connec-
tor of light control ECU disconnected.

When performing operation related to the discharge headlight, make sure to do it after assembling has
been completely over and never light up without a bulb installed.

Do not light up the discharge headlight using another power source except vehicle’s.

When there is a defect on the discharge headlight or any shock has been applied to it, replace the light
with a new one.
Even if the light operates normally, there is a possibility that the fail-safe function works.
2. SRS (SUPPLEMENTAL RESTRAINT SYSTEM)
The LEXUS IS300 is equipped with an SRS (Supplemental Restraint System) such as the driver airbag, front
passenger airbag, side airbag, curtain shield airbag. Failure to carry out service operation in the correct se-
quence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious acci-
dent. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read
the precautionary notices in the RS section.
3. AUDIO SYSTEM
If the negative (-) terminal cable is disconnected from the battery, the preset AM, FM 1 and FM 2 stations
stored in memory are erased, so make sure to note the stations and reset them after the negative (-) terminal
cable is reconnected to the battery.
4. MOBILE COMMUNICATION SYSTEM
If the vehicle is equipped with a mobile communication system, refer to precautions in the IN section.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2002

BE-2
BODY ELECTRICAL - TROUBLESHOOTING

TROUBLESHOOTING
BE16S-06

PROBLEM SYMPTOMS TABLE

IGNITION SWITCH AND
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
Symptom Suspect Area See page
11.Ignition switch BE-21
Ignition switch is not set to each position.
12.Power source circuit -

KEY UNLOCK WARNING SWITCH

This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
Symptom Suspect Area See page
1. Ignition Switch BE-21
2. Key Unlock Warning Switch BE-21
Key unlock warning system does not operate.
3. Body ECU DI-893
(The buzzer sounds when the ignition key is ACC or ON)
4. Combination Meter BE-90
5. Wire Harness -

w/o Daytime running light system:

HEADLIGHT AND TAILLIGHT SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
HINT:
To inspect the bulb and light control ECU, replace them with the ones working normally and judge whether
they work normally or not.
Symptom Suspect Area See page
1. Automatic Light Control Sensor BE-31
2. Light Control Switch BE-31
3. Door Courtesy Switch BE-58
”Automatic light control system” does not operate.
4. Wire Harness -
5. Theft Deterrent ECU DI-776
6. Body ECU DI-893

Auto turn-off system does not operate when the driver’s door is 1. Drivers Door Courtesy Switch BE-58
opened. 2. Body ECU DI-893

Auto turn-off system: 1. Body ECU DI-893

Headlight and taillight do not come on. 2. Wire Harness -

Auto turn-off system: 1. Body ECU DI-893

Headlight and taillight stay on. 2. Wire Harness -
1. Bulb -
Only one headlight comes on. 2. Light Control Sensor BE-31
3. Wire Harness -
1. Headlight Control Relay BE-31
”LO-Beam” does not light (All). 2. Light Control Sensor BE-31
3. Wire Harness -
1. Bulb -
2. H-LP L-LWR Fuse BE-15
”LO-Beam” does not light (One side).
3. H-LP R-LWR Fuse BE-15
4. Wire Harness -

1. Headlight Dimmer Switch BE-31

”HI-Beam” does not light (All).
2. Wire Harness -

Author
: Date
: 2003

 BE-3
BODY ELECTRICAL - TROUBLESHOOTING

1. Bulb -
2. H-LP L-UPR Fuse BE-15
”HI-Beam” does not light (One side).
3. H-LP R-UPR Fuse BE-15
4. Wire Harness -

1. H-LP L-UPR Fuse BE-15

2. H-LP R-UPR Fuse BE-15
”Flash” does not light. 3. Headlight Dimmer Switch BE-31
4. Light Control ECU -
5. Wire Harness -
1. Bulb -
”Flash” does not light. 2. Light Control ECU -
3. Wire Harness -
1. Headlight Control Relay BE-31
2. Light Control Switch BE-31
Headlight does not come on.
3. Light Control ECU -
4. Wire Harness -

1. Bulb -
Headlight does not come on. 2. Light Control ECU -
3. Wire Harness -
1. Bulb -
Headlight flickers. 2. Light Control ECU -
3. Wire Harness -
1. Bulb -
Headlight is dark. 2. Light Control ECU -
3. Wire Harness -
1. Bulb -
Only one taillight comes on.
2. Wire Harness -

1. TAIL Fuse BE-15

2. GAUGE Fuse BE-15
Taillight does not come on. 3. Taillight Control Relay BE-31
(Headlight is normal) 4. Light Failure Relay BE-31
5. Light Control Switch BE-31
6. Wire Harness -

Taillight does not come on. 1. Light Control Switch BE-31

(Headlight does not light) 2. Wire Harness -
1. Light Failure Relay BE-31
Rear combination light does not come on. 2. Wire Harness -
3. Bulb -

Author
: Date
: 2004

BE-4
BODY ELECTRICAL - TROUBLESHOOTING

w/ Daytime running light system:

HEADLIGHT AND TAILLIGHT SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
HINT:
To inspect the bulb and light control ECU, replace them with the ones working normally and judge whether
they work normally or not.
Symptom Suspect Area See page
1. Automatic Light Control Sensor BE-31
2. Light Control Switch BE-31
3. Door Courtesy Switch BE-58
”Automatic light control system” does not operate.
4. Wire Harness -
5. Theft Deterrent ECU DI-776
6. Body ECU DI-893

Auto turn-off system does not operate when the driver’s door is 1. Drivers Door Courtesy Switch BE-58
opened. 2. Body ECU DI-893
Auto turn-off system: 1. Body ECU DI-893
Headlight and taillight do not come on. 2. Wire Harness -

Auto turn-off system: 1. Body ECU DI-893

Headlight and taillight stay on. 2. Wire Harness -

1. Daytime Running Light No. 2 Relay BE-31

2. Daytime Running Light Main Relay BE-31
3. Bulb -
Only one headlight comes on.
4. Light Control ECU -
5. Wire Harness -
6. Combination Meter BE-90

1. Headlight Control Relay BE-31

”LO-Beam” does not light (All). 2. Light Control ECU -
3. Wire Harness -
1. Bulb -
2. H-LP L-LWR Fuse BE-15
”LO-Beam” does not light (One side). 3. H-LP R-LWR Fuse BE-15
4. Light Control ECU -
5. Wire Harness -
1. Headlight Dimmer Switch BE-31
2. Daytime Running Light Main Relay BE-31
”HI-Beam” does not light (All).
3. Wire Harness -
4. Combination Meter BE-90

1. Bulb -
2. H-LP L-UPR Fuse BE-15
”HI-Beam” does not light (One side). 3. H-LP R-UPR Fuse BE-15
4. Daytime Running Light No. 2 Relay BE-31
5. Wire Harness -
1. Headlight Dimmer Switch BE-31
2. Daytime Running Light Main Relay BE-31
”Flash” does not light.
3. Wire Harness -
4. Combination Meter BE-90

Author
: Date
: 2005

 BE-5
BODY ELECTRICAL - TROUBLESHOOTING

1. Headlight Control Relay BE-31

2. Daytime Running Light Main Relay BE-31
3. Daytime Running Light No.2 Relay BE-31
4. Headlight Dimmer Switch BE-31
Headlight does not come on. 5. Light Control Switch BE-31
6. Wire Harness -
7. Light Control ECU -
8. Bulb -
9. Combination Meter BE-90
1. Light Control Switch BE-31
Headlight does not come on with light control switch in HEAD. 2. Light Control ECU -
3. Wire Harness -
1. Headlight Control Relay BE-31
Headlight does not go out with light control switch in OFF. 2. Light Control ECU -
3. Wire Harness -
1. Bulb -
Headlight flickers. 2. Light Control ECU -
3. Wire Harness -
1. Bulb -
Headlight is dark. 2. Light Control ECU -
3. Wire Harness -
1. Taillight Control Relay BE-31
Taillight does not come on with light control switch in TAIL. 2. Light Control Switch BE-31
3. Wire Harness -
1. Taillight Control Relay BE-31
Taillight does not go out with light control switch in OFF. 2. Light Control Switch BE-31
3. Wire Harness -
1. ECU-B Fuse BE-15
2. GAUGE Fuse BE-15
3. Daytime Running Light Main Relay BE-31
Headlight does not come on with engine running and light control 4. Daytime Running Light No.2 Relay BE-31
switch in OFF. 5. Generator L Terminal BE-90
6. Parking Brake Switch BE-90
7. Wire Harness -
8. Combination Meter -
HID type headlight:
HEADLIGHT BEAM LEVEL CONTROL SYSTEM
Symptom Suspect Area See page
1. ECU-IG Fuse BE-15
Beam axis is not controlled. (It is not initialized.) 2. Headlight Beam Level Control Actuator BE-31
Headlight Beam Level Control System does not operate. 3. Headlight Beam Level Control ECU BE-31
4. Wire Harness Side -
1. Height Control Sensor -
Beam axis is not controlled. (It is initialized.)
2. Headlight Beam Level Control ECU BE-31
Headlight Beam Level Control System does not operate.
3. Wire Harness Side -
1. Height Control Sensor -
Controlled angle of head light is unusual. 2. Headlight Beam Level Control ECU BE-31
(The angle is controlled.) 3. Headlights BE-31
4. Wire Harness Side -

1. ABS System -
Beam axis position is not stable during driving. 2. Headlights BE-31
3. Wire Harness -

Author
: Date
: 2006

BE-6
BODY ELECTRICAL - TROUBLESHOOTING

FOG LIGHT SYSTEM

This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
Symptom Suspect Area See page
1. Bulbs -
2. FR FOG Fuse BE-15
Front fog light does not light up with light control SW TAIL or
3. Front Fog Light Relay BE-48
HEAD (LO-beam only). (Headlight is normal.)
4. Front Fog Light Switch BE-48
5. Wire Harness -
1. Bulbs -
Only one light does not light.
2. Wire Harness -
1. Bulbs -
Rear fog light does not light with light control SW HEAD. 2. ECU-B2 Fuse BE-15
(Headlight is normal.) 3. Rear Fog Light Switch BE-48
4. Wire Harness -

Rear fog light does not light with light control SW HEAD. 1. Inspect Headlight and Taillight System BE-2
(Headlight does not light.) 2. Wire Harness -

1. Bulbs -
Only one light does not light.
2. Wire Harness -

TURN SIGNAL AND HAZARD WARNING SYSTEM

This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
Symptom Suspect Area See page
1. GAUGE Fuse BE-15
2. TURN HAZ Fuse BE-15
”Hazard” and ”Turn” do not light up. 3. Ignition Switch BE-21
4. Turn Signal Flasher Relay BE-53
5. Wire Harness -
Hazard warning light does not light up. 1. A/C Control Panel AC-79
(Turn is normal) 2. Wire Harness -

Turn signal does not light up. 1. Turn Signal Switch BE-53
(Hazard is normal) 2. Wire Harness -

1. Turn Signal Switch BE-53

Turn signal does not light up in one direction.
2. Wire Harness -
1. Bulb -
Only one bulb does not light up.
2. Wire Harness -

INTERIOR LIGHT SYSTEM

This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
Symptom Suspect Area See page
All the lights do not come ON. DOME Fuse BE-15
1. Driver’s Door Courtesy Switch BE-58
The driver door courtesy light does not come ON when the
2. Wire Harness -
driver’s door is opened.
3. Body ECU DI-893
1. Passenger’s Door Courtesy Switch BE-58
The passenger door courtesy light does not come ON when the
2. Wire Harness -
passenger’s door is opened.
3. Body ECU DI-893
1. Rear-Right Door Courtesy Switch BE-58
The room light does not come on when the rear-right door is 2. Wire Harness -
opened. 3. Body ECU DI-893
4. Room Light BE-58

Author
: Date
: 2007

 BE-7
BODY ELECTRICAL - TROUBLESHOOTING

1. Rear-Left Door Courtesy Switch BE-58

The room light does not come on when the rear-left door is 2. Wire Harness -
opened. 3. Body ECU DI-893
4. Room Light BE-58

Only one of the bulbs comes ON. Bulb -

1. Courtesy Switch BE-58
The illumination does not fade out when all the doors are closed. 2. Wire Harness -
3. Body ECU DI-893
1. Ignition Switch BE-21
The illumination does not fade out immediately when the ignition 2. RADIO NO.2 Fuse BE-15
switch is turned to ACC or ON within 15 seconds after all the 3. GAUGE Fuse BE-15
doors are closed. 4. Wire Harness -
5. Body ECU DI-893
1. Door Unlock Detection Switch BE-121
The illumination does not fade out immediately when all the doors
2. Wire Harness -
are locked within 15 seconds after they are closed.
3. Body ECU DI-893
1. Bulb -
Interior light does not light up.
2. Front Personal Light BE-58
(in front personal light)
3. Wire Harness -
1. Bulb -
Front personal light does not light up. 2. Front Personal Light BE-58
3. Wire Harness -
1. Bulb -
Rear personal light does not light up. 2. Rear Personal Light BE-58
3. Wire Harness -
1. Bulb -
Vanity light does not light up. 2. Vanity Light BE-58
3. Wire Harness -
1. Bulb -
Luggage compartment light does not light up. 2. Luggage Compartment Door Courtesy Switch BE-58
3. Wire Harness -
1. Bulb -
2. Door Courtesy Switch BE-58
Courtesy light does not light up.
3. Wire Harness -
4. Body ECU DI-893

BACK-UP LIGHT SYSTEM

Symptom Suspect Area See page
1. GAUGE Fuse BE-15
2. Ignition Switch BE-21
Back-Up Light does not light up.
3. Wire Harness -
4. Bulb -

1. Park/Neutral Position Switch (A/T) DI-371

Back-Up Light remains always on. Back-up Light Switch (M/T) BE-65
2. Wire Harness -
1. Bulb -
Only one light does not light up.
2. Wire Harness -

Author
: Date
: 2008

BE-8
BODY ELECTRICAL - TROUBLESHOOTING

STOP LIGHT SYSTEM

Symptom Suspect Area See page
1. STOP Fuse BE-15
2. Stop Light Switch BE-68
Stop light does not light up.
3. Light Failure Relay BE-31
4. Wire Harness -

1. Stop Light Switch BE-68

Stop light always lights up.
2. Wire Harness -

Only one light always lights up. Wire Harness -

1. Bulb -
Only one light does not light up.
2. Wire Harness -

HEADLIGHT CLEANER SYSTEM

Symptom Suspect Area See page
1. H-LP CLN Fuse BE-15
2. WASHER Fuse BE-15
3. Ignition Switch BE-21
”Headlight Cleaner System” does not operate 4. Headlight Cleaner Switch BE-70
(All) 5. Headlight Cleaner Relay BE-70
6. Headlight Cleaner Motor BE-70
7. Headlight Cleaner Nozzle and Hose -
8. Wire Harness -
Washer fluid does not spray. Headlight Cleaner Nozzle and Hose -

WIPER AND WASHER SYSTEM

Symptom Suspect Area See page
1. WIP Fuse BE-15
2. Wiper Switch BE-75
Wipers and washer do not operate.
3. Wiper Motor BE-75
4. Wire Harness -

1. Wiper Switch BE-75

Wipers do not operate in LO, HI or MIST. 2. Wiper Motor BE-75
3. Wire Harness -
1. Wiper Switch BE-75
Wipers do not operate in INT. 2. Wiper Motor BE-75
3. Wire Harness -
1. WASHER Fuse BE-15
2. Washer Switch BE-75
Washer motor does not operate.
3. Washer Motor BE-75
4. Wire Harness -

1. WASHER Fuse BE-15

2. Washer Switch BE-75
Wipers do not operate when washer switch ON.
3. Wiper Motor BE-75
4. Wire Harness -

Washer fluid does not operate. Washer Hose and Nozzle -

When wiper switch is in HI position, the wiper blade is in contact
with the body. 1. Wiper Motor *1 BE-75

When the wiper switch is OFF, the wiper blade does not retract 2. Wire harness *1 -
or the retract position is wrong.
1. WIPER Fuse -
2. Rear Wiper Motor BE-75
Rear wiper does not operate.
3. Rear Wiper Switch BE-75
4. Wire Harness -

Author
: Date
: 2009

 BE-9
BODY ELECTRICAL - TROUBLESHOOTING

1. Rear Wiper Switch BE-75

Rear wiper does not operate in INT or ON position.
2. Wire Harness -

1. Rear Wiper Motor BE-75

Rear wiper does not return to OFF position.
2. Wire Harness -
1. Rear Washer Motor BE-75
Rear Washer Motor does not operate. 2. Rear Washer Switch BE-75
3. Wire Harness -

*1: Inspect wiper arm and blade set positions.

COMBINATION METER
 This system uses the multiplex communication system, so check diagnosis system of the multiplex
communication system before you proceed with troubleshooting.
 Refer to DI section for warning light or indicator light not described in the table below.
Symptom Suspect Area See page
1. Bulb -
2. Driver Buckle Switch CIrcuit BE-90
Driver seat belt warning light does not light up. 3. Meter Circuit Plate BE-90
4. Wire Harness -
5. Body ECU DI-893
1. Passenger Buckle Switch CIrcuit BE-90
2. Occupant Detection Sensor BE-90
Passenger seat belt warning light does not light up.
3. A/C Control Panel DI-1009
(in A/C control panel)
4. Wire Harness -
5. A/C ECU DI-1009
1. MPX-B Fuse BE-15
2. SRS-B Fuse BE-15
3. Bulb -
SRS warning light does not light up.
4. Meter Circuit Plate BE-90
5. Wire Harness -
6. Airbag Sensor Assembly DI-605

1. Bulb -
2. Meter Circuit Plate BE-90
Hi-beam indicator light does not light up.
3. Wire Harness -
4. Headlight System BE-31
1. Bulb -
2. Meter Circuit Plate BE-90
Turn indicator light does not light up.
3. Wire Harness -
4. Turn Signal and Hazard Warning System BE-53

1. GAUGE Fuse BE-15

2. Bulb -
ABS warning light does not light up. 3. Meter Circuit Plate BE-90
4. Wire Harness -
5. ABS ECU DI-435
1. GAUGE Fuse BE-15
2. Bulb -
TRAC warning light does not light up. 3. Meter Circuit Plate BE-90
4. Wire Harness -
5. ABS ECU DI-435

Author
: Date
: 2010

BE-10
BODY ELECTRICAL - TROUBLESHOOTING

1. Bulb -
2. Meter Circuit Plate BE-90
Check engine warning light does not light up.
3. Wire Harness -
4. ECM DI-1

1. Bulb -
2. Fuel Level Warning Switch BE-90
Fuel level warning light does not light up.
3. Meter Circuit Plate BE-90
4. Wire Harness -

DEFOGGER SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
Symptom Suspect Area See page
1. HTR Fuse BE-15
2. DEF M-Fuse BE-15
3. Defogger Relay Circuit DI-940
4. Defogger Switch (in A/C Panel Switch) DI-1009
Rear window defogger does not operate. 5. Defogger Wire BE-102
6. Wire Harness -
7. Body ECU DI-893
8. Noise Filter -
9. A/C ECU DI-1009
1. MIR-HTR Fuse (Passenger Side J/B) BE-15
2. Mirror Heater Relay BE-102
Mirror heater does not operate.
3. Mirror Heater BE-102
4. Wire Harness -

POWER WINDOW CONTROL SYSTEM

This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
Symptom Suspect Area See page
1. Power Window Master Switch BE-1 15
All the power windows do not operate.
2. Wire Harness -
(Power Door Lock System is normal.)
3. Body ECU DI-893
1. Power Window Master Switch BE-1 15
2. Power Window Switch BE-1 15
Only the driver’s window does not operate.
3. Power Window Motor BE-1 15
4. Wire Harness -

”Window lock function” does not operate. Power Window Master Switch BE-1 15
Power window control system abnormal operation. TROUBLESHOOTING BE-104

POWER DOOR LOCK CONTROL SYSTEM

This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
Symptom Suspect Area See page
1. Door Lock Control Switch BE-121
All the doors cannot be locked or unlocked.
2. Wire Harness -
(Power Window Control System is normal.)
3. Body ECU DI-893
1. Door Lock Motor BE-121
Only one side door lock control does not operate.
2. Wire Harness -
1. Door Key Lock and Unlock Switch BE-121
Door key related function does not operate. 2. Wire Harness -
3. Body ECU DI-893

Author
: Date
: 2011

 BE-1 1
BODY ELECTRICAL - TROUBLESHOOTING

1. Key Unlock Warning Switch BE-21

2. Door Courtesy Switch BE-58
Key confinement prevention function does not operate.
3. Wire Harness -
4. Body ECU DI-893

1. Luggage Compartment Door Opener Switch BE-121

2. Luggage Compartment Door Opener Motor BE-121
Luggage compartment door opener function does not operate.
3. Wire Harness -
4. Body ECU DI-893

THEFT DETERRENT SYSTEM

 This system uses the multiplex communication system, so check diagnosis system of the multiplex
communication system before you proceed with troubleshooting.
 Refer to DI section for warning light or indicator light not described in the table below.
Symptom Suspect Area See page
1. Indicator Light BE-127
2. Key Unlock Warning Switch BE-21
3. Door Unlock Detection Switch BE-121
The system cannot be set. 4. Engine Hood Courtesy Switch BE-58
5. Luggage Compartment Door Courtesy Switch BE-58
6. Wire Harness -
7. Theft Deterrent ECU DI-776
1. Key Unlock Warning Switch BE-21
2. Ignition Switch BE-21
The system cannot be canceled when the ignition switch is turned
3. RAD NO. 2 Fuse BE-15
to ON with key.
4. Wire Harness -
5. Theft Deterrent ECU DI-776
1. Luggage Compartment Door Courtesy Switch BE-58
The system cannot be canceled when the luggage compartment
2. Wire Harness -
door is unlocked with key.
3. Theft Deterrent ECU DI-776
1. Engine Hood Courtesy Switch BE-58
The system does not operate when the engine hood is opened. 2. Wire Harness -
3. Theft Deterrent ECU DI-776
1. Ignition Switch BE-21
2. Key Unlock Warning Switch BE-21
The system does not operate when the ignition switch is turned to
3. Transmitter BE-136
ACC without using a key or transmitter.
4. Wire Harness -
5. Theft Deterrent ECU DI-776
1. Headlight System BE-31
Some of the system does not operate.
2. Wire Harness -
(Headlight does not light up.)
3. Theft Deterrent ECU DI-776
1. Taillight System BE-31
Some of the system does not operate.
2. Wire Harness -
(Taillight does not light up.)
3. Theft Deterrent ECU DI-776
1. HORN Fuse BE-15
2. Self Power Siren BE-127
Some of the system does not operate. 3. Horn BE-233
(Self power siren or Horn does not sound.) 4. Horn Relay BE-233
5. Wire Harness -
6. Theft Deterrent ECU DI-776

1. Door Key Lock and Unlock Switch BE-121

While the warning is given, the system cannot be canceled by
2. Wire Harness -
unlocking the door with key or transmitter.
3. Theft Deterrent ECU DI-776

Author
: Date
: 2012

BE-12
BODY ELECTRICAL - TROUBLESHOOTING

1. Ignition Switch BE-21

2. Key Unlock Warning Switch BE-21
While the warning is given, the system cannot be canceled by 3. RAD NO. 2 Fuse BE-15
turning the ignition switch to ACC or ON with key. 4. ECU-IG Fuse BE-15
5. Wire Harness -
6. Theft Deterrent ECU DI-776

The system operates for more than 30 seconds. Theft Deterrent ECU DI-776
WIRELESS DOOR LOCK CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
HINT:
 Troubleshooting of the wireless door lock control system is based on the premise that the door lock
control system is operating normally. Accordingly, before troubleshooting the wireless door lock control
system, first make certain that the door lock control system is operating normally.
 If the trouble still reappears even though there are no abnormalities in any of the other circuits, then
check and replace the Wireless Door Lock Control Receiver as the last step.
Symptom Suspect Area See page
1. Transmitter BE-136
2. Wireless Door Lock Control Receiver BE-136
All functions of wireless door lock control system do not operate.
3. Wire Harness -
4. Body ECU DI-893

SLIDING ROOF SYSTEM:

HINT:
The sliding roof system must be initialized after any of the following is done:
 The battery is disconnected.
 The S/ROOF fuse is replaced.
 The sliding roof assembly (sliding roof ECU) is replaced.
 The sliding roof is removed and reinstalled or replaced.
Initialize the sliding roof system as follows:
 Using the tilt switch, tilt the roof fully upward, and then fully downward.
 Using the slide switch, fully open the roof, and then fully close it.
Symptom Suspect Area See page
1. S/ROOF Fuse BE-15
2. ECU-IG Fuse BE-15
Sliding roof system does not operate. 3. Front Personal Light (Sliding Roof Switch) BE-145
4. Sliding Roof Control Assembly BE-145
5. Wire Harness -
1. Foreign object between sliding roof rail and glass -
Sliding roof system stops operation halfway.
2. Incorrect sliding roof adjustment BO-126
(Sliding roof reverses during close (down) operation.)
3. Sliding Roof Control Assembly BE-145
1. Drivers Door Courtesy Switch BE-58
2. Sliding Roof Control Assembly BE-145
Only ”Key-off Sliding Roof Operation*” does not operate.
3. Body ECU DI-893
4. Wire Harness -

*: The sliding roof can be operated for approximately 45 seconds, after the ignition switch is turned from ON
to OFF with all doors closed. However, if the driver side door is opened during this time, the operation is can-
celed.

Author
: Date
: 2013

 BE-13
BODY ELECTRICAL - TROUBLESHOOTING

POWER SEAT CONTROL SYSTEM

Symptom Suspect Area See page
1. P/SEAT Fuse BE-15
Driver’s seat does not operate. 2. Power Seat Switch BE-151
3. Wire Harness -
1. Power Seat Switch BE-151
”Slide operation” does not operate. 2. Wire Harness -
3. Slide Motor BE-151
1. Power Seat Switch BE-151
”Front Vertical Operation” does not operate. 2. Wire Harness -
3. Front Vertical Motor BE-151
1. Power Seat Switch BE-151
”Lifter Operation” does not operate. 2. Wire Harness -
3. Lifter Motor BE-151
1. Power Seat Switch BE-151
”Reclining Operation” does not operate. 2. Wire Harness -
3. Reclining Motor BE-151

(D): Driver’s Seat

(P): Passenger’s Seat
POWER MIRROR CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
Symptom Suspect Area See page
1. Mirror Switch BE-159
Both right and left mirrors do not operate.
2. Wire Harness -

1. Mirror Motor BE-159

Only one side of mirror does not operate.
2. Wire Harness -

SEAT HEATER SYSTEM

Symptom Suspect Area See page
1. SEAT HTR Fuse BE-15
2. Seat Heater Switch (D, P) BE-165
Driver’s seat heater does not operate.
3. Seat Heater BE-165
4. Wire Harness -

1. SEAT HTR Fuse BE-15

2. Seat Heater Switch (D, P) BE-165
Passenger’s seat heater does not operate.
3. Seat Heater BE-165
4. Wire Harness -
Seat heater temperature is too hot. Seat Heater BE-165

AUDIO SYSTEM
Symptom Suspect Area See page
Audio system abnormal operation. TROUBLESHOOTING BE-179

CLOCK SYSTEM (in A/C Control Panel)

Symptom Suspect Area See page
Passenger seat belt warning system does not light up. TROUBLESHOOTING NO. 1 BE-210
Clock will not operate. TROUBLESHOOTING NO. 1 BE-210
Clock loses or gains time. TROUBLESHOOTING NO. 2 BE-210
ENGINE IMMOBILIZER SYSTEM
Symptom Suspect Area See page
Engine immobilizer system does not operate. See DIAGNOSIS SYSTEM DI-849

Author
: Date
: 2014

BE-14
BODY ELECTRICAL - TROUBLESHOOTING

HORN SYSTEM
Symptom Suspect Area See page
1. HORN Fuse BE-15
2. Horn Relay BE-233
Horn system does not operate. 3. Horn Switch BE-233
4. Horn BE-233
5. Wire Harness -
1. Horn Relay BE-233
Horns blow all the time. 2. Horn Switch BE-233
3. Wire Harness -
1. Horn BE-233
One horn operates but the other horn does not operate.
2. Wire Harness -

1. Horn Relay BE-233

Horns operate abnormally. 2. Horn BE-233
3. Wire Harness -
GARAGE DOOR OPENER SYSTEM
Symptom Suspect Area See page
1. Garage Door Opener BE-219
The equipment of which code has been registered does not oper-
2. Wire Harness -
ate.
3. * -
1. Garage Door Opener BE-219
LED does not light up. (Even though either switch is pressed.)
2. Wire Harness -

LED does not light up. (Only one switch is pressed.) Garage Door Opener BE-219
* As the GARAGE DOOR OPENER on the vehicle side seems to be normal, check the OPENER on the
equipment side, of which code has been registered.

Author
: Date
: 2015

 BE-15
BODY ELECTRICAL - POWER SOURCE

POWER SOURCE
BE1WP-04

LOCATION
Power Source
Engine Room Junction Block

Engine Room Relay Block

Passenger Side
Junction Block

Driver Side
Junction Block
I27323

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2016

BE-16
BODY ELECTRICAL - POWER SOURCE

Engine Room Junction Block

2 3 4 5 6 7 8 9 10 11 14 15

A
1 12 13
25 26
C 21 22 23 24
B
16 17 18 19 20
D 27 28
29
30 F G
31 E

Fuses Relays
1. MAIN FL 40A A. HEAD LP Relay
2. ECU-B1 20A B. Starter relay
3. - C. Circuit Opening Relay
4. ALT-S 7.5A D. Horn Relay
5. ETCS 15A E. EFI Relay
6. AM2 20A F. ABS MTR Relay
7. HORN 10A G. ABS SOL Relay
8. -
9. RADIO NO. 1 20A
10. TURN-HAZ 15A
11. EFI 25A
12. P/SEAT 30A
13. H-LP CLN 30A
14. SPARE
15. SPARE
16. DRL NO. 2 7.5A
17. DRL NO. 1 7.5A
18. H-LP L LWR 15A
19. H-LP R LWR 15A
20. ABS2 7.5A
21. -
22. -
23. CDS FAN 30A
24. RDI FAN 30A
25. ALT 120A
26. ABS1 60A
27. SPARE
28. SPARE
29. H-LP L UPR 10A
30. H-LP R UPR 10A
31. -

I11570

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2017

 BE-17
BODY ELECTRICAL - POWER SOURCE

Engine Room Relay Block

C
F A B E
D

Relays
A. DIMMER Relay
B. A/C COMP Relay
C. FAN NO.3 Relay
D. FAN NO.2 Relay
E. FAN NO.1 Relay
F. FUEL PMP Relay

I23236

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2018

BE-18
BODY ELECTRICAL - POWER SOURCE

Driver Side Junction Block

Fuses
1. RR DEF 40A
2. AM1 40A
3. D FR P/W 20A
4. TAIL 10A
5. GAUGE 10A
6. DOOR 20A
7. PANEL 7.5A
8. WASHER 15A
4 9. STARTER 7.5A
10. FR DEF 20A
7 11. A/C 10A
3
5 12. SEAT HTR 15A
1 2 13. CIG 15A
8 14. S/ROOF 30A
6 15. ECU-IG 10A
11 16. SRS-ACC 10A
9 17. STOP 15A
14 18. WIPER 25A
12 19. RADIO NO.2 10A
17 20. -
15
20
Condenser
18 21. DEF CDS
22. DEF CDS
19 16 13
10

Relays
A. Deicer Relay
B. TAIL Relay
C. RR DEF Relay
D. FLSH Relay

21 22

C D
B

I11547

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2019

 BE-19
BODY ELECTRICAL - POWER SOURCE

Passenger Side Junction Block

4
7 10 Fuses
1. HEATER 40A
3 2. -
5 3. DOOR DL 15A
1 2 4. DOME 7.5A
6 5. -
8 6. FR FOG 15A
7. -
9 8. P FR P/W 20A
11
9. PWR OUTLET 15A
12 10. ECU-B2 7.5A
14 11. D RR P/W 20A
12. MIR HIR 15A
17 13. MPX-B 10A
15
14. P RR P/W 20A
15. SRS-B 7.5A
16. TV 7.5A
18 20 17. -
18. OBD 7.5A
19. IGN 7.5A
13 20.-
19
16

Relays
A. FR FOG Relay
B. HTR Relay
C. MIR HTR Relay
D. P/W Relay

B
C D

I11548

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2020

BE-20 BODY ELECTRICAL - IGNITION SWITCH AND KEY UNLOCK WARNING
SWITCH

IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH

BE01L-18

LOCATION

Ignition Switch and

Key Unlock Warning Switch

I27324

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2021

 BODY ELECTRICAL - IGNITION SWITCH AND KEY UNLOCK WARNING BE-21
SWITCH
BE15W-04

INSPECTION
1. INSPECT IGNITION SWITCH CONTINUITY
Switch position Tester connection Specified condition
LOCK - No continuity
ACC 2-3 Continuity
2-3-4
ON Continuity
6-7

1-2-4
I11308 START Continuity
6-7-8

If continuity is not as specified, replace the switch.

2. INSPECT IGNITION SWITCH CIRCUIT

From Back Side Connect the switch connector and inspect the connector on
wire harness side from the back side, as shown.

I04031

Tester connection Condition Specified condition

2 - Ground Always Battery Positive Voltage
3 - Ground Ignition switch ACC or ON Battery Positive Voltage
4 - Ground Ignition switch ON Battery Positive Voltage
6 - Ground Ignition switch ON or START Battery Positive Voltage
7 - Ground Always Battery Positive Voltage
8 - Ground Ignition switch START Battery Positive Voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2022

BE-22 BODY ELECTRICAL - IGNITION SWITCH AND KEY UNLOCK WARNING
SWITCH

3. INSPECT KEY UNLOCK WARNING SWITCH CONTI-

Pin
NUITY
Switch position Tester connection Specified condition
OFF (Key removed) 1-2 No continuity
ON (Key set) 1-2 Continuity
If continuity is not as specified, replace the switch.
2 1

e-4-2-B I11309

4. INSPECT KEY UNLOCK WARNING SWITCH CIRCUIT

Wire Harness Side
(See page DI-915 )
Connect the switch connector and inspect the connector on
wire harness side from the back side, as shown.

I04032

Tester connection Condition Specified condition

1 - Ground Always Continuity
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2023

 BE-23
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

HEADLIGHT AND TAILLIGHT SYSTEM

BE29M-02

LOCATION
Engine Room Junction Block

Headlight Control Relay

H-LP LH Fuse

H-LP RH Fuse

Engine Room Relay Block

Headlight Dimmer Relay

Headlights

Automatic Light Control Sensor

Daytime Running Light Main Relay

Driver Side Junction Block

Body ECU Passenger Side

TAIL Fuse Junction Block

ECU-IG Fuse
MPX-B Fuse

Taillight Control Relay

Combination Switch

Light Control Switch

Headlight Dimmer Switch
I27325

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2024

BE-24
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

Sedan:

Headlights

w/o Rear fog light:

Taillights

Taillights

Wagon:

Headlights

w/o Rear fog light:

Taillights

Taillights

I23132

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2025

 BE-25
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM
BE29N-02

COMPONENTS

Steering Column Upper Cover

Light Control Switch and

Headlight Dimmer Switch

Steering Column Lower Cover

I15596

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2026

BE-26
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

Sedan:

Luggage Compartment Trim Luggage Compartment Trim

Side Cover LH Side Cover RH

Luggage Compartment Trim

Side Cover No. 2

Rear Combination Light

Assembly RH

Rear Combination Light Luggage Compartment Trim

Assembly LH Rear Cover

I11324

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2027

 BE-27
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

Wagon:

Deck Side Trim Board LH Deck Side Trim Board RH

Service Hole Cover

Floor Board

Deck Side Board RH

Deck Side Board LH

Rear Combination Light

Assembly RH

Back Door Scuff Plate

Rear Combination Light
Assembly LH

I23133

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2028

BE-28
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM
BE29O-02

REMOVAL
1. REMOVE HEADLIGHT
HINT:
Follow the same procedure for RH as for LH.
(a) Remove a part of LH front fender liner.
(b) Remove a part of front bumper cover.
(c) Remove the bolt, 2 nuts and 2 clips.
(d) Lift up the front bumper and pull the headlight assembly
I19103
towards the front of the vehicle, and disconnect the en-
gagement of the headlight assembly.
(e) Install LH headlight assembly.
(f) Install a part of front bumper cover.
(g) Install a part of front fender liner.
(h) Inspect and adjust optical axis of headlight
(See page BE-38 ).

I18572

2. Sedan:
REMOVE REAR COMBINATION LIGHT
HINT:

Installation is in the reverse order of removal. Only if there
is a specified procedure for installation it is shown.

Follow the same procedure for RH as for LH.
(a) Remove luggage compartment trim side cover No. 2.
(b) Remove luggage compartment trim rear cover.
I11325 (c) Remove a part of LH luggage compartment trim side cov-
er.
(d) Remove the 2 rear light covers and 2 bolts.
(e) Pull the pin toward the rear of the vehicle, and disconnect
the engagement of 2 pins.
(f) From the inside of the luggage room, separate the con-
nector and disconnect the LH rear combination light as-
sembly.

I11326

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2029

 BE-29
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

3. Wagon:
REMOVE REAR COMBINATION LIGHT
HINT:

Installation is in the reverse order of removal. Only if there
is a specified procedure for installation it is shown.

Follow the same procedure for RH as for LH.
(a) Remove floor board and deck side board LH.
(b) Remove back door scuff plate.
I23134 (c) Remove a part of deck side trim board LH.
(d) Disconnect the bulb sockets and 3 nuts.
(e) Remove the combination light assembly.

I23135

4. Sedan:
REMOVE REAR COMBINATION BULB
HINT:

Installation is in the reverse order of removal. Only if there
is a specified procedure for installation it is shown.

Follow the same procedure for RH as for LH.
(a) Remove a part of LH combination light assembly.
HINT:
I11327 Remove the light unit from only the outside of the vehicle.
(b) Remove the bulb sockets and remove the bulbs.
5. Wagon:
REMOVE REAR COMBINATION BULB
HINT:

Installation is in the reverse order of removal. Only if there
is a specified procedure for installation it is shown.

Follow the same procedure for RH as for LH.
(a) Remove a service hole cover.
(b) Remove the bulb sockets and remove the bulbs.
I23136

6. Sedan:
REMOVE REAR LAMP ASSEMBLY
HINT:

Installation is in the reverse order of removal. Only if there
is a specified procedure for installation it is shown.

Follow the same procedure for RH as for LH.
(a) Remove a part of luggage compartment door trim.
(b) Remove the nut.
I11568 (c) Compress the claw to disconnect the engagement as
shown in the illustration.
2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2030

BE-30
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

(d) Separate the connector and remove the rear light assem-
bly.

7. Wagon:
REMOVE REAR LAMP ASSEMBLY
HINT:

Installation is in the reverse order of removal. Only if there
is a specified procedure for installation it is shown.

Follow the same procedure for RH as for LH.
(a) Remove the back door trim service hole cover.
(b) Compress the claw to disconnect the engagement as
I23137 shown in the illustration.
(c) Separate the connector and remove the rear light assem-
bly.

8. Sedan:
REMOVE REAR LAMP BULB
HINT:
Installation is in the reverse order of removal. Only if there is a
specified procedure for installation it is shown.
(a) Remove a part of luggage compartment door trim.
(b) Remove the bulb socket and bulb.

I11329

9. Wagon:
REMOVE REAR LAMP BULB
HINT:
Installation is in the reverse order of removal. Only if there is a
specified procedure for installation it is shown.
(a) Remove the back door trim service hole cover.
(b) Remove the bulb socket and bulb.

I23138

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2031

 BE-31
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM
BE1WQ-04

INSPECTION
1. FAIL-SAFE FUNCTION (Light Control ECU)
When input voltage is not within the range of operation voltage (9 to 16 V),
lighting of the headlight stops. As soon as the voltage comes within the range,
When input error is inspected. it lights up again.
However if the input voltage becomes low after lighting up,
sufficient voltage is maintained until light of bulb completely goes off.
When an error occurs in the output voltage (open or short) or flushing symptom
occurs on the bulb, lighting of the headlight stops, the condition is maintained
until power is turned ON again (headlight dimmer switch OFF → ON).
When output error is inspected (Open or short). In this case, it can not be judged whether lighting malfunction is caused by an
When light flushing is inspected. output error or other reasons (fuse blown out, etc.).
Check that there is no error in fuse and wiring (including power source) and
replace the bulb in the first place, when the error still appears, replace the light
control ECU.

2. INSPECT LIGHT CONTROL SWITCH CONTINUITY

Switch position Tester connection Specified condition
OFF - No continuity
TAIL 14 - 16 Continuity
HEAD 13 - 14 - 16 Continuity
AUTO 13 - 16 Continuity
If continuity is not as specified, replace the switch.
3. INSPECT HEADLIGHT DIMMER SWITCH CONTINU-
I11537
ITY
Switch position Tester connection Specified condition
Low beam 16 - 17 Continuity
High beam 7 - 16 Continuity
Flash 7 - 8 - 16 Continuity
If continuity is not as specified, replace the switch.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2032

BE-32
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

4. Connector disconnected:
Wire Harness Side
INSPECT LIGHT CONTROL SWITCH CIRCUIT(See
page DI-802 )
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.

I11538

Tester connection Condition Specified condition

16 - Ground Always Continuity

If circuit is not as specified, inspect the wire harness.

5. Connector disconnected:
Wire Harness Side
INSPECT HEADLIGHT DIMMER SWITCH CIRCUIT
(See page DI-802 )
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.

I11538

Tester connection Condition Specified condition

16 - Ground Always Continuity
13 - Ground Light control switch HEAD Battery Positive Voltage
If circuit is not as specified, inspect the wire harness.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2033

 BE-33
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

From Back Side 6. Connector connected:

INSPECT LIGHT CONTROL SWITCH CIRCUIT
Connect the wire harness side connector to the light control and
dimmer switch and inspect the connector from the back side, as
shown.

I11540

Tester connection Condition Specified condition

12 - Ground Light control switch OFF, TAIL or HEAD Battery Positive Voltage
12 - Ground Light control switch AUTO No voltage
13 - Ground Light control switch OFF or TAIL Battery Positive Voltage
13 - Ground Light control switch HEAD No voltage
14 - Ground Light control switch OFF Battery Positive Voltage
14 - Ground Light control switch TAIL or HEAD No voltage
If circuit is not as specified, inspect the wire harness.

From Back Side 7. Connector connected:

INSPECT HEADLIGHT DIMMER SWITCH CIRCUIT
Connect the wire harness side connector to the light control and
dimmer switch and inspect the connector from the back side, as
shown.

I11540

Tester connection Condition Specified condition

Headlight dimmer switch FLASH
7 - Ground Light control switch HEAD and dimmer switch No voltage
HIGH
Light control switch HEAD and
7 - Ground Battery Positive Voltage
dimmer switch LOW
Light control switch HEAD and
17 - Ground No voltage
dimmer switch LOW and fog light switch ON

Light control switch HEAD and

17 - Ground dimmer switch HIGH or FLASH and fog light Battery Positive Voltage
switch ON
If circuit is not as specified, inspect the wire harness.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2034

BE-34
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

8. INSPECT HEADLIGHT CONTROL RELAY CONTINU-

ITY
2 1
Condition Tester connection Specified condition
2 1 Always 1-2 Continuity
Apply B+ between
4 3 3-4 Continuity
terminals 1 and 2.

4 3
If continuity is not as specified, replace the relay.
9. INSPECT HEADLIGHT CONTROL RELAY CIRCUIT
I01259
(See page DI-805 )

10. INSPECT HEADLIGHT DIMMER ( DAYTIME RUNNING

LIGHT NO. 2) RELAY CONTINUITY
2 1
Condition Tester connection Specified condition
2 1 Always 1-2 Continuity
Apply B+ between
4 3 3-4 Continuity
terminals 1 and 2.

4 3
If continuity is not as specified, replace the relay.

I01259

11. INSPECT TAILLIGHT CONTROL RELAY CONTINUITY

1 2
Condition Tester connection Specified condition
Always 1-2 Continuity
3 5
Apply B+ between
5 3-5 Continuity
terminals 1 and 2.
1 2
If continuity is not as specified, replace the relay.
12. INSPECT TAILLIGHT CONTROL RELAY CIRCUIT (See
3 page DI-913 )
I01200

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2035

 BE-35
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

13. INSPECT DAYTIME RUNNING LIGHT MAIN RELAY

Wire Harness Side
CIRCUIT
Disconnect the connector from the relay and inspect the con-
nector on the wire harness side.

h-10-1-A I01326

Tester connection Condition Specified condition

2 - Ground Light control switch OFF No continuity
2 - Ground Light control switch TAIL or HEAD Continuity
4 - Ground Light control switch OFF or TAIL No continuity
4 - Ground Light control switch HEAD Continuity
6 - Ground Headlight dimmer switch FLASH Continuity
8 - Ground Engine running Battery Positive Voltage
7 - Ground Always Continuity
10 - Ground Always Continuity
13 - Ground Headlight dimmer switch FLASH or HI Continuity
12 - Ground Always Battery Positive Voltage
1 - Ground Ignition switch OFF No voltage
1 - Ground Ignition switch ON Battery Positive Voltage
9 - Ground Terminal 3 ground Battery Positive Voltage
11 - Ground Rear fog light switch ON, terminal 3 ground Battery Positive Voltage
5 - Ground Always Battery Positive Voltage
14 - Ground Terminal 5 ground Battery Positive Voltage
If circuit is specified, try replacing the relay with a new one.
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

14. Auto on function:

INSPECT AUTOMATIC LIGHT CONTROL SYSTEM
(a) Turn the ignition switch ON.
(b) Turn the light control switch to AUTO.
(c) Gradually cover the top of the sensor.
(d) Check the accessory lights and the headlights should turn
ON.

I11559

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2036

BE-36
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

15. Auto off function:

INSPECT AUTOMATIC LIGHT CONTROL SYSTEM
(a) Gradually expose the sensor.
(b) Check the headlights and the accessory lights should turn
OFF.

I11558

16. INSPECT LIGHT-OFF CONDITION

(a) Turn the ignition switch ON.
(b) Gradually cover the top of the sensor.
Lights auto ON:
(c) Check that the lights go off under the following conditions.
(1) Light control switch is OFF.
(2) The area surrounding the sensor gets bright.
(3) The driver’s door is opened with the ignition switch
OFF.
17. INSPECT LIGHTS-ON CONDITION
(a) Open the driver’s door while the ignition switch is OFF.
(b) Turn the light control switch to AUTO leaving the door
open and cover the top of the sensor, and verify that the
lights go on when the ignition switch is turned ON.

18. Connector disconnected:

Wire Harness Side
INSPECT AUTOMATIC LIGHT CONTROL SENSOR
CIRCUIT
Disconnect the connector from the sensor and inspect the con-
nector on the wire harness side, as shown in the table.
1234

I01254

Tester connection Condition Specified condition

3 - Ground Always Continuity
1 - Ground Ignition switch LOCK or ACC No voltage
1 - Ground Ignition switch ON Battery Positive Voltage
4 - Ground Ignition switch LOCK or ACC No voltage
4 - Ground Ignition switch ON 5.2 - 9.0 V
If circuit is as specified, perform the inspection on the following
page.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2037

 BE-37
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

If the circuit is not as specified, inspect the circuit connected to

other parts.

From Back Side 19. Connector connected:

4 1 INSPECT AUTOMATIC LIGHT CONTROL SENSOR
CIRCUIT
Connect the wire harness side connector to the sensor and in-
spect wire harness side connector from the back side, as
shown.
HINT:
3 2
Ignition switch ON.
I01255
Light control switch AUTO.

Vehicle’s surroundings are bright.

Tester connection Condition Specified condition

3 - Ground Always Continuity
1 - Ground Ignition switch LOCK or ACC No voltage
1 - Ground Ignition switch ON 9.5 V or more
Vehicle is under the direct sun light.
Taillight and Headlight are ON.
(Sensor is not covered)

If circuit is as specified, try replacing the sensor with a new one.

If the circuit is not as specified, inspect the circuit connected to
other parts.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2038

BE-38
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM
BE160-04

ADJUSTMENT

Adjusting Bolt A
(Low-Beam Headlight
Vertical Direction)
Adjusting Bolt
(High-Beam Headlight
Vertical Direction)

Light Control ECU

Headlight Beam Level Control Actuator

I17084

NOTICE:

Disconnect the connector of the other light to avoid heat affection from the light because the
outer lens of the head light assembly is made of synthetic resin. When connecting the connec-
tor again take care not to wake the aiming out of adjustment.

When covering the headlight, finish it within 3 minutes.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2039

 BE-39
BODY ELECTRICAL - HEADLIGHT AND TAILLIGHT SYSTEM

ADJUSTING HEADLIGHT AIM

(a) Put the vehicle in below conditions.

Make sure the body around the headlight is not de-
(5) 0.4 ° formed.
H line
Park the vehicle on a level spot.
H

Tire inflation pressure is the specified value.
(8)

Height control operation completes.
0.823 in 9.84ft
Tire inflation pressure is the specified value.
(20.9 mm) (3.0 M)

The driver gets into the driver’s seat and puts the
50.2in vehicle in a state ready for driving (with a full tank).
(1,275 mm)

Bounce the vehicle several times.
V(RH)
(b) Check the headlight aiming.
90° V(Center)
(1) Prepare the thick white colored paper.
(2) Stand the paper perpendicularly and ensure the
V(LH)
distance from it to the head lights is 9.84 ft.
(3) Ensure that the center line of vehicle and the paper
are at a 90 degree angle as shown in the illustration.
(4) Engine running.
Low Beam: (7) (6) (7)
V(LH) V(Center) V(RH) (5) Draw a horizontal line (H line) on the paper where
the head lights of the vehicle are to be.
(6) Draw a vertical line on the paper where the center
H line
line of the vehicle is to be. (V line)
(5)
0.823 in
(7) Draw the vertical lines on the paper where the head-
50.2in
(20.9 mm)
(1,275 mm)
lights (low-beam and high-beam center marks) of
the vehicle are to be (V RH and V LH lines).
High Beam: (7) (6) (7)
(8) Draw the vertical lines on the paper where the head-
V(LH) V(Center) V(RH) lights (low beam center marks) of the vehicle are to
0.4 in
be. (V RH and LH lines)
0 in H line (9) Turn the head lights ON.
(5) (10) Check that the head lights light up the paper as
0.4 in
shown in the illustration.
50.2in (11) When the paper is not lighted up properly, adjust the
(1,275 mm)
( ) : Procedure steps lights in the vertical direction.
I18592 HINT:
As shown in the illustration, adjust aiming of the LH and RH
lights respectively.
(c) Adjust the headlight in vertical direction.
Using adjusting bolt A, adjust the headlight aim to within
the specifications.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2040

BE-40
BODY ELECTRICAL - HEADLIGHT BEAM LEVEL CONTROL SYSTEM

HEADLIGHT BEAM LEVEL CONTROL SYSTEM

BE29P-02

LOCATION

Engine Room
Junction Block Headlight Assembly

PWR-IG Fuse
Headlight Beam Level
Control Actuator

Headlight Beam Control ECU

Headlight Beam Level Ignition Switch

Control ECU

I27327

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2041

 BE-41
BODY ELECTRICAL - HEADLIGHT BEAM LEVEL CONTROL SYSTEM

Sedan:

Height Control Sensor

Wagon:

Height Control Sensor

I27326

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2042

BE-42
BODY ELECTRICAL - HEADLIGHT BEAM LEVEL CONTROL SYSTEM
BE0BI-04

INSPECTION
6 1. INSPECT HEADLIGHT BEAM LEVEL CONTROL AC-
3 TUATOR RESISTANCE
5 (a) Check that continuity exists between terminal 2 and 5.
2 (b) Check that resistance exists between terminal, as shown
in the chart.
1
Terminal Resistance (Ω)
4
2-1 26 - 30
I03440
2-3 26 - 30
2-4 26 - 30
2-6 26 - 30
5-1 26 - 30
5-3 26 - 30
5-4 26 - 30
5-6 26 - 30

If resistance value is not as specified, replace the actuator.

Wire Harness Side 2. Connector disconnected:

INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU
CIRCUIT
Disconnect the connector from the ECU and inspect the con-
nector on the wire harness side, as shown.

I11468

Tester connection Condition Specified condition

1 - 13 Ignition switch OFF 26 - 30 Ω
1 - 15 Ignition switch OFF 26 - 30 Ω
1 - 14 Ignition switch OFF 26 - 30 Ω
1 - 16 Ignition switch OFF 26 - 30 Ω
1-4 Ignition switch OFF 26 - 30 Ω
1-2 Ignition switch OFF 26 - 30 Ω
1 - 12 Ignition switch OFF 26 - 30 Ω
1-3 Ignition switch OFF 26 - 30 Ω
6 - 10 Ignition switch OFF Continuity
7 - 11 Ignition switch OFF Continuity
10 - 17 Ignition switch OFF Continuity
5 - 11 Ignition switch OFF Continuity
20 - Ground Ignition switch OFF Continuity
If circuit is not as specified, perform the inspection on the follow-
ing page.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2043

 BE-43
BODY ELECTRICAL - HEADLIGHT BEAM LEVEL CONTROL SYSTEM

From Back Side 3. Connector connected:

INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU
CIRCUIT
Connect the connector from the ECU and inspect the connector
on the back side, as shown in the chart.

I15599

Tester connection Condition Specified condition

1 - 20 Ignition switch ON Battery positive voltage
Ignition switch ON, when keep and bounce the
13 - 20 *1 Pulse generation
vehicle

Ignition switch ON, when keep and bounce the

15 - 20 *1 Pulse generation
vehicle

Ignition switch ON, when keep and bounce the

14 - 20 *1 Pulse generation
vehicle
Ignition switch ON, when keep and bounce the
16 - 20 *1 Pulse generation
vehicle

10 - 17 Ignition switch ON Approx. 2.5 V

18 - 20 Ignition switch ON No continuity
Ignition switch ON, when keep and bounce the
4 - 20 *1 Pulse generation
vehicle
Ignition switch ON, when keep and bounce the
2 - 20 *1 Pulse generation
vehicle

Ignition switch ON, when keep and bounce the

12 - 20 *1 Pulse generation
vehicle

Ignition switch ON, when keep and bounce the

3 - 20 *1 Pulse generation
vehicle

5 - 11 Ignition switch ON Approx. 2.5 V

11 - 20 Ignition switch OFF Continuity
10 - 17 Ignition switch OFF Continuity
6 - 10 Ignition switch ON 5V
7 - 11 Ignition switch ON 5V
10 - 20 Ignition switch OFF Continuity
20 - Body ground Ignition switch OFF Continuity
If the circuit is not as specified, replace the ECU.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2044

BE-44
BODY ELECTRICAL - HEADLIGHT BEAM LEVEL CONTROL SYSTEM

Reference INSPECTION USING OSCILLOSCOPE

HINT:
The correct waveform is as shown in the illustration.

*1 Pulse generation *2 Pulse generation

Motor operating Motor operating

5V 5V
/ Division / Division

GND GND

10 m sec./ Division 10 m sec./ Division

I03276

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2045

 BE-45
BODY ELECTRICAL - FOG LIGHT SYSTEM

FOG LIGHT SYSTEM

BE29Q-02

LOCATION
Sedan:

Wagon:

Front Fog Lights

Rear Fog Light Switch

Front Fog Lights

Passenger Side
Junction Block

Front Fog Light Relay

FR Fog Fuse

Combination Switch

Front Fog Light Switch
I27803

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2046

BE-46
BODY ELECTRICAL - FOG LIGHT SYSTEM

Sedan:

Rear Fog Light

Wagon:

Rear Fog Light

I27804

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2047

 BE-47
BODY ELECTRICAL - FOG LIGHT SYSTEM
BE29R-02

REMOVAL
1. Sedan:
REMOVE FRONT FOG LIGHT ASSEMBLY
HINT:

Installation is in the reverse order of removal. Only if there
is a specified procedure for installation it is shown.

Follow the same procedure for RH as for LH.
(a) Remove the front portion of fender liner.
I11320
(b) Disconnect the connecter.
(c) Remove the 2 bolts.
(d) Remove the front fog light assembly, as shown in the il-
lustration.
(e) Install front fog light assembly.
(f) Adjust optical axis of fog light (See page BE-50 ).

2. Wagon:
REMOVE FRONT FOG LIGHT ASSEMBLY
HINT:

Installation is in the reverse order of removal. Only if there
is a specified procedure for installation it is shown.

Follow the same procedure for RH as for LH.
(a) Remove the front portion of fender liner.
(b) Disconnect the connecter.
I23141 (c) Remove the 2 bolts.
(d) Remove the front fog light assembly, as shown in the il-
lustration.
(e) Install front fog light assembly.
(f) Adjust optical axis of fog light (See page BE-50 ).

3. REMOVE FRONT FOG LIGHT BULB

HINT:
Follow the same procedure for RH as for LH.
(a) Remove a part of LH front fender liner.
(b) Separate the connector and remove the bulb.

I11321

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2048

BE-48
BODY ELECTRICAL - FOG LIGHT SYSTEM
BE29S-03

INSPECTION
1. INSPECT FRONT FOG LIGHT SWITCH CONTINUITY
Switch position Tester connection Specified condition
OFF - No continuity
ON 10 - 11 Continuity
If continuity is not as specified, replace the switch.

I11537

Wire Harness Side

2. Connector disconnected:
INSPECT FRONT FOG LIGHT SWITCH CIRCUIT
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.

I11538

Tester connection Condition Specified condition

10 - 17 Always Continuity
If circuit is not as specified, inspect the wire harness.

From Back Side 3. Connector connected:

INSPECT FRONT FOG LIGHT SWITCH CIRCUIT
Connect the wire harness side connector to the light control and
dimmer switch and inspect the connector from the back side, as
shown.

I11540

Tester connection Condition Specified condition

Light control switch HEAD and headlight dimmer
11 - Ground No voltage
switch LO and fog light switch ON
Light control switch HEAD and headlight dimmer
11 - Ground Battery Positive Voltage
switch LO and fog light switch OFF

If circuit is not as specified, inspect the wire harness.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2049

 BE-49
BODY ELECTRICAL - FOG LIGHT SYSTEM

4. INSPECT REAR FOG LIGHT SWITCH CIRCUIT

Wire Harness Side
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.

I11315

Tester connection Condition Specified condition

1 - Ground Always * Continuity
2 - Ground Light control switch TAIL or HEAD Continuity
3 - Ground Always Battery voltage
5 - Ground Light control switch HEAD Continuity
7 - Ground Always Continuity
8 - Ground Always Continuity
*: There is resistance because this circuit is ground through the
bulb.
If the circuit is not as specified, replace the wire harness.

5. INSPECT FRONT FOG LIGHT RELAY CONTINUITY

1 2
Condition Tester connection Specified condition
Always 1-2 Continuity
3 5
Apply B+ between
3-5 Continuity
5 terminals 1 and 2.
1 2
If continuity is not as specified, replace the relay.

3
I01200

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2050

BE-50
BODY ELECTRICAL - FOG LIGHT SYSTEM
BE164-05

ADJUSTMENT
ADJUST FRONT FOG LIGHT AIM
A-bolt: Vertical Direction
HINT:
Insert a driver into the hole for aiming in the fender liner to per-
form aiming.

I11317

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2051

 BE-51
BODY ELECTRICAL - TURN SIGNAL AND HAZARD WARNING SYSTEM

TURN SIGNAL AND HAZARD WARNING SYSTEM

BE29T-02

LOCATION

Engine Room Junction Block

TURN & HAZ Fuse

Turn Signal Lights

Hazard Warning Switch

Driver Side Junction Block

Turn Signal Flasher

Combination Switch

Turn Signal Switch
I27807

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2052

BE-52
BODY ELECTRICAL - TURN SIGNAL AND HAZARD WARNING SYSTEM

Sedan:
Turn Signal Lights

Side Marker Lights

Turn Signal Lights

Wagon:
Turn Signal Lights

Side Marker Lights

Turn Signal Lights

I27808

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2053

 BE-53
BODY ELECTRICAL - TURN SIGNAL AND HAZARD WARNING SYSTEM
BE1WS-03

INSPECTION
1. INSPECT TURN SIGNAL SWITCH CONTINUITY
Switch position Tester connection Specified condition
Left turn 1-2 Continuity
Neutral - No continuity
Right turn 2-3 Continuity

If continuity is not as specified, replace the switch.

I11537

Wire Harness Side

2. Connector disconnected:
INSPECT TURN SIGNAL SWITCH CIRCUIT
Disconnect the connector from the combination switch and in-
spect the connector on the wire harness side, as shown.

I11538

Tester connection Condition Specified condition

2 - Ground Always Continuity
If circuit is not as specified, inspect the wire harness.

From Back Side 3. Connector connected:

INSPECT TURN SIGNAL SWITCH CIRCUIT
Connect the wire harness side connector to the combination
switch and inspect the connector form the back side, as shown.

I11540

Tester connection Condition Specified condition

2 - Ground Ignition switch ON and turn signal switch Neutral No voltage
1 - Ground Ignition switch ON and turn signal switch Left Battery Positive Voltage ↔ 0 V
3 - Ground Ignition switch ON and turn signal switch Right Battery Positive Voltage ↔ 0 V
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2054

BE-54
BODY ELECTRICAL - INTERIOR LIGHT SYSTEM

INTERIOR LIGHT SYSTEM

BE29U-02

LOCATION
Glove Compartment Door Courtesy Switch

Driver Side Junction Block

Body ECU

ECU-IG Fuse

Passenger Side Junction Block

DOME Fuse

MPX-B Fuse

Front Personal Light

Vanity Light
Sedan:
Room Light
Vanity Light

License Plate Light

Door Courtesy Light

Door Courtesy Switches

Luggage Compartment
Luggage Compartment Light Door Lock Assembly

Courtesy Switch
I27805

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2055

 BE-55
BODY ELECTRICAL - INTERIOR LIGHT SYSTEM

Wagon:

Front Personal Light

Vanity Light

Room Light
Vanity Light

License Plate Light

Door Courtesy Light

Door Courtesy Switches

Back Door Lock Assembly

Courtesy Switch
Rear Room Light

I27806

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2056

BE-56
BODY ELECTRICAL - INTERIOR LIGHT SYSTEM
BE29V-02

REMOVAL
1. Sedan:
REMOVE LICENSE PLATE LIGHT
HINT:

Installation is in the reverse order of removal. Only if there
is a specified procedure for installation it is shown.

Follow the same procedure for RH as for LH.
(a) Remove the Internal Trunk Release Handle.
I18573
(b) Remove a part of luggage compartment door trim.
(c) Remove the 4 nuts.
(d) Remove luggage compartment door outer garnish.
(e) Disconnect the connector.
(f) Pull the claw towards the inside of the vehicle as shown
in the illustration, disconnect the engagement of 2 claws,
and remove the license plate light assembly.

I11331

2. Wagon:
REMOVE LICENSE PLATE LIGHT
HINT:

Installation is in the reverse order of removal. Only if there
is a specified procedure for installation it is shown.

Follow the same procedure for RH as for LH.
(a) Remove the back door trim.
(b) Remove the 4 nuts.
I23198 (c) Remove back door outer garnish.
(d) Disconnect the connector.
(e) Pull the claw towards the inside of the vehicle as shown
in the illustration, disconnect the engagement of 2 claws,
and remove the license plate light assembly.

I23199

3. Sedan:
REMOVE LICENSE PLATE BULB
HINT:
Installation is in the reverse order of removal. Only if there is a
specified procedure for installation it is shown.
(a) Remove a part of luggage compartment door trim.
(b) Disconnect the bulb sockets and remove the bulbs.

I11332

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2057

 BE-57
BODY ELECTRICAL - INTERIOR LIGHT SYSTEM

4. Wagon:
REMOVE LICENSE PLATE BULB
HINT:
Installation is in the reverse order of removal. Only if there is a
specified procedure for installation it is shown.
(a) Remove the back door trim.
(b) Disconnect the bulb sockets and remove the bulbs.

I23200

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2058

BE-58
BODY ELECTRICAL - INTERIOR LIGHT SYSTEM
BE29W-03

INSPECTION
1. w/ Sliding Roof:
INSPECT FRONT PERSONAL LIGHT SWITCH CONTI-
NUITY
Switch position Tester connection Specified condition
3 2 1 OFF - No continuity
6 5 4 ON 1-4 Continuity

I01262
If continuity is not as specified, replace the light assembly or
bulb.
2. w/o Sliding Roof:
INSPECT FRONT PERSONAL LIGHT SWITCH CONTI-
NUITY
Switch position Tester connection Specified condition
1
OFF - No continuity
2 ON 1-2 Continuity

If continuity is not as specified, replace the light assembly or

bulb.
I11803
3. INSPECT FRONT PERSONAL LIGHT SWITCH CIR-
CUIT (See page DI-907 )

4. w/o Reader sensor:

2
INSPECT ROOM LIGHT CONTINUITY
(a) Disconnect the connector from the room light.
(b) Turn the room light switch ON, check that continuity exists
between terminal 2 and body ground.

I01263

(c) Turn the room light switch DOOR, check that continuity
2
exists between terminals 1 and 2.
If continuity is not as specified, replace the light assembly or
bulb.

I01264

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2059

 BE-59
BODY ELECTRICAL - INTERIOR LIGHT SYSTEM

5. w/ Reader sensor:
INSPECT ROOM LIGHT CONTINUITY
(a) Disconnect the connector from the room light.
(b) Turn the room light switch ON, check that continuity exists
between terminal 2 and 3.

3
2
I23191

(c) Turn the room light switch DOOR, check that continuity
exists between terminals 1 and 3.
If continuity is not as specified, replace the light assembly or
bulb.

3
1
I23192

6. INSPECT FRONT DOOR COURTESY SWITCH CONTI-

ON
NUITY
OFF (a) Check that continuity exists between terminals and the
switch body with the switch ON (switch pin released:
opened door).
(b) Check that no continuity exists between terminals and the
switch body with the switch OFF (switch pin pushed in:
closed door).
I01265 If operation is not as specified, replace the switch.

7. INSPECT REAR DOOR COURTESY SWITCH CONTI-

ON NUITY
(a) Check that continuity exists between terminals and the
switch body with the switch ON (switch pin released:
opened door).
OFF (b) Check that no continuity exists between terminals and the
switch body with the switch OFF (switch pin pushed in:
closed door).
I01266 If operation is not as specified, replace the switch.

ON 8. INSPECT LUGGAGE COMPARTMENT DOOR COUR-

TESY SWITCH CONTINUITY
(a) Check that continuity exists between terminals and the
OFF
switch body with the switch ON (switch pin released:
opened door).
(b) Check that no continuity exists between terminals and the
switch body with the switch OFF (switch pin pushed in:
closed door).
I01267 If operation is not as specified, replace the switch.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2060

BE-60
BODY ELECTRICAL - INTERIOR LIGHT SYSTEM

9. INSPECT LUGGAGE COMPARTMENT LIGHT CONTI-

NUITY
Using the ohmmeter, check that continuity exists between ter-
minals.
If continuity is not as specified, replace the light assembly or
2 1
bulb.

e-2-2-J I01268

10. REAR ROOM LIGHT SWITCH CONTINUITY

Switch position Tester connection Specified condition

1 OFF 1-2 No continuity

ON 2-3 Continuity
2
If continuity is not as specified, replace the light assembly or
3 bulb.

I23190

11. INSPECT VANITY LIGHT CONTINUITY

Switch position Tester connection Specified condition
OFF (closed) - No continuity
ON
ON (opened) 1-2 Continuity
2 1
If continuity is not as specified, replace the vanity light assembly
OFF or bulb.

I04050

12. INSPECT VANITY LIGHT CIRCUIT

Wire Harness Side
(See page DI-907 )
Disconnect the connector from the light and inspect the con-
nector on the wire harness side, as shown.

I04051

Tester connection Condition Specified condition

2 - Ground Always Continuity
1 - Ground Always Battery Positive Voltage

If circuit is not as specified, inspect power source or wire har-

ness.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2061

 BE-61
BODY ELECTRICAL - INTERIOR LIGHT SYSTEM

13. INSPECT DOOR COURTESY LIGHT CONTINUITY

Using an ohmmeter, check that continuity exists between termi-
nals.
If continuity is not as specified, replace the light assembly or
2 1 bulb.

e-2-2-J I04052

14. INSPECT DOOR COURTESY LIGHT CIRCUIT

Wire Harness Side
(See page DI-907 )

I04053

15. INSPECT LUGGAGE COMPARTMENT DOOR COUR-

TESY SWITCH CONTINUITY
Switch position Tester connection Specified condition
OFF (closed) - No continuity
ON (opened) 2 - Switch body Continuity
2 1 If continuity is not as specified, replace the switch.

I04054

16. BACK DOOR COURTESY SWITCH CONTINUITY

3
Switch position Tester connection Specified condition
OFF (closed) - No continuity
4 ON (opened) 3-4 Continuity

If continuity is not as specified, replace the switch.

I23197

17. INSPECT LUGGAGE COMPARTMENT DOOR COUR-

Wire Harness Side
TESY SWITCH CIRCUIT
(See page DI-923 )
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.

I04185

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2062

BE-62
BODY ELECTRICAL - INTERIOR LIGHT SYSTEM

Tester connection Condition Specified condition

Luggage compartment door courtesy switch ON
2 - Body ground Continuity
(door opened)

If circuit is not as specified, inspect power source or wire har-

ness.

18. INSPECT LICENSE PLATE LIGHT CONTINUITY

Using an ohmmeter, check that continuity exists between termi-
nals.
If continuity is not as specified, replace the light assembly or
bulb.

e-2-2-J I04060

19. INSPECT LICENSE PLATE LIGHT CIRCUIT

Wire Harness Side
Disconnect the connector from the light and inspect the con-
nector on the wire harness side, as shown.

I04053

Tester connection Condition Specified condition

1 - Ground Always Continuity
2 - Ground Light control switch TAIL or HEAD Battery Positive Voltage
If circuit is not as specified, inspect power source or wire har-
ness.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2063

 BE-63
BODY ELECTRICAL - BACK-UP LIGHT SYSTEM

BACK-UP LIGHT SYSTEM

BE29X-03

LOCATION

Back-up Light (M/T)

Park/Neutral Position Switch (A/T)

Ignition Switch

I27809

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2064

BE-64
BODY ELECTRICAL - BACK-UP LIGHT SYSTEM

Sedan:

Back-up Lights

Wagon:

Back-up Lights

I27810

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2065

 BE-65
BODY ELECTRICAL - BACK-UP LIGHT SYSTEM
BE169-05

INSPECTION
1. INSPECT BACK- UP LIGHT SWITCH CONTINUITY
(M/T)
Switch position Specified condition
Push Continuity
Free No continuity
Push
If continuity is not as specified, replace the switch.
Free I01269
2. INSPECT PARK/NEUTRAL POSITION SWITCH CON-
TINUITY (A/T)
(See page DI-371 )

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2066

BE-66
BODY ELECTRICAL - STOP LIGHT SYSTEM

STOP LIGHT SYSTEM

BE0H6-14

LOCATION
Stop Light Switch

Driver Side Junction Block

STOP Fuse

w/ Spoiler:
Hi-Mounted Stop Light
w/o Spoiler:
Hi-Mounted Stop Light

Sedan:

Hi-Mounted Stop Light

Wagon:
w/o Rear fog light:
Stop Lights
Stop Lights

Stop Lights
I27811

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2067

 BE-67
BODY ELECTRICAL - STOP LIGHT SYSTEM
BE16A-04

REMOVAL
1. w/o Spoiler:
REMOVE HI-MOUNTED STOP LIGHT ASSEMBLY
HINT:
Installation is in the reverse order of removal. Only if there is a
specified procedure for installation it is shown.
(a) Insert the clip remover in the position as shown in the il-
lustration, pull it upwards, and disconnect the engage-
I11567
ment of the 2 front claws.
(b) Pull the center stop light assembly in the direction as
shown in the illustration, and disconnect the engagement
of 4 claws.
(c) Separate the connector, and remove the center stop light
assembly.

I11334

2. w/o Spoiler:
REMOVE HI-MOUNTED STOP LIGHT BULB
HINT:
Installation is in the reverse order of removal. Only if there is a
specified procedure for installation it is shown.
(a) Remove center stop light assembly.
(b) Remove the bulb sockets and bulbs.

I11335

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2068

BE-68
BODY ELECTRICAL - STOP LIGHT SYSTEM
BE29Y-03

INSPECTION
2 1 1. INSPECT STOP LIGHT SWITCH CONTINUITY
Switch position Tester connection Specified condition
Switch pin pushed in
1-2 Continuity
(Pedal released)

Switch pin free

Pushed in Free 4 3 (Pedal depressed)
1-2 No continuity

Switch pin free

I04062 3-4 Continuity
(Pedal depressed)

Switch pin pushed in

3-4 No continuity
(Pedal released)

If continuity is not as specified, replace the switch.

2. w/ Spoiler:
INSPECT HI- MOUNTED STOP LIGHT ASSEMBLY
CONTINUITY
Using the ohmmeter, check that continuity exists between ter-
minals.
If continuity is not as specified, replace the bulb or light assem-
bly.

I08176

Wire Harness Side 3. INSPECT STOP LIGHT SWITCH CIRCUIT

(See page DI-830 )
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.

I04063

Tester connection Condition Specified condition

2 - Ground Always Battery Positive Voltage
If circuit is not as specified, inspect the power source or wire
harness.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2069

 BE-69
BODY ELECTRICAL - HEADLIGHT CLEANER SYSTEM

HEADLIGHT CLEANER SYSTEM

BE023-13

LOCATION

Headlight
Cleaner Relay

Headlight Cleaner Nozzle

Headlight Cleaner Nozzle
Washer Tank

Headlight Cleaner Motor

Headlight Cleaner Switch

Ignition Switch
Driver Side Junction Block

H-CLN Fuse
I27812

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2070

BE-70
BODY ELECTRICAL - HEADLIGHT CLEANER SYSTEM
BE0HM-07

INSPECTION
1. INSPECT HEADLIGHT CLEANER SWITCH CONTINU-
ITY
Switch position Tester connection Specified condition
4 3 2 1 OFF - No continuity
ON 1-4 Continuity
Illumination circuit 2-3 Continuity

I01686 If continuity is not as specified, replace the switch.

2. INSPECT HEADLIGHT CLEANER SWITCH CIRCUIT

Wire Harness Side
Disconnect the switch connector and inspect the connector on
wire harness side, as shown.

e-6-1
I10746

Tester connection Condition Specified condition

1 - Ground Headlight ON Continuity
1 - Ground Headlight OFF No continuity
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

3
3. INSPECT HEADLIGHT CLEANER RELAY OPERATION
2 (a) Check that no continuity exists between terminals 2 and
1
5.
4 (b) Connect the positive (+) lead from the battery to terminals
1 and 5, and the negative (-) lead to terminal 3.
5 (c) Connect the negative (-) lead from the battery to terminal
4, and check that continuity exists between terminals 2
and 5 for 0.9 - 1.1 seconds, then no continuity exists.
I01687 If operation is not as specified, replace the motor.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2071

 BE-71
BODY ELECTRICAL - HEADLIGHT CLEANER SYSTEM

Wire Harness Side

4. INSPECT HEADLIGHT CLEANER RELAY CIRCUIT
Disconnect the connector from the relay and inspect the con-
nector on wire harness side, as shown.

I04067

Tester connection Condition Specified condition

2 - Ground
Always Continuity
3 - Ground

Ignition switch ON, light control switch in HEAD

4 - Ground No continuity
and cleaner switch OFF

Ignition switch ON, light control switch in HEAD

4 - Ground and cleaner switch ON or daytime running light Continuity
system operating
1 - Ground Ignition switch OFF or ACC No voltage
1 - Ground Ignition switch ON Battery voltage
5 - Ground Always Battery voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

5. INSPECT HEADLIGHT CLEANER MOTOR OPERA-

1 TION
Connect the positive (+) lead from the battery to terminal 2 and
the negative (-) lead to terminal 1, check that the motor oper-
ates.
NOTICE:
2 These tests must be performed quickly (within 20 seconds) to
prevent the coil from burning out.
I04068 If operation is not as specified, replace the motor.

6. INSPECT HEADLIGHT CLEANER MOTOR CIRCUIT

Wire Harness Side
Disconnect the connector from the cleaner motor and inspect
the connector on wire harness side, as shown.

I04069

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2072

BE-72
BODY ELECTRICAL - HEADLIGHT CLEANER SYSTEM

Tester connection Condition Specified condition

2 - Ground Always Continuity
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2073

 BE-73
BODY ELECTRICAL - WIPER AND WASHER SYSTEM

WIPER AND WASHER SYSTEM

BE29Z-04

LOCATION

Front Wiper Motor

Washer Tank

Washer Motor
Combination Switch

Wiper and Washer Switch

Ignition Switch
Driver Side Junction Block

WIPER Fuse

WASHER Fuse
I27813

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2074

BE-74
BODY ELECTRICAL - WIPER AND WASHER SYSTEM

Wagon:

Rear Wiper Motor

I27814

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2075

 BE-75
BODY ELECTRICAL - WIPER AND WASHER SYSTEM
BE2MV-02

Wiper and Washer Switch Side INSPECTION

1. INSPECT FRONT WIPER AND WASHER SWITCH
CONTINUITY
Switch position Tester connection Specified condition
OFF 7 - 16 Continuity
INT 7 - 16 Continuity
LO 7 - 17 Continuity

I18569 HI 8 - 17 Continuity
Washer OFF - No continuity
Washer ON 2 - 11 Continuity
If continuity is not as specified, replace the switch.
2. INSPECT REAR WIPER AND WASHER SWITCH CON-
TINUITY
Switch position Tester connection Specified condition
OFF - Continuity
INT 2 - 13 Continuity
ON 2 - 10 Continuity
Washer OFF - No continuity
Washer ON 2 - 12 Continuity
If continuity is not as specified, replace the switch.

3. Connector disconnected:
Wire Harness Side
INSPECT WIPER AND WASHER SWITCH CIRCUIT
Disconnect the connector from the motor and inspect the con-
nector on the wire harness side, as shown.
2
17

I04034

Tester connection Condition Specified condition

2 - Ground Always Continuity
17 - Ground Ignition switch LOCK or ACC No voltage
17 - Ground Ignition switch ON Battery Positive Voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2076

BE-76
BODY ELECTRICAL - WIPER AND WASHER SYSTEM

Wiper Motor Side B

4. Low speed:
INSPECT FRONT WIPER MOTOR OPERATION
Connect the positive (+) lead from the battery to terminal 1 and
the negative (-) lead to terminal 5, check that the motor oper-
S +1 ates at low speed.
If operation is not as specified, replace the motor.
+2 5. High speed:
E
INSPECT FRONT WIPER MOTOR OPERATION
I11337 Connect the positive (+) lead from the battery to terminal 4 and
the negative (-) lead to terminal 5, check that the motor oper-
ates at high speed.
If operation is not as specified, replace the motor.

6. Stopping at stop position:

+5° INSPECT FRONT WIPER MOTOR OPERATION
0° - 10°
(a) Operate the motor at low speed and stop the motor opera-
tion anywhere except at the stop position by disconnect-
ing positive (+) lead from terminal 1.
(b) Connect terminals 1 and 3.
(c) Connect the positive (+) lead from the battery to terminal
Automatic Stop 2 and negative (-) lead to terminal 5, check that the motor
Position I11338 stops running at the stop position after the motor operates
again.
If operation is not as specified, replace the motor.

7. Connector disconnected:
Wire Harness Side
INSPECT FRONT WIPER MOTOR CIRCUIT
Disconnect the connector from the motor and inspect the con-
nector on the wire harness side, as shown.

I04076

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2077

 BE-77
BODY ELECTRICAL - WIPER AND WASHER SYSTEM

Tester connection Condition Specified condition

4 - Ground Always Continuity
2 - Ground Ignition switch LOCK or ACC No voltage
2 - Ground Ignition switch ON Battery Positive Voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

Wiper and Washer Switch Side 8. INSPECT FRONT WASHER LINKED OPERATION
(a) Connect the positive (+) lead from the battery to terminal
7 2 16 and the negative (-) lead to terminal 2.
(b) Connect the positive (+) lead from the voltmeter to termi-
nal 7 and the negative (-) lead to terminal 2.
(c) Push in the washer switch, and check that the voltage
changes as shown in the table.
16
E00072
Washer Switch ON
OFF

Less than 1 sec. Approx. 3 sec.

Battery Voltage
0V
N11301

If operation is not as specified, replace the wiper and washer

switch.

9. INSPECT REAR WIPER MOTOR OPERATION

3 1 (a) Connect the positive (+) lead from the battery to terminal
3 and negative (-) lead to terminal 1 and the motor body,
check that the motor operates.

I23237

(b) Disconnect the negative (-) lead from terminal 1, check

3 1 that the motor stops running at the stop position.
If operation is not as specified, replace the motor.

I23238

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2078

BE-78
BODY ELECTRICAL - WIPER AND WASHER SYSTEM

10. Intermittent:
2
3 INSPECT REAR WIPER MOTOR OPERATION
Connect the positive (+) lead from the battery to terminal 3 and
the negative (-) lead to terminal 2 and the motor body, check
that the motor operates intermittently for 9-15 seconds.
If operation is not as specified, replace the motor.

I23239

11. Connector disconnected:

Wire Harness Side
INSPECT REAR WIPER MOTOR CIRCUIT
Disconnect the connector from the motor and inspect the con-
nector on the wire harness side, as shown.

I04077

Tester connection Condition Specified condition

1 - Ground Always Continuity
2 - Ground Always Continuity
3 - Ground Ignition switch OFF or ACC No voltage
3 - Ground Ignition switch ON Battery positive voltage

If circuit is not as specified, inspect the circuits connected to oth-

er parts.

12. Wagon:
INSPECT REAR WASHER LINKED OPERATION
Make sure that the rear wiper operates simultaneously with the
washer when the rear washer switch is turned ON.

If the rear wiper does not operates, inspect the rear
wiper motor.

If washer fluid dose not come out, inspect the wash-
er motor.

If necessary, replace the wiper and washer switch.

13. Sedan:
2
INSPECT WASHER MOTOR OPERATION
Connect the positive (+) lead from the battery to terminal 2 and
the negative (-) lead to terminal 1, check that the motor oper-
1
ates.
NOTICE:
These tests must be performed quickly (within 20 seconds) to
prevent the coil from burning out.
I01272 If operation is not as specified, replace the motor.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2079

 BE-79
BODY ELECTRICAL - WIPER AND WASHER SYSTEM

14. Sedan, Connector disconnected:

Wire Harness Side
INSPECT FRONT WASHER MOTOR CIRCUIT
Disconnect the connector from the motor and inspect the con-
nector on the wire harness side, as shown.

I04077

Tester connection Condition Specified condition

2 - Ground Ignition switch ON Battery Positive Voltage

If circuit is not as specified, inspect the power source, wire har-

ness and wiper switch.

15. Wagon:
INSPECT FRONT WASHER MOTOR OPERATION
Connect the positive (+) lead from the battery to terminal 2 and
the negative (-) lead to terminal 1, check that the motor oper-
2 1 ates.
NOTICE:
These tests must be performed quickly (within 20 seconds)
to prevent the coil from burning out.
I12043 If operation is not as specified, replace the motor.

16. INSPECT REAR WASHER MOTOR OPERATION

Connect the positive (+) lead from the battery to terminal 2 and
the negative (-) lead to terminal 3, check that the motor oper-
ates.
3 2 NOTICE:
These tests must be performed quickly (within 20 seconds)
to prevent the coil from burning out.
If operation is not as specified, replace the motor.
I12044

17. Wagon, Connector disconnected:

Wire Harness Side
INSPECT WASHER MOTOR CIRCUIT
Disconnect the connector from the motor and inspect the con-
nector on the wire harness side, as shown.

I23252

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2080

BE-80
BODY ELECTRICAL - WIPER AND WASHER SYSTEM

Tester connection Condition Specified condition

2 - Ground Ignition switch ON Battery positive voltage
If circuit is not as specified, inspect the power source, wire har-
ness and wiper switch.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2081

 BE-81
BODY ELECTRICAL - COMBINATION METER

COMBINATION METER
BE2A1-03

LOCATION
Brake Master Cylinder
Engine Room Junction Block
Brake Fluid Level Warning Switch

H-LP RH Fuse

ECM

Passenger Side Junction Block

MPX-B Fuse

SRS-B Fuse

Combination Meter

Light Control Rheostat

Parking Brake
Driver Side Junction Block Switch Occupant

Body ECU Detection Sensor

GAUGE Fuse Seat Belt

TAIL Fuse Buckle Switch
I27815

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2082

BE-82
BODY ELECTRICAL - COMBINATION METER

Sedan:

Sub Fuel Sender Gauge

Main Fuel Sender Gauge

Wagon:

Sub Fuel Sender Gauge

Main Fuel Sender Gauge

I27816

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2083

 BE-83
BODY ELECTRICAL - COMBINATION METER

Water Temperature Sender Gauge

Oil Pressure Switch

M/T Vehicle

Speed Sensor

Back-up Light Switch

A/T Vehicle

Neutral Start Switch

I11340

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2084

BE-84
BODY ELECTRICAL - COMBINATION METER
BE16C-04

CIRCUIT

Connector ”B” Connector ”A”

I18580

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2085

 BE-85
BODY ELECTRICAL - COMBINATION METER

SG SPEED
LCD PA
TACHO
EU
EG ECONO
D
DE
R
. . VOLT
A14 Tacho Signal I
TL
V TEMP
A19 Signal AC
E
A12 SPD CD FUEL
R
B1 SPD GROUND H
.
ECU
Speed Control Unit A13
Buzzer 5V Power IGN A17
Circuit MPX +B A15

A/D
MPX (-) A21
MPX (+) A20
B9 CHG- SRS +B
Oil Maint Door
SRS +B A16
Charge 5V
Security
Oil Level P Security B8
R
Oil Pressure
D N
D Seat Belt R
R D
SNOW I
I 3
V
V ECT PWR
E 2
E Fuel Level R L
R
Cruise M
Brake TURN L
IG+ TURN L A2
TURN R TURN R A3
A6 BRK LEVEL
Hi-Beam BEAM (+) A4
A5 BEAM (-)
Illumination ILL + A22
A10 Illumination SRS +B
SRS
A8 SRS
IG+
Check Engine
A7 CHECK ENGINE
ABS
A9 ABS
TRC OFF
B3 TRC OFF
SLIP
B4 SLIP
Rear Lights
B6 Rear Lights
H-LP LEVEL
A11 H-LP LEVEL
VSC
B5 VSC

I27848

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2086

BE-86
BODY ELECTRICAL - COMBINATION METER

No. Wiring connector side

2 Turn signal light switch (Left)

3 Turn signal light switch (Right)
4 HEAD Fuse
5 Headlight dimmer switch
6 Brake fluid level warning switch
7 ECM
8 Airbag sensor assembly
9 ABS ECU
10 Rheostat light control volume
A 11 Headlight beam level control ECU
12 Speed sensor (M/T) or ABS ECU (A/T)
13 Speed control unit
14 ECM
15 MPX+B Fuse
16 SRS+B Fuse
17 GAUGE Fuse
18 Power ground
19 Signal ground
20 Multiplex communication circuit (MPX+)
21 Multiplex communication circuit (MPX-)
22 TAIL Fuse
1 Speed signal ground (M/T vehicle only)
3 ABS and TRC ECU
4 ABS and TRC ECU
B 5 ABS and TRC ECU (w/ VSC)
6 Light failure sensor
8 Theft deterrent ECU
9 Daytime running light ECU

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2087

 BE-87
BODY ELECTRICAL - COMBINATION METER
BE0HJ-13

COMPONENTS
Bulbs Wire Harness

Combination Meter Case

Combination Meter ECU

Trip Knob

Sub Circuit Plate

Speedometer Assembly

Tachometer Fuel Receiver Gauge

Combination Meter Glass

Combination Meter
Plate No.1

I18579
2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2088

BE-88
BODY ELECTRICAL - COMBINATION METER
BE16D-04

DISASSEMBLY
HINT:
Installation is in the reverse order of removal. Only if there is a
specified procedure for installation it is shown.
1. REMOVE INSTRUMENT PANEL LWR
(See page BO-135 )
2. REMOVE INSTRUMENT CLUSTER FINISH PANEL
3. REMOVE COMBINATION METER ASSEMBLY
4. REMOVE COMBINATION METER GLASS
5. REMOVE COMBINATION METER PLATE NO. 1

6. REMOVE COMBINATION METER CASE

(a) Separate the wire harness connector at the upper side of
the combination meter assembly from the combination
meter computer.
(b) Remove the 6 screws as shown in the illustration, and re-
move the combination meter.
7. REMOVE THE WIRE HARNESS

I18575

8. REMOVE SPEEDOMETER ASSEMBLY

Pull the speed meter assembly in the direction indicated by the
arrow in the illustration and disconnect the engagement of the
combination meter computer assembly to remove the speed
meter assembly.
NOTICE:
Use gloves so as not to scratch or stain the panel surface.
Do not apply unnatural force.
I18576 9. REMOVE ENGINE TACHO METER ASSEMBLY
HINT:
Remove it in the same procedure as for the speed meter as-
sembly.
10. REMOVE FUEL RECEIVER GAUGE.
HINT:
Remove it in the same procedure as for the speed meter as-
sembly.
11. REMOVE TRIP KNOB
12. REMOVE COMBINATION METER COMPUTER AS-
SEMBLY

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2089

 BE-89
BODY ELECTRICAL - COMBINATION METER

13. INSTALL FUEL RECEIVER GAUGE

Install the fuel receiver gauge to the combination meter comput-
er assembly, and check that the gauge terminal shown in the
illustration are fitted in securely.

I11367

14. INSTALL ENGINE TACHO METER ASSEMBLY

Install the engine tacho meter assembly to the combination me-
ter computer assembly, and check that the gauge terminals
shown in the illustration are fitted in securely.

I11368

15. INSTALL SPEEDOMETER ASSEMBLY

Install the speedometer assembly to the combination meter
computer assembly, and check that the gauge terminals shown
in the illustration are fitted in securely.

I11369

16. INSTALL WIRE HARNESS

Route the wire harness as shown in the illustration and install
it to the combination meter case.

I11370

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2090

BE-90
BODY ELECTRICAL - COMBINATION METER
BE1WU-04

INSPECTION
1. INSPECT COMBINATION METER CIRCUIT
Connector connected:
Connect connector ”A” and ”B” from the combination meter and
inspect the connectors on the wire harness side as shown in the
table.

Connector connected

Connector B” Connector A”

I11995

Tester connection Condition Specified condition

A2 - Ground
Ignition switch ON and turn signal switch Left Battery voltage
(Turn L)
A3 - Ground
Ignition switch ON and turn signal switch Right Battery voltage
(Turn R)

A4 - Ground
Always Battery voltage
(Beam +)

A5 - Ground
Headlight dimmer switch HI Battery voltage
(Beam -)

A6 - Ground Ignition switch ON and Brake fluid level warning

Battery voltage
(BRK level) switch LO

A7 - Ground
Ignition switch ON and engine running Battery voltage
(Check engine)
A8 - Ground
SRS warning light does not light up Battery voltage
(SRS)

A9 - Ground Ignition switch ON and ABS warning does not

Battery voltage
(ABS) lights up

A10 - Ground
Light control switch TAIL or HEAD Continuity
(ILL-)

A11 - Ground
Headlight beam level control system is operation Battery voltage
(Headlight beam level)
A12 - Ground
Ignition switch ON and turn propeller shaft slowly Battery voltage
(Speed signal input)

A13 - Ground
Ignition switch ON and turn propeller shaft slowly 1 V to 4.5 - 5.5 V
(Speed signal output)

A14 - Ground
Engine running Pulse generation *1
(Tachometer signal)

A15 - Ground
Always Battery voltage
(MPX +B)

Author
: Date
: 2091

 BE-91
BODY ELECTRICAL - COMBINATION METER

A16 - Ground
Always Battery voltage
(DOME +B)

A17 - Ground
Ignition switch ON Battery voltage
(IGN)
A18 - Ground
Always Continuity
(Power ground)

A19 - Ground
Always Continuity
(Signal ground)

A20 - Ground
Ignition switch ON Pulse generation
(MPX+)

A21 - Ground
Ignition switch ON Pulse generation
(MPX-)
A22 - Ground
Light control switch TAIL or HEAD Battery voltage
(ILL+)

B1 - Ground
Always Continuity
(SP ground)

B3 - Ground Ignition switch ON and TRC OFF indicator does

Battery voltage
(TRC OFF) not light up

B4 - Ground Ignition switch ON and SLIP indicator does not

Battery voltage
(SLIP) light up
B5 - Ground Ignition switch ON and VSC indicator does not
Battery voltage
(VSC) light up

B6 - Ground
Ignition Switch ON and rear lights bulb is blown Battery voltage
(Rear Lights)

B8 - Ground
Theft deterrent system is operating Battery voltage
(Security)

B9 - Ground
Engine running Battery voltage
(Alternator L terminal)

If circuit is not as specified, wiring diagram and inspect the cir-

cuits connected to other parts.

Author
: Date
: 2092

BE-92
BODY ELECTRICAL - COMBINATION METER

2. INSPECT SPEEDOMETER/ON-VEHICLE
Using a speedometer tester, inspect the speedometer for allow-
able indication error and check the operation of the odometer.
HINT:
Tire wear and tire over or under inflation will increase the indica-
tion error.
USA (mph) CANADA (km/h)
Standard indication Allowable range Standard indication Allowable range
20 18.5 - 21.5 20 18 - 23
40 38 - 41.5 40 40 - 44
60 58 - 62 60 60 - 64.5
80 77.5 - 82 80 80 - 85
100 97 - 102 100 100 - 105
120 116.5 - 122 120 120 - 125.5
140 136 - 142 140 140 - 146
160 160 - 167
180 180 - 188
200 200 - 209
220 220 - 230
240 240 - 251

If error is excessive, replace the speedometer.

3. INSPECT SPEEDOMETER RESISTANCE

A
(See page DI-877 )
Measure the resistance between terminals with fixing pointer to
C the stopper.
Tester connection Resistance (Ω)
B A-D 160
B-C 160
D If resistance value is not as the specified, replace the meter.
I11350

4. INSPECT VEHICLE SPEED SENSOR OPERATION

(See page DI-885 )
(a) Connect the positive (+) lead from battery to terminal 1
and negative (-) lead to terminal 2.
3 2 1 (b) Connect the positive (+) lead from tester to terminal 3 and
negative (-) lead to terminal 2.
(c) Rotate shaft.
(d) Check that there is a voltage change from approx. 0 V to
I11355 11 V or more between terminals 2 and 3.

Author
: Date
: 2093

 BE-93
BODY ELECTRICAL - COMBINATION METER

HINT:
The voltage change should be 4 times for every revolution of
the speed sensor shaft.
If operation is not as specified, replace the sensor.

5. INSPECT TACHOMETER/ON-VEHICLE
(a) Connect a tune-up test tachometer, and start the engine.
NOTICE:

Reversing the connection of the tachometer will dam-
age the transistors and diodes inside.

When removing or installing the tachometer, be care-
ful not to drop or subject it to heavy shocks.
(b) Compare the tester and tachometer indications.
DC 13.5 V 25 °C at (77°F)
Standard indication Allowable range
700 630 - 770
1,000 (900 - 1,100)
2,000 (1,850 - 2,150)
3,000 2,850 - 3,150
4,000 (3,800 - 4,200)
5,000 4,800 - 5,200
6,000 (5,750 - 6,250)
7,000 6,700 - 7,300
8,000 7,700 - 8,300

6. INSPECT TACHOMETER RESISTANCE

A (See page DI-878 )
Measure the resistance between terminals with fixing pointer to
the stopper.
C
Tester connection Resistance (Ω)
A-D 160

D B B-C 160
If resistance value is not as specified, replace the meter.
I11356

Fuel Receiver Gauge 7. INSPECT FUEL RECEIVER GAUGE OPERATION (See

Ignition page DI-879 )
Switch
(a) Disconnect the connector from the main sender gauge.
(b) Turn the ignition switch ON, check that the receiver gauge
Wire Harness Main
Side needle indicates EMPTY.
Sender
Gauge
Battery

I04086

Author
: Date
: 2094

BE-94
BODY ELECTRICAL - COMBINATION METER

(c) Connect the main sender gauge.

IgnitionFuel Receiver Gauge
Switch (d) Disconnect the connector from the sub sender gauge.
(e) Turn the ignition switch ON, check that the receiver gauge
Sub needle indicates EMPTY.
Wire Harness Sender
Side Gauge HINT:
Because of the silicon oil in the gauge, it will take a short time
Battery 1 2
for needle to stabilize.
If operation is not as specified, inspect the receiver gauge resis-
I04087 tance.

8. INSPECT FUEL RECEIVER GAUGE RESISTANCE

(See page DI-919 )
C Measure the resistance between terminals with fixing pointer to
A
the stopper.
Tester connection Resistance (Ω)
D A-D 160
B
B-C 160
If resistance value is not as specified, replace the receiver
I11357
gauge.
9. INSPECT FUEL MAIN SENDER GAUGE RESISTANCE
MAIN
2 Measure the resistance between terminals 1 and 2 for each
float position.
1
3 Float position mm (in.) Resistance (Ω)
F: Approx. 22.9 (0.90) ± 3 (0.12) Approx. 2.0 ± 1.0
1/2: Approx. 58.3 (2.30) ± 3 (0.12) Approx. 30.3 ± 3.0
E: Approx. 133.6 (5.26) ± 3 (0.12) Approx. 55.0 ± 1.0
If resistance value is not as specified, replace the main sender
gauge.

1/2

e- 3 - 1- I11358
B

SUB F
10. INSPECT FUEL SUB SENDER GAUGE RESISTANCE
Measure the resistance between terminals 1 and 2 for each
float position.
1/2 Float position mm (in.) Resistance (Ω)
E F: Approx. 29.1 (1.15) ± 3 (0.12) Approx. 2.0 ± 1.0
1/2: Approx. 65.8 (2.59) ± 3 (0.12) Approx. 29.7 ± 3.0
E: Approx. 169.5 (6.67) ± 3 (0.12) Approx. 55 ± 1.0

If resistance value is not as specified, replace the sub sender

I11359
gauge.

Author
: Date
: 2095

 BE-95
BODY ELECTRICAL - COMBINATION METER

11. INSPECT WATER TEMPERATURE RECEIVER GAUGE

OPERATION (See page DI-881 )

12. INSPECT WATER TEMPERATURE RECEIVER GAUGE

A
C RESISTANCE
Measure the resistance between terminals with fixing pointer to
the stopper.
Tester connection Resistance (Ω)
D
B A-D 160
B-C 160
If resistance value is not as specified, replace the receiver
I11351
gauge.
HINT:
This circuit includes the diode.
If resistance value is not as specified, replace the receiver
gauge.

Ignition 13. INSPECT LOW OIL PRESSURE WARNING LIGHT

Warning Light
Switch (a) Disconnect the connector from the warning switch and
ground terminal on the wire harness side connector.
(b) Turn the ignition switch ON and check that the warning
Wire Harness Side
light lights up.
Battery If the warning light does not light up, test the bulb.
1

I01277

14. INSPECT VOLTAGE GAUGE RESISTANCE (See page

A DI-883 )
C Measure the resistance between terminals with fixing pointer to
the stopper.
Tester connection Resistance (Ω)
A-D 160
D
B B-C 160

If resistance value is not as specified, replace the receiver

I11352
gauge.

Author
: Date
: 2096

BE-96
BODY ELECTRICAL - COMBINATION METER

15. INSPECT SPECIFIC FUEL CONSUMPTION GAUGE

RESISTANCE (See page DI-884 )
Measure the resistance between terminals with fixing pointer to
the stopper.
C A
Tester connection Resistance (Ω)
A-D 160
B-C 160
D
B If resistance value is not as specified, replace the meter.
I11353

16. INSPECT OIL PRESSURE SENDER CONTINUITY

(a) Disconnect the connector from the oil presser sender.
(b) Check that no continuity exists between terminal and
ground with the engine stopped.
(c) Check that continuity exists between terminal and ground
with the engine running.
HINT:
Oil pressure should be over 24.5 kPa (0.25 kgf/cm2, 3.55 psi).
I01278 If operation is not as specified, replace the oil pressure sender.

Ignition Warning Light 17. INSPECT BRAKE WARNING LIGHT

Switch (a) Disconnect the connector from the brake fluid warning
switch.
(b) Release the parking brake pedal.
(c) Connect the terminals on the wire harness side of the lev-
Battery el warning switch connector.
(d) Start the engine, check that the warning light lights up.
If the warning light does not light up, test the bulb or wire har-
I01279 ness.

18. INSPECT BRAKE FLUID LEVEL WARNING SWITCH

CONTINUITY
(a) Remove the reservoir tank cap and strainer.
OFF
(b) Disconnect the connector.
(c) Check that no continuity exists between the terminals with
ON the switch OFF (float up).
(d) Use siphon, etc. to take fluid out of the reservoir tank.
(e) Check that continuity exists between the terminals with
I11489 the switch ON (float down).
(f) Pour the fluid back in the reservoir tank.
If operation is not as specified, replace the switch.

Author
: Date
: 2097

 BE-97
BODY ELECTRICAL - COMBINATION METER

19. INSPECT PARKING BRAKE SWITCH CONTINUITY

(a) Check that continuity exists between the terminal and
switch body with the switch ON (switch pin released).
(b) Check that no continuity exists between the terminal and
switch body with the switch OFF (switch pin pushed in).
If operation is not as specified, replace the switch or inspect
ground point.

I01281

20. INSPECT ENGINE OIL LEVEL WARNING LIGHT

Warning Light
(a) Disconnect the connector from the switch.
Ignition (b) Run the engine.
Switch (c) Turn the ignition switch ON, check that the warning light
Wire Harness Side
lights up approximately 40 seconds later.
Battery If the warning light does not light up, inspect bulb or wire har-
ness.

I04099

21. INSPECT ENGINE OIL LEVEL WARNING SENSOR

(a) Check that continuity exists between terminals when the
sensor-sensed temperature drops to 40 °C or less with
the float down.

OFF

ON
I10740

(b) Heat the switch to above 60 °C (140 °F) in an oil bath.

(c) Check that there is continuity between terminals with the
switch ON (float down).
(d) Check that there is no continuity between terminals with
the switch OFF (float up).
OFF If operation is not as specified, replace the sensor.

ON
I10741

Author
: Date
: 2098

BE-98
BODY ELECTRICAL - COMBINATION METER

22. INSPECT ENGINE OIL LEVEL WARNING SENSOR

Wire Harness Side
CIRCUIT
Disconnect the switch connector and inspect the connector on
wire harness side, as shown.

I04104

Tester connection Condition Specified condition

2 - Ground Always Continuity

If continuity is not as specified, inspect the wire harness or

ground point.

Warning Light
23. INSPECT OPEN DOOR WARNING LIGHT
Disconnect the connector from the door courtesy switch and
ground terminal 1 on the wire harness side, and check that the
warning light lights up.
If the warning light does not light up, inspect the bulb or wire har-
Battery ness.
24. INSPECT DOOR COURTESY SWITCH CONTINUITY
AND CIRCUIT (See page DI-921 )
I01286

Warning Light
25. INSPECT SEAT BELT WARNING LIGHT
(a) Disconnect the connector from the buckle switch.
Ignition (b) Connect terminal on the wire harness side of the buckle
Switch switch connector.
Wire Harness Side (c) Turn the ignition switch ON and check that the warning
Battery light lights up.
If the warning light does not light up, inspect the bulb or wire har-
ness.
I15642

26. INSPECT SEAT BELT BUCKLE SWITCH CONTINUITY

Switch Side Switch Side (a) Check that continuity exists between the terminals 1 and
(w/o Power Seat) (w/ Power Seat) 2 on the switch side connector with the switch ON (belt
fastened).
(b) Check that continuity exists between the terminals 1 and
2 on the switch side connector with the switch OFF (belt
unfastened).
If operation is not as specified, replace the switch.
I15643

Author
: Date
: 2099

 BE-99
BODY ELECTRICAL - COMBINATION METER

27. INSPECT SEAT BELT BUCKLE SWITCH CIRCUIT (See

page DI-917 )
Disconnect the switch connector and inspect the connector on
wire harness side, as shown.
Tester connection Condition Specified condition
2 - Ground Always Continuity
If continuity is not as specified, inspect the circuits connected
to other parts.

Passenger Seat Sensor 28. Passenger seat only:

INSPECT SEAT BELT WARNING OCCUPANT DETEC-
TION SENSOR CONTINUITY
Check that continuity exists between the terminals 1 and 2
when pressing the sensing part.
If operation is not as specified, replace the sensor.

Sensing Area I11361

29. INSPECT LIGHT CONTROL RHEOSTAT OPERATION

Dark (a) Turn the rheostat knob max. dark side and check that the
(5.1 Ω) Bright resistance 5.1 Ω. (Rheostat knob turned to fully counter-
(0Ω) clockwise)
(b) Gradually, turn the rheostat knob from the dark side to
bright side and check that the resistance decreases from
5.1 to 0 Ω. (Rheostat knob turned to clockwise)
If operation is not as specified, replace the rheostat light control.
I11612

Ignition Warning Light 30. INSPECT REAR LIGHTS WARNING LIGHT

Switch (a) Disconnect the connector from the light failure sensor and
ground terminal 4, 5 or 9 on the wire harness side connec-
tor.
Wire Harness Side
(b) Start the engine, check that the warning light lights up.
Battery If the warning light does not light up, inspect the bulb or wire har-
ness.

I04097

31. INSPECT LIGHT FAILURE SENSOR CIRCUIT

Wire Harness Side Disconnect the connector from the sensor and inspect the con-
nector on the wire harness side, as shown.

S-12-1

Z06567

Author
: Date
: 2100

BE-100
BODY ELECTRICAL - COMBINATION METER

Tester connection Condition Specified condition

1 - Ground Always * Continuity
2 - Ground Always * Continuity
3 - Ground Taillight ON Battery Positive Voltage
9 - Ground Always * Continuity
11 - Ground Always Continuity
3 - Ground Taillight or Headlight OFF No voltage
3 - Ground Taillight or Headlight ON Battery Positive Voltage
4 - Ground Ignition switch LOCK or ACC No voltage
4 - Ground Ignition switch ON Battery Positive Voltage
7 - Ground Stop light switch OFF No voltage
7 - Ground Stop light switch ON Battery Positive Voltage
8 - Ground Ignition switch LOCK or ACC No voltage
8 - Ground Ignition switch ON Battery Positive Voltage
*: There is resistance because this circuit is grounded through
the bulb.
If the circuit is not as specified, inspect the circuits connected
to other parts.
32. MAINTENANCE LIQUID RESETTING PROCEDURE
Indicator Condition:
State Condition Specified condition
The indicator blinks for 15 seconds after the igni-
The vehicle runs 4,500 miles after the previous
Blinking tion switch is turned on (Incluing 3 seconds for a
setting.
valve check)
The vehicle runs 5,000 miles after the previous The indicator is continuously illuminated after the
Continuously illuminated
setting. ignition switch is turned on.

(a) Set the display window to ODO.

(b) Turn the ignition switch off.
(c) Pressing the reset switch, turn the ignition switch (Keep
pressing for at least 5 seconds).
(d) The reset procedure is completed.
HINT:

If the ignition switch is turned off during the reset proce-
dure, reset mode is canceled.

If the reset switch is turned off during the reset procedure,
reset mode is canceled.

Author
: Date
: 2101

 BE-101
BODY ELECTRICAL - DEFOGGER SYSTEM

DEFOGGER SYSTEM
BE0GS-21

LOCATION

Defogger Switch

Passenger Side Junction Block

Mirror Heater Relay

Mirror Assembly

Mirror Defogger

Sedan:
Driver Side Junction Block

Defogger Relay

DEFOG Fuse

Mirror Assembly

Mirror Defogger

Wagon:
Defogger Wire

I27817

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2102

BE-102
BODY ELECTRICAL - DEFOGGER SYSTEM
BE1WV-03

INSPECTION
1. INSPECT DEFOGGER SWITCH (See page AC-88 )

2. INSPECT DEFOGGER RELAY CONTINUITY

2 1 Condition Tester connection Specified condition
Always 1-2 Continuity
2 1 Apply B+ between
3-4 Continuity
terminals 1 and 2.
4 3
If continuity is not as specified, replace the relay.
3. INSPECT DEFOGGER RELAY CIRCUIT
4 3 (See page DI-940 )
I01259

4. INSPECT MIRROR DEFOGGER RELAY CONTINUITY

1 2
Condition Tester connection Specified condition
Always 1-2 Continuity
3 5
Apply B+ between
5 3-5 Continuity
terminals 1 and 2.
1 2
If continuity is not as specified, replace the relay.

3
I01200

5. INSPECT DEFOGGER WIRE

NOTICE:

When cleaning the glass, use a soft, dry cloth, and wipe the
Tester Probe
glass in the direction of the wire. Take care not to damage
Heat Wire the wires.

Do not use detergents or glass cleaners with abrasive in-
Tin Foil
gredients.

When measuring voltage, wrap a piece of tin foil around the
I01291 tip of the negative probe and press the foil against the wire
with your finger, as shown.
At Center (a) Turn the ignition switch ON.
(b) Turn the defogger switch ON.
(c) Inspect the voltage at the center of each heat wire, as
shown.
Voltage Criteria
Approx. 5V Okay (No break in wire)
Approx. 10V or 0V Broken wire

I01292

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2103

 BE-103
BODY ELECTRICAL - DEFOGGER SYSTEM

HINT:
Foil strip Several
0 Volts If there is approximately 10 V, the wire is broken between the
Volts
center of the wire and the positive (+) end. If there is no voltage,
Broken the wire is broken between the center of the wire and ground.
Wire (d) Place the voltmeter positive (+) lead against the defogger
Ground side Battery wire on the battery side.
 side (e) Place the voltmeter negative (-) lead with the foil strip

against the wire on the ground side.
I01293 (f) Slide the positive (+) lead from battery to ground side.
(g) The point where the voltmeter deflects from several V to
zero V is the place where the defogger wire is broken.
HINT:
If the heat wire is not broken, the voltmeter indicates 0 V at the
positive (+) end of the heat wire but gradually increases to about
12 V as the meter probe moves to the other end.

6. IF NECESSARY, REPAIR DEFOGGER WIRE

Repair Point (a) Clean the broken wire tips with grease, wax and silicone
remover.
(b) Place the masking tape along both sides of the wire for
repair.
Broken
(c) Thoroughly mix the repair agent (Dupont paste No.
Wire
4817).
Masking Tape

I01294

(d) Using a fine tip brush, apply a small amount of the agent
to the wire.
(e) After a few minutes, remove the masking tape.
(f) Do not repair the defogger wire for at least 24 hours.

I01295

4 7. w/ Mirror heater:
5 INSPECT MIRROR DEFOGGER OPERATION
(a) Connect the positive (+) lead from the battery to terminal
5 and the negative (-) lead to terminal 4.
(b) Check that the mirror becomes warm.
HINT:
It will take a short time for the mirror to become warm.

I23212

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2104

BE-104
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM

POWER WINDOW CONTROL SYSTEM

BE02C-15

TROUBLESHOOTING
Malfunction symptoms Applicable chart
Driver’s door does not operate. 1
Passenger’s and all rear doors do not operate by using the switches at each
2
seat.

Any of passenger’s and rear doors does not operate by using the switches of
3
each seat.
Passenger’s and all rear doors are not controlled remotely by using the mas-
4
ter switch. (Switches of each door can be operated.)

AUTO UP and AUTO DOWN does not operate. (Prepare a normal master
5
switch.)

DOWN operation operates during door glass AUTO UP operation. 6

Even though a foreign object is caught, DOWN operation does not function. 7
After ignition switch has been turned to OFF by using a key, power window
8
function does not operate.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2105

 BE-105
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM

1 Driver’s door does not operate.

Remove the power window regulator master switch

and disconnect the connector.

Check there is voltage of 10 of 14 V between terminal 1 No Wire harness defective (between power
of vehicle side connector of master switch and body ground. fuse terminal 1 of master switch.)

Yes

With ignition switch ON, is there voltage of 10 to 14 V Yes Wire harness (between terminal of the
between the terminal 2 and 4 of vehicle side connector of power main relay and 2 or 4 terminal of the
the master switch and body ground. master switch.)
No

No
Does continuity exist between 9 terminal of vehicle side Wire harness defective (between 9 termi-
connector of the master switch and body ground? nal of the master switch and body ground.)

Yes

Yes
When battery voltage is supplied to the vehicle side con- Power window regulator master switch de-
nector of the master switch, check if the door glass operate. fective.

Connection Glass operation

Battery positive - 8 terminal
Battery negative - 20 terminal UP

Battery positive - 20 terminal

Battery negative - 8 terminal DOWN

No

No
Is the power motor normal? Power window motor defective.

Yes

Wire harness (between 20 terminal of the master switch

and 2 terminal of the power window motor or 8 terminal
of the master switch and 1 terminal of the power window).

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2106

BE-106
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM

2 Passenger’s and all rear doors do not operate by using the switches of each seat.

Remove the power window regulator master switch.

(with connectors connected)

With the ignition switch ON, is the voltage normal between 6 No Power window regulator master switch
terminal of the master switch and body ground? detective.
OK:
Window lock switch NORMAL --------- 10 to 14 V
Window lock switch LOCK ------------ 0 V

Yes

Go to chart 3

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2107

 BE-107
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM

3 Any of passenger’s and all rear doors does not operate by using the switches at each seat.

Remove the power window regulator switch at the

seat where the operation is unavailable and
disconnect the connector.

With the ignition switch ON and window lock switch NORMAL, No Wire harness defective (between 6 terminal
is there voltage of 10 to 14 V between 11 terminal of the of master switch and 11 terminal of regulator.)
vehicle side connector of the regulator switch and body ground?
Yes

Yes
Is there the voltage of 10 to 14 V between 7 terminal of vehicle Wire harness defective (between POWER
side connector of the regulator switch and body ground? fuse and 7 terminal of the regulator.)

No

No
Is there continuity between 7 terminal of the vehicle side Wire harness defective (between 12 terminal
connector of the regulator switch and body ground. of the regulator and body ground.)

Yes

Yes
When battery voltage is supplied to the vehicle side connector Power window regulator master switch
of the regulator switch, check if the door glass operate. defective.

Connection Glass operation

Battery positive - 6 terminal
Battery negative - 1 terminal UP

Battery positive - 1 terminal

Battery negative - 6 terminal DOWN

No

No
Is the power motor normal? Power window motor defective.

Yes

Wire harness (between 6 terminal of the regulator switch

and 4 terminal of the power window motor or 1 terminal
of the regulator switch and 1 terminal of the power window
motor).

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2108

BE-108
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM

4 Passenger’s and all rear doors are not controlled remotely by using the master switch.
(Switches at each door can be operated.)

Remove the power window master switch.

(With connector connected)

With the ignition switch ON is there voltage of 25 between 18 No Power window master switch defective.
terminal of vehicle side connector of the master switch and
body ground?
Yes

Remove the power window regulator switch at the

seat where the remote operation is unavailable and
disconnect the connector.

With the ignition switch ON, and window lock switch NORMAL, No Wire harness defective (between 18 terminal
is there voltage of 10 to 14 V between 8 terminal of the of the maser switch and 8 terminal of the
vehicle side connector of regulator switch and body ground? regulator switch.)

Yes

Yes
Replace the regulator switch with the normal one from the Power window regulator switch defective.
other seats, when operating by remote function, does
power window operate normally?

No

Power window regulator master switch defective.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2109

 BE-109
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM

5 AUTO UP and AUTO DOWN do not operate. (Prepare a normal master switch.)

Remove the master switch or regulator switch at

the seat where AUTO UP and AUTO DOWN is
unavailable. (With connectors connected)

Master of regulator switch inspection:

Are the voltage and continuity of the connectors connected to the master switch or regulator switch normal?
OK:

Terminal No. Item Inspection condition Standard

13 3 Voltage Fully open by manual operation → Less than 1 → 10 V to
fully close → switch OFF 14 → 0 V
12 4 Voltage During power window operation Approx. 5.5 V
10 2 Continuity Constant Continuity

No Yes

Disconnect the connectors of the master switch or Master or regulator switch defective.
regulator switch and power window motor.

Does continuity exist between connectors of the following No Wire harness defective (Open circuit in each
vehicle side connectors? terminal)
Switch side ↔ Motor side
13 (3) terminal ↔ 3 terminal
12 (4) terminal ↔ 4 terminal
10 (2) terminal ↔ 2 terminal
The number in parenthesis shows the terminal No.

Yes

No
Does continuity exist between 13 (3), 12 (4) and 10 (2) Wire harness defective (Short circuit).
terminals on the switch side or 3, 4, 2 terminals and
body ground?

Yes

Connect the connector of power window motor.

Yes
Connect the normal master switch or regulator switch and Master switch or regulator switch.
check if AUTO UP and DOWN operates.
No

Power window motor defective.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2110

BE-1 10
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM

6 DOWN operates during door glass AUTO UP operation.

When UP operates by AUTO UP operation or starting up Yes

Disassemble the door and repair or replace
by key OFF operation, is there any factor to increase the
the malfunction part.
sliding resistance of door glass around the reverse position?

No

Remove the window regulator assembly.

After assembling and raising the door glass manually, does No Inspect and replace the door glass run and
it slide smoothly without being caught? window guide.

Yes

Remove the power window motor from the power window

regulator assembly?

No
When the power window regulator is slide manually, does Power window regulator defective.
it slide smoothly without being caught or is there any
damage to the gear parts?

Yes

No
Does the power window motor rotate smoothly? Power window motor defective.

Yes

Reset the power window motor (Initial position setting

of limit switch), assemble the power window regulator
to the vehicle.

Yes
Does the door glass operates normally? Normal (Perform the function check.)

No

Master or regulator switch defective.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2111

 BE-1 11
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM

7 Even through a foreign object is caught, DOWN operation does not function.

Does the jam protection function operate? No

Normal (Perform the function check).
With the ignition switch ON, AUTO UP starts.
After starting up by key OFF operation,
AUTO UP or UP starts.

Yes

With the ignition switch ON, does AUTO UP and AUTO No Go to chart 5.
DOWN operate?

Yes

Yes
Is there foreign object caught in the area of jam protection
function operating?

Out of operating area

4 mm away from the door glass fully opened position.

No

Reset the power window motor and assemble it to

the vehicle.

Yes
Does the door glass operates normally? Normal (After inspecting repeatedly,
perform the function check.)
No

Master or regulator switch defective.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2112

BE-1 12
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM

8 After ignition switch has been turned OFF by using a key, power window function does not operate.

No
Is the driver ’s courtesy light switch normal? Driver’s courtesy light switch defective.

Yes

Remove the instrument controller and junction

and disconnect the connector.

With the driver’s door open, does continuity exist between No Wire harness defective (between A20 terminal
A20 terminal of vehicle side connector and body ground? of the instrument controller and junction
and driver’s courtesy light switch)

Yes

Connect the connectors of the instrument controller and

junction.

No
With the driver’s door open, when turning the ignition Instrument controller and junction
switch from ON to OFF, is there voltage of 10 to 14 V defective.
between the C2 terminal of the instrument controller
and junction and body ground?

Yes

Wire harness defective (between C2 terminal of the

instrument controller and junction and 1 terminal
of the power main relay).

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2113

 BE-1 13
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM
BE2A2-02

LOCATION

Passenger side Junction Block

Power Main Relay

MPX-B Fuse
Power Window Master Switch
D RR POWER Fuse

P RR POWER Fuse

R RR POWER Fuse

Power Window Switch

Ignition Switch

Driver Side Junction Block

Body ECU
Rear Power Window Switch

ECU-IG Fuse

METER Fuse

D FR POWER Fuse
Sedan:

Power Window Regulator

Power Window Motor

Pulse Switch

Limit Switch Power Window Regulator

Power Window Motor
I27818

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2114

BE-1 14
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM

Wagon:

Rear Power Window Switch

Power Window Regulator

Power Window Motor

Pulse Switch
Power Window Regulator

Limit Switch

Power Window Motor

I27819

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2115

 BE-1 15
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM
BE16F-04

Limit switch malfunction INSPECTION

1. INSPECT DIAGNOSIS CODE IS OUTPUT
Repeat
1.5 min. Check that the master switch assembly automatic light flash un-
2.0 min.
der the condition of KEY off operation (for 45 secs. after the
starter switch has been turned from ON to OFF with the driver’s
Pulse sensor malfunction door open.)
HINT:
Repeat
Limit switch malfunction:
0.5 min.
Even though the glass goes down from the fully closed
1.0 min. position, the power window regulator switch assembly
does not detect a change in limit switch signal within 2.0
Limit switch and Pulse sensor malfunction
secs. after the operation has started.

Pulse sensor malfunction:
Even though the glass goes down from the fully closed
1.5 min.
1.5 min. 0.5 min.
position, the power window regulator switch assembly
0.5 min.
0.5 min. 0.5 min.
does not detect a change in pulse switch signal within 2.0
2.5 min. 4.0 min. 3.5 min. 4.0 min.
secs. after the operation has started.

Repeat I11371

2. Connector disconnected:
Wire Harness Side
INSPECT POWER WINDOW MASTER SWITCH CIR-
CUIT
Disconnect the connectors from the switch and inspect connec-
tor on the wire harness side.

I11468

Tester connection Condition Specified condition

9 - Ground Always Continuity
1, 5 - Ground Always Battery Positive Voltage
2, 4 - Ground Ignition switch LOCK No voltage
2, 4 - Ground Ignition switch ACC or ON Battery Positive Voltage
If circuit is not as specified, replace the switch.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2116

BE-1 16
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM

3. INSPECT POWER WINDOW MASTER SWITCH CIR-

CUIT (See page DI-935 )

4. INSPECT POWER WINDOW SWITCH CONTINUITY

Connect the positive (+) lead from the battery to terminal 3 and
the negative (-) lead to terminal 6.
Switch position Tester connection Specified condition

2 1 2-3
UP Continuity
6 5 4 3 4-5
OFF - No continuity
2-4
DOWN Continuity
I11375 3-5

If continuity is not as specified, replace the switch.

5. INSPECT POWER WINDOW SWITCH CIRCUIT (See
page DI-938 )

6. INSPECT POWER MAIN RELAY CONTINUITY

1 2
Condition Tester connection Specified condition
Always 1-2 Continuity
3 5
Apply B+ between
3-5 Continuity
5 terminals 1 and 2.
1 2
If continuity is not as specified, replace the relay.

3
I01200

7. Driver’s door:
Counter clockwise INSPECT POWER WINDOW MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (-) lead to terminal 2, and check that
the motor turns clockwise.
(b) Reverse the polarity, check that the motor turns counter-
clockwise.
Clockwise
If operation is not as specified, replace the motor.
Driven Gear
I11376

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2117

 BE-1 17
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM

Driven Gear 8. Front passenger’s door and rear door:

INSPECT POWER WINDOW MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal
Clockwise 1 and the negative (-) lead to terminal 2, and check that
the motor turns clockwise.
(b) Reverse the polarity, check that the motor turns counter-
clockwise.
If operation is not as specified, replace the motor.
Counter clockwise I11377 9. INSPECT POWER WINDOW MOTOR CIRCUIT (See
page DI-935 )
10. INSPECT POWER WINDOW MOTOR PTC OPERA-
UP Side
TION
(a) Disconnect the connector from the master switch.
(b) Connect the positive (+) lead from the battery to terminal
1 and the negative (-) lead to terminal 2 on the wire har-
ness side connector and raise the window to full closed
position.
(c) Continue to apply voltage, check that there is a PTC op-
Driven Gear I11378 eration noise within approximately 4 to 90 seconds.
(d) Reverse the polarity, check that the window begins to de-
scend within approximately 60 seconds.
If operation is not as specified, replace the motor.
11. INSPECT JAM PROTECTION FUNCTION
NOTICE:
Never, ever be caught any part of your body when check-
ing.
HINT:
In case of performing resetting of the limit switch, do checking
after repeating up and down of the glass with automatic opera-
tion.
(a) Confirmation of AUTO up operation:
Confirm that the window will be fully close with AUTO up
operation.
(b) Checking of the operation of the jam protection function:
(1) Move up the window with AUTO up operation and
check that the window will go down when it touches
the handle of the hammer stetted.
(2) Confirm that the window will then stop going down
about 200 mm.
HINT:
In case of removing the glass, glass guide, regulator and etc.
be sure to perform checking of the jam protection function.
If the jam protection is not functioned properly, adjust power
window motor reset switch and pulse switch.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2118

BE-1 18
BODY ELECTRICAL - POWER WINDOW CONTROL SYSTEM
BE0HG-21

ADJUSTMENT
HOW TO RESET POWER WINDOW MOTOR (RESET SWITCH AND PULSE SWITCH)
If the jam protection is not functioned properly, perform the following procedure.
HINT:
It is necessary to reset the power window motor (in initial position for the limit switch) when separating the
window regulator from the power window motor or operating the window regulator with the door glass not
installed.
(a) Remove the power window motor (See page BO-17 , BO-28 ).
HINT:
Place the matchmarks on the power window motor and window regulator gear.
(b) Connect the power window motor and power window switch to wire harness of the vehicle.
(c) Turn the ignition switch ON and operate the power window switch to idle the power window motor in
UP side direction for more than 6 rotations or less than 10 rotates (4 seconds or more).
(d) Assemble the power window motor and regulator.
HINT:

Install the motor when the regulator arm is below the middle point.

Align the matchmarks on the power window motor and window regulator gear.
(e) Assemble the power window regulator and door glass.
HINT:
Never rotate the motor to the down direction until the completion of the window glass installation.
(f) Connect power window switch to wire harness and turn the ignition switch ON.
(g) Repeat UP and DOWN operation several times manually.
(h) Check if AUTO UP → AUTO DOWN operates in automatic operation.
HINT:

Take care that the jam protection function does not operate just after resetting.

Reset the regulator again when performing the reverse operating after closing the window fully by
AUTO UP operation.
(i) Check the power window function.

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 BE-1 19
BODY ELECTRICAL - POWER DOOR LOCK CONTROL SYSTEM

POWER DOOR LOCK CONTROL SYSTEM

BE2A3-02

LOCATION

Power Window Master Switch

Door Lock Manual Switch

Passenger Side
Junction Block

DOME Fuse
Ignition Switch

MPX-B Fuse

Driver Side Junction Block

Body ECU

ECU-IG Fuse Door Lock Assembly

DOOR Fuse
Door Lock Motor

Door Unlock Detection Switch

Sedan:

Door Lock Assembly

Door Lock Motor

Door Unlock Detection Switch

Door Key Lock and Unlock Switch Door Courtesy Switch

Door Courtesy Switch

I27820

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BE-120
BODY ELECTRICAL - POWER DOOR LOCK CONTROL SYSTEM

Wagon:
Door Lock Assembly

Door Lock Motor

Door Unlock Detection Switch

Back Door Opener Switch

Door Lock Assembly

Door Lock Motor

Door Unlock Detection Switch

Door Key Lock and Unlock Switch

Door Courtesy Switch

Back Door Lock Assembly
Door Courtesy Switch

Back Door Lock Motor

Back Door Courtesy Switch
Back Door Opener Relay

I27821

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 BE-121
BODY ELECTRICAL - POWER DOOR LOCK CONTROL SYSTEM
BE2A4-02

Wire Harness Side INSPECTION

1. Connector disconnected:
INSPECT POWER WINDOW MASTER SWITCH CIR-
CUIT
Disconnect the connectors from the switch and inspect connec-
tor on the wire harness side.

I11468

Tester connection Condition Specified condition

9 - Ground Always Continuity
1, 5 - Ground Always Battery Positive Voltage
2, 4 - Ground Ignition switch LOCK No voltage
2, 4 - Ground Ignition switch ACC or ON Battery Positive Voltage
15 - Ground (LHD) Driver’s door key lock and unlock switch LOCK No Continuity
15 - Ground (LHD) Driver’s door key lock and unlock UNLOCK Continuity
16 - Ground Each door courtesy switch ON (door opened) No Continuity
16 - Ground Each door courtesy switch OFF (door closed) Continuity
6 - Ground (RHD) Driver’s door key lock and unlock switch LOCK No Continuity
6 - Ground (RHD) Driver’s door lock and unlock switch UNLOCK Continuity
If circuit is not as specified, inspect power source or wire har-
ness.
2. INSPECT POWER WINDOW MASTER SWITCH CIR-
CUIT (See page DI-935 )

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BE-122
BODY ELECTRICAL - POWER DOOR LOCK CONTROL SYSTEM

3. INSPECT DOOR KEY LOCK AND UNLOCK SWITCH

CONTINUITY
Switch position Tester connection Specified condition
LOCK 2-4 Continuity
OFF - No continuity
UNLOCK 2-3 Continuity
UNLOCK
If continuity is not as specified, replace the door lock assembly.
OFF

LOCK

I11382

UNLOCK 4. INSPECT DRIVER SIDE DOOR UNLOCK DETECTION

SWITCH CONTINUITY
Switch position Tester connection Specified condition

LOCK OFF (Door Lock set to

- No continuity
LOCK)
ON (Door Lock set to
1-2 Continuity
UNLOCK)

If continuity is not as specified, replace the door lock assembly.

5. INSPECT PASSENGER DOOR UNLOCK DETECTION
SWITCH CONTINUITY
Switch position Tester connection Specified condition
Driver Side
OFF (Door Lock set to
- No continuity
LOCK)

ON (Door Lock set to

3-4 Continuity
Passenger Side UNLOCK)

If continuity is not as specified, replace the door lock assembly.

I11552

6. INSPECT REAR DOOR UNLOCK DETECTION

SWITCH CONTINUITY
Switch position Tester connection Specified condition
OFF (Door Lock set to
- No continuity
UNLOCK LOCK)

ON (Door Lock set to 1 - 2 (LH side)

Continuity
UNLOCK) 3 - 4 (RH side)
LOCK
If continuity is not as specified, replace the door lock assembly.
I11553

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 BE-123
BODY ELECTRICAL - POWER DOOR LOCK CONTROL SYSTEM

7. INSPECT BACK DOOR OPENER SWITCH CONTINU-

ITY
Switch position Tester connection Specified condition
OFF - No continuity
ON 1-2 Continuity
If continuity is not as specified, replace the switch.

I23219

8. INSPECT DOOR LOCK MOTOR AND J/B CIRCUIT

(a) Remove the body ECU from the driver’s side junction
block.
(b) Connect the positive (+) lead from the battery to J/B termi-
121110 nal 9 and the negative (-) lead to J/B terminal 10, and
check that the door lock link moves to LOCK position.
(c) Reverse the polarity and check that the door link moves
to UNLOCK position.
I11380 If operation is not as specified, inspect door lock motor.

UNLOCK 9. INSPECT DRIVER SIDE DOOR LOCK MOTOR OPERA-

TION
(a) Connect the positive (+) lead from the battery to terminal
5 and the negative (-) lead to terminal 6, and check that
LOCK
the door lock link moves to LOCK position.
(b) Reverse the polarity and check that the door lock link
moves to UNLOCK position.
If operation is not as specified, replace the door lock assembly.
10. INSPECT PASSENGER SIDE DOOR LOCK MOTOR
OPERATION
(a) Connect the positive (+) lead from the battery to terminal
Driver Side 1 and the negative (-) lead to terminal 2, and check that
the door lock link moves to LOCK position.
(b) Reverse the polarity and check that the door lock link
moves to UNLOCK position.
Passenger Side
If operation is not as specified, replace the door lock assembly.

I11552

11. INSPECT REAR DOOR LOCK MOTOR OPERATION

( ): RH side
(a) Connect the positive (+) lead from the battery to terminal
3 (1) and the negative (-) lead to terminal 4 (2), and check
UNLOCK that the door lock link moves to LOCK position.
(b) Reverse the polarity and check that the door lock link
moves to UNLOCK position.
LOCK If operation is not as specified, replace the door lock assembly.
I11553 12. INSPECT DOOR LOCK MOTOR CIRCUIT
(See page DI-931 )
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BE-124
BODY ELECTRICAL - POWER DOOR LOCK CONTROL SYSTEM

13. INSPECT LUGGAGE COMPARTMENT DOOR OPEN-

ER MOTOR OPERATION
Connect positive (+) lead to the terminal 1 and negative (-) lead
to the opener motor body, and check that the motor operates.
If operation is not as specified, replace the motor assembly.

I04020

14. INSPECT LUGGAGE COMPARTMENT DOOR OPEN-

ER MOTOR CIRCUIT (See page DI-927 )

I11314

15. INSPECT BACK DOOR OPENER MOTOR OPERATION

1
Connect positive (+) lead to the terminal 1 and negative (-) lead
to the terminal 2, and check that the motor operates.
2 If operation is not as specified, replace the motor assembly.

I23197

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 BE-125
BODY ELECTRICAL - THEFT DETERRENT SYSTEM

THEFT DETERRENT SYSTEM

BE2A5-02

LOCATION
Engine Room Junction Block

HORN Relay

HORN Fuse

Headlight Relay

Security Horn

Engine Hood
Courtesy Switch

Horn

Theft Deterrent ECU

Driver Side Junction Block

ST Fuse

Taillight Control Relay

Ignition Switch

I27822

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BE-126
BODY ELECTRICAL - THEFT DETERRENT SYSTEM

Door Lock Assembly

Door Lock Motor
Sedan:

Door Unlock Detection Switch

Door Key Lock and Unlock Switch

Luggage Compartment Door Lock Assembly

Luggage Compartment
Door Key Lock and
Unlock Switch

Door Lock Assembly

Door Lock Motor
Wagon:

Door Unlock Detection Switch

Door Key Lock and Unlock Switch

Back Door Opener Switch

Back Door Lock Assembly

I27823

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 BE-127
BODY ELECTRICAL - THEFT DETERRENT SYSTEM
BE16R-03

Connector ”B” INSPECTION

1. INSPECT THEFT DETERRENT INDICATOR LIGHT OP-
1 ERATION
(a) Remove the combination meter.
(b) Disconnect the combination meter connector.
8 (c) Check indicator light lights up when connect the positive
(+) lead from the battery to terminal B8 and the negative
(-) lead to terminal B1 of combination meter connector.
If operation is not as specified, replace the indicator light.
2. INSPECT THEFT DETERRENT INDICATOR LIGHT
CIRCUIT
(See page DI-790 )

I11571

OFF 3. INSPECT ENGINE HOOD COURTESY SWITCH CON-

TINUITY
Switch position Tester connection Specified condition
ON
OFF (closed) - No continuity
ON (opened) 1-2 Continuity

If continuity is not as specified, replace the switch.

I04148

4. INSPECT ENGINE HOOD COURTESY SWITCH CIR-

Wire Harness Side
CUIT
(See page DI-816 )
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.

I10745

Tester connection Condition Specified condition

2 - Ground Always Continuity

If circuit is not as specified, inspect power source or wire har-

ness.

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BE-128
BODY ELECTRICAL - THEFT DETERRENT SYSTEM

5. INSPECT THEFT DETERRENT SIREN BATTERY

(a) The internal battery is fully discharged.
(b) Set the system inside the vehicle.
(c) Disconnect the connector of theft deterrent ECU in this
condition, and sounds the siren for open detection.
(d) The siren battery is normal when the siren sounds for 30
seconds, stops, then after 5 seconds, seconds again.
(e) Replace the siren battery when the siren stops sounding
before 30 seconds elapse the battery because the battery
life has run out.

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 BE-129
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

WIRELESS DOOR LOCK CONTROL SYSTEM

BE2A6-03

LOCATION

Transmitter
Ignition Switch

Key Unlock Warning Switch

Door Lock Assembly

Door Lock Motor

Door Unlock Detection Switch
Door Courtesy Switch

Sedan:

Door Lock Assembly

Door Lock Motor

Door Unlock Detection Switch

Door Courtesy
Switch

Door Lock Assemblies Luggage Compartment

Door Lock Motor Door Lock Assembly

Door Unlock Detection Switch
Courtesy Switch

Door Key Lock and Unlock Switch
Wireless Door Lock
Door Courtesy Switches Control Receiver
I27824

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BE-130
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

Door Lock Assembly

Wagon:
Door Lock Motor

Door Unlock Detection Switch
Door Courtesy Switch
Door Lock Assembly

Door Lock Motor

Door Unlock Detection Switch
Wireless Door Lock
Control Receiver

Door Courtesy
Door Lock Assemblies Switch

Door Lock Motor

Door Unlock Detection Switch

Door Key Lock and Unlock Switch Back Door Lock Assembly

Courtesy Switch

Door Courtesy Switches

I27825

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 BE-131
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM
BE0GN-1 1

PRE-CHECK
Only wireless function (Remote control) will not operate.
(If a new transmitter or a transmitter of the same type that works properly with the vehicle is not available.)

Make the vehicle in the initialized condition:

The initialized condition is the condition when the following conditions are satisfied.
(1) Key plate has not been inserted in the ignition key cylinder.
(2) All the doors are closed. (Door warning light is OFF.)
(3) All the doors are locked.

Basic function check:

Under the standard operation, when repeating UNLOCK and LOCK switch 3 times or more alternately, check the
UNLOCK-LOCK operation from 3rd time onward.

Following procedures are standard operation.
(1) Keep about 1 M away to the right direction from the outside handle of a driver’s seat.
(2) Face the transmitter toward the vehicle and press one of transmitter switches for about 1 sec.
<Reference>

As of the security function, even the wireless function is normal, there may be the case that only UNLOCK opera-
tion will not work.

No Yes

Transmitter LED inspection: Normal

<Reference>
Check when pressing UNLOCK switch
Operative distance may differ according to
and LOCK switch under standard an operator, the way of holding the transmitter
operation, that the transmitter LED or position.
lights up once more.
Because weak electric wave is used, when
Yes there is strong wave or noise in the used
No
frequency ,operation distance might be
shortened.

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BE-132
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

Transmitter battery check:

Yes
Battery faulty.
Replace the transmitter battery with a new or normal
one and check UNLOCK-LOCK function works under
the standard operation.
<Reference>

The battery should be replaced by only the shops with
sufficient skill as new or normal battery is necessary.

Battery quality can be judged by checking the rem-
nant volume of the battery.

No

Make the vehicle be in the initialized condition.

Inspection start by using self diagnostic mode:

Enter into the self diagnostic mode.
If operating door control receiver in the order of 1 through 2, the mode turns to diagnostic mode.
(1) Insert the key plate in the ignition key cylinder and pull out, then insert it again and turn ignition switch
OFF → ON → OFF once within 5 seconds after pulling out.
(2) After completing the procedure within 30 seconds, turn the ignition switch OFF → ON → OFF 9 times.
HINT:
In the case that either (1) or (2) condition is not satisfied, transfer to normal mode.
<Reference>
When completing self diagnostic mode, turn the ignition switch ON.
LOCK and UNLOCK operation and output of luggage door opener signal are not performed under the self
diagnostic mode.
within. within.
5 sec. 30 sec.
Key plate
not inserted

Key plate
inserted
Ignition
switch 1 2 3 9 10
ON

OFF
1st time 9th time

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 BE-133
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

No

Is the method to enter into the

Self diagnostic mode operation check:
diagnostic mode correct?
After the self diagnostic mode input operation has No
been performed, check that the room light (Not entered in self
Yes
diagnostic mode)
Room light Ignition switch OFF No Is the chirping function of operation
ON confirmation room light normal?

OFF Yes
Check door control room light

0.13 sec. 0.5 sec.

Key unlock warning switch inspection:
Yes
(Entered in self diagnostic mode) Check that continuity exists between
connector terminal A3 of MPX body ECU
on the vehicle side and ground by
inserting the key plate into the ignition
Self diagnostic mode check:
key cylinder.
Check that how the room light when pressing each
transmitter switch.
(1) Receiver normal wave of LOCK, UNLOCK or
TRUCK switch. Check key unlock warning switch.

ON
Room light
OFF (2) is output.
(All room light response
0.13 sec.0.5 sec. is same.)

Recognition code registration function check:

(2) Incompatibility of the recognition code or out Check that it is possible to enter into
from synchronization of rolling code. rewrite mode or add mode.
(Refer to ”Wireless door lock receiver and
ON
Room Light transmitter” - ”Recognition code registration”.)
OFF

While receiving
<Reference>:
While turning the ignition switch ON in the self Wireless door lock operates
diagnostic mode, the mode returns to normal mode. normally when recognition code
is registered.

No response from room light

(1) is output.

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BE-134
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

Yes
The wave reaching range check: Other body control system faulty.
(Transmitter and receiver are normal.)
Is the wave reaching range normal?
(1 M area around vehicle)
(While the transmitting switch is pressed,
(approx. 20 secs.) the room light chirps continu-
ously. After 20 secs., repress the switch again.)
When pressing each switch of
No the new or normal transmitter
used in the same type vehicle,
check that all room light
Transmitter faulty or wireless door lock receiver in the same way.
faulty.
<Reference>
No Yes
Check the wave reaching range with another
transmitter (normal). When the range is normal,
transmitter defection is detected, the range is
not normal, wireless door lock receiver defection Transmitter faulty.
is detected.

Wireless door control receiver check:

Check the diagnosis. (wireless door lock signal error)
(Refer to ”Multiplex communication system”)

Using SST, connect terminal Tc and E1 of DLC1.

Yes
Wire harness faulty (short circuit)
Check that diagnostic code 42 is output.
Between the receiver terminal 2 (RDA) and
No body ECU terminal B7-2 (RDA).

No
Check RDA terminal circuit. RDA terminal open circuit.
Check that the voltage of RDA is 6.5 to 14 V
(with transmitting).

Yes

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 BE-135
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

No
Wire harness faulty (open circuit)
Check PRG terminal circuit
Between the receiver terminal 3 (PRG) and
Check that the voltage of PRG is 10 to 14 V body ECU terminal B7-1 (PRG).
(with transmitting).

Yes

No
ECU-B1 and MPX-B, or P FR DOOR fuse
+B power source check:
or wire harness faulty.
Check that there is constantly10 to 14 V voltage at the
connector terminal 1 (+B) of wireless door control
receiver.
Yes

No
Body ground check: Wire harness faulty.
Body ground open and contact error.
Check that continuity exists between the connector
terminal 5 (GND) of the wireless door control receiver
and body ground.
Yes

Wireless door control receiver faulty.

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BE-136
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM
BE1WW-02

INSPECTION
1. INSPECT WIRELESS DOOR LOCK TRANSMITTER
OPERATION
HINT:
Refer to ”Wireless door lock control transmitter battery replace-
ment” on page BE-140 .
(a) Using a screwdriver, remove the screw and cover.
(b) Remove the battery (lithium battery).

(c) Install a new or normal battery (lithium battery).

HINT:
When a new or normal battery can not be obtained, connect 2
new 1.5 V batteries in series, connect the battery (+) to the bat-
tery receptacle side terminal and battery (-) to the bottom termi-
nal, then apply 3 V voltage to the transmitter.
(d) In the location where is approx. 1 M away from driver’s
outside handle in the right direction, face the key plate of
I04149 the transmitter to the vehicle, and check the transmitter
operation when pressing transmission switch on the side
of the transmitter body.
Standard:

Remote control of vehicle door lock can be operated.

LED lights up more than once.
HINT:

The minimum operation distance differs according to op-
erator, the way of holding the transmitter, and location.

As weak wave is used, operation distance might be short-
ened when noise is detected in strong wave or used fre-
quency.
(e) Install the battery (lithium battery).
(f) Install a cover so that O-ring is not distorted or slipped off.
(g) Using a screwdriver, tighten the screw.

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 BE-137
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

2. CHECK BATTERY CAPACITY

HINT:

Make sure to use the LEXUS electrical tester.

With the battery unloaded, judge can not be made wheth-
er the battery is available or not on the test.

When the transmitter is faulty, the energy amount left in
the battery might not be checked correctly.

On the lithium battery used for the transmitter, the voltage
more than 2.5 V with the battery unloaded is shown on the
tester until the energy is completely consumed.
Accordingly when inspecting the energy amount left in the
battery, it is necessary to measure the voltage when the
battery is loaded. (1.2 kΩ).

(a) Remove the screws and cover using a (-) driver.

(b) Remove the battery (lithium battery) from the transmitter.
(c) Connect the lead to the (-) terminal of the transmitter and
install the battery.

I04150

(d) Connect the (+) tester to the (+) battery (lithium battery),
and (-) tester to the lead respectively.
(e) Press one of the transmitting switches on the transmitter
for approx. 1 second.
(f) Press the transmitting switch on the transmitter again to
check the voltage.
Standard: 2.1 V or more

I04151

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BE-138
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

HINT:

When the temperature of the battery is low, the judge can
not be made correctly.
When the outcome of the test is less than 2.1 V, conduct
the test again after leaving the battery in the place at 18
°C for more than 30 minutes.

By auto power off function, the voltage becomes no load
voltage (more than 2.5 V) condition 0.8 seconds after the
switch was pressed.
Make sure to read the voltage before of it.

High voltage might be shown 1 to 2 times after leaving the
battery, judge should be made with the voltage shown at
the 3rd time or later.
(g) Disconnect the lead.
(h) Set the battery (lithium battery) in the transmitter.
(i) Install the cover, so that the O-ring is not distorted or
slipped off.
(j) Using a screwdriver, tighten the screws.

3. INSPECT WIRELESS DOOR LOCK BUZZER OPERA-

2 1 TION
Connect the positive (+) lead from the ohmmeter to terminal 1
and the negative (-) lead to terminal 2, and measure resistance
of approx. 1 kΩ.
If resistance is not as specified, replace the buzzer.
4. INSPECT WIRELESS DOOR LOCK BUZZER CIRCUIT
(See page DI-945 )
N13471

Wire Harness Side 5. Connector disconnected:

INSPECT WIRELESS DOOR LOCK CONTROL RE-
CEIVER CIRCUIT (See page DI-905 )
Disconnect the connector from the receiver and inspect the
1 2 3 4 5 connector on the wire harness side, as shown.

I11391

Tester connection Condition Specified condition

1 - Ground Always Continuity
5 - Ground Always Battery Positive Voltage

If the circuit is not as specified, inspect the circuits connected

to other parts.

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 BE-139
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

6. Connector connected:
INSPECT WIRELESS DOOR LOCK CONTROL RE-
CEIVER CIRCUIT
Connect the wire harness side connector to the receiver and in-
spect the wire harness side connector from the back side, as
shown.
Tester connection Condition Specified condition
3 - Ground Always Battery Positive Voltage
All door closed
2 - Ground 0V-6V→0V
Transmitter OFF → ON

If circuit is as specified, replace the receiver.

If the circuit is not as specified, inspect the circuits connected
to other parts.

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BE-140
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM
BE0GP-17

REPLACEMENT
1. REPLACE TRANSMITTER (LITHIUM) BATTERY
NOTICE:
Special caution should be taken for handling each compo-
nent as they are precision electronic components.
(a) Using a screwdriver, remove the screw and cover.
NOTICE:
Do not pry out the cover forcibly.
I09962
HINT:
Push the cover with a finger as shown in the illustration, so that
there becomes clearance, then pry out the cover from that
clearance.
(b) Remove the transmitter.

(c) Using a screwdriver, remove the 2 screws and cover.

(d) Remove the battery (lithium battery).
NOTICE:
 Do not push the terminals with a finger.
Oring
 If prying up the battery (lithium battery) forcibly to re-
move, the terminals are deformed.

I04155

(e) Install a battery (lithium battery) as shown in the illustra-

Terminal
tion.
NOTICE:
Face the battery upward. Take care not to deform the termi-
nals.
(f) Check that O-ring is not distorted or slipped off, and
install the cover.
(g) Using a screwdriver, tighten the 2 screws.
I04156 NOTICE:
When the shrews are tightened loosely, it might cause
faulty contact of battery (lithium battery) and terminals.
(h) Assemble the transmitter to the key plate and the cover.
(i) Using a screwdriver, tighten the screw.

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 BE-141
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

2. REPLACE DOOR CONTROL RECEIVER AND TRANS-

MITTER
NOTICE:
When replacing the door control receiver and transmitter,
registration of recognition code is necessary because they
are provided as single components.
(a) Select which operation mode should be performed from
the following modes.
 Add mode
 Rewrite mode
 Prohibition mode
 Confirmation mode
HINT:
 The add mode is used to retain codes already registered
while you register new recognition codes. This mode is
used when adding a transmitter. However, if the number
of registered codes exceeds 4 codes, previously regis-
tered codes are correspondingly erased in order, starting
from the first registered code.
 The rewrite mode is used to erase all previously regis-
tered codes and register only new recognition codes.
 The prohibition mode is used to erase all registered codes
and cancels the wireless door lock function. Use this
mode when the transmitter is lost.
 The confirmation mode is for confirming how many recog-
nition codes are already registered before you register
additional recognition codes.
(b) Follow the chart on the following pages to register the
transmitter recognition code at the wireless door lock con-
trol receiver.
HINT:
 When procedure is out of the specified, the operation re-
turns to normal operation.
 Maximum 4 recognition codes can be registered.

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BE-142
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

Start registration of recognition code

The vehicle should be in the following conditions.

The key is not inserted in the ignition key cylinder.

Driver’s door is OPEN. (Other doors are CLOSED)

Driver’s door is UNLOCKED.

Insert the key into the ignition key cylinder, then pull it out.

Press the door lock control switch (for manual operation) 5 times to
LOCK/UNLOCK at approx. 1 sec. interval.
1st time 2nd time 3rd time 4th time 5th time

Approx. Approx.
Within 1 sec. 1 sec.
LOCK
40 secs.
OFF

UNLOCK

Close the driver’s door, then open it.

Again press the door lock control switch (for manual operation) 5 times to
LOCK/UNLOCK at approx. 1 sec. interval.
1st time 2nd time 3rd time 4th time 5th time

Approx. Approx.
LOCK 1 sec. 1 sec.

Within OFF
40 secs.
UNLOCK

Insert the key into the ignition key cylinder.

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 BE-143
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

Turn the ignition switch from ON to LOCK at approx. 1 sec. interval 1 to 5 times to select the mode.

Add mode Confirmation mode

ON - LOCK change occurs 1 time ON - LOCK change occurs 3 times

Approx. Approx.
Approx. 1 sec. 1 sec. 1 sec.
ON ON

LOCK LOCK

Rewrite mode Prohibition mode

ON - LOCK change occurs 2 times ON - LOCK change occurs 5 times

Approx. Approx. Approx. Approx.
1 sec. 1 sec. 1 sec. 1 sec.
ON ON

LOCK LOCK

Pull out the key plate from the ignition key cylinder.
When add mode or rewrite mode When prohibition When confirmation
is selected. mode is selected. mode is selected.

MPX body ECU automatically performs MPX body ECU automatically performs the
the LOCK-UNLOCK operation once LOCK-UNLOCK operation 1 to 4 times at
or twice at 1 sec. interval to inform the 2 sec. interval to inform the operator of
operator that either the add mode or the number of the registered codes.
rewrite mode has been selected. HINT:
When the number of the registered code
LOCK-UNLOCK occurs once
is 0, the operation is automatically
Within Indicates that add mode has been selected. performed 5 times.
3 secs.
1 sec. Example:
LOCK When the operation is performed twice, it
UNLOCK directs that 2 types of recognition code
have been registered.
LOCK-UNLOCK occurs twice 1st time 2nd time
Indicates that rewrite mode has been
2 secs. 2 secs.
selected.
LOCK
1 sec. 1 sec.
UNLOCK
LOCK
UNLOCK

Registration of recognition code (Confirmation

mode and prohibition mode) is completed.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2144

BE-144
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM

When prohibition
mode is selected.
Within MPX body performs LOCK-UNLOCK operation 5 times at a 1 sec.
40 secs. interval to inform the operator that prohibition mode has been selected.

Approx. Approx.
1 sec. 1 sec.

LOCK

UNLOCK

Press the lock and unlock switches on the transmitter simultaneously

within. 1.5 sec.

Within
3 secs.
Press again either one of 3 switches on the transmitter for more than 1 sec.

MPX body ECU automatically performs LOCK-UNLOCK operation once or

twice at a 1 sec. interval to inform the operator that the receiver has received the
signal from the transmitter.
Within LOCK-UNLOCK occurs once
3 secs. Registration of recognition code is completed

LOCK-UNLOCK occurs twice

Registration of recognition code has not been completed.

Recognition code received first time and second time did not match.

If LOCK-UNLOCK operation can not be performed at all, the mode returns to the
normal mode, then start with ”Start registration of recognition code”.

Proceed to finish registration Proceed to continue registration

Within 40 secs.

If even one of the following conditions is satisfied, registration of recognition

codes is completed.

40 secs. elapses since the MPX body ECU response.

The driver’s door is closed.

The key plate is inserted in the ignition key cylinder.

4 type recognition codes are registration at one time.

Registration of recognition codes (add mode or rewrite mode) is completed.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2145

 BE-145
BODY ELECTRICAL - SLIDING ROOF SYSTEM

SLIDING ROOF SYSTEM

BE0O9-08

TROUBLESHOOTING

1 Sliding Roof does not stop at correct position.

Start Power Supply was disconnected during use of sliding roof.

Motor was manually rotated.

*Reinitialize End

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2146

BE-146
BODY ELECTRICAL - SLIDING ROOF SYSTEM

2 Sliding Roof always reopens (anti trap function).

Start

Increase the face by running the sliding roof again manually by pushing and holding the switch within
10 sec.( Try max 3 times )
When the sliding roof starts reversing ( Resistance becomes greater due to the deformation of seal.),
press the switch and hold it. So reverse force increases, then the sliding roof can be closed.
First time : Reverse with force of 100N
Second time : Reverse with force of 150N
Third time : No jam protection function
* Press the switch within 10 seconds after the roof has started reversing.
Otherwise, sliding roof ECU returns to the un initialized condition.

No
Failure found ? Check mechanic

Yes

*Reinitialize
When the sliding roof does not stop at the normal position, ever
though the above operations have been performed, resetting is nec-
essary.

End

*Reinitializing method
(a) Move the sliding roof to the maximum tilted position.
(b) Release the switch, press the switch again and hold it for 10 secs.
(c) The sliding roof operates in a cycle of TILT DOWN → SLIDE OPEN → SLIDE CLOSE → TILT UP.
THis completes reinitializing.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2147

 BE-147
BODY ELECTRICAL - SLIDING ROOF SYSTEM

SLIDING ROOF SYSTEM

BE05Q-07

LOCATION
Sedan:
Sliding Roof Control Assembly

Sliding Roof ECU

Sliding Roof Motor
Front Personal Light

Sliding Roof Switch

Door Courtesy Switch

Wagon:

Sliding Roof Control Assembly

Sliding Roof ECU

Sliding Roof Motor

Front Personal Light

Sliding Roof Switch

Door Courtesy Switch

Driver Side J/B

S/ROOF Fuse

ECU-IG Fuse

Body ECU

Ignition Switch

I27826

Author
: Date
: 2148

BE-148
BODY ELECTRICAL - SLIDING ROOF SYSTEM
BE10K-05

INSPECTION
1. INSPECT SLIDING ROOF SWITCH CONTINUITY
Switch position Tester connection Specified condition
SLIDE OPEN 3-4 Below 10 Ω
Tilt Switch Slide Switch SLIDE OFF 3 - 4, 4 - 6 10k Ω or higher
3 2 1 SLIDE CLOSE 4-6 Below 10 Ω
6 5 4 TILT DOWN 2-4 Below 10 Ω

I01262 TILT OFF 2 - 4, 4 - 5 10k Ω or higher

TILT UP 4-5 Below 10 Ω
If continuity is not as specified, replace the front personal light
(sliding roof switch).

2. INSPECT SLIDING ROOF CONTROL ASSEMBLY CIR-

Wire Harness Side CUIT
Disconnect the connector from the sliding roof control assembly
and inspect the connector on the wire harness side, as shown
in the chart below.

I04045

Tester connection Condition Specified condition

5 - Ground Sliding roof control switch (TILT) UP Below 100 Ω
6 - Ground Sliding roof control switch (TILT) DOWN Below 100 Ω
1 - Ground Sliding roof control switch (SLIDE) CLOSE Below 100 Ω
2 - Ground Sliding roof control switch (SLIDE) OPEN Below 100 Ω
8, 7 - Ground Always Below 1 V
10 - Ground Front door is opened Below 1 Ω
3 - Ground Ignition switch LOCK or ACC Below 2 V
3 - Ground Ignition switch ON 10 to 14 V
4 - Ground Always 10 to 14 V
If the circuit condition is as specified, replace the sliding roof
control assembly.

Author
: Date
: 2149

 BE-148-1
BODY ELECTRICAL - SLIDING ROOF SYSTEM

3. CHECK AUTO SLIDE-OPEN/CLOSE OPERATION

NOTICE:
If the sliding roof system has not been initialized, then AUTO slide open/close operation does not
work.
HINT:
Initialize the sliding roof system after any of the following is done:

The battery is disconnected.

The S/ROOF fuse is replaced.

The sliding roof assembly (sliding roof ECU) is replaced.

The sliding roof is removed and then reinstalled or replaced.
(a) Initialize the sliding roof system.
(1) Turn the ignition switch to the ON position.
(2) Using the tilt switch, tilt the roof fully upward, and then fully downward.
(3) Using the slide switch, fully open the roof, and then fully close it.
(b) Check AUTO slide-open operation.
(1) Turn the ignition switch to the ON position.
(2) If the roof glass is not fully closed, slide or tilt it so that it is fully closed.
(3) Press the sliding roof OPEN switch for 0.3 seconds or more. The roof glass should automatically
slide open and stop slightly before the fully open position.
(c) Check the AUTO slide-close operation.
(1) Turn ignition switch to the ON position.
(2) Press the sliding roof CLOSE switch for 0.3 seconds or more. The roof glass should automatically
close.
(3) If the CLOSE, OPEN, UP, or DOWN switch is pressed while the roof glass is in motion, the roof
glass will stop moving.
(4) If the roof glass cannot be fully closed using AUTO operation (opens due to the jam protection
function):

Visually check if there is any foreign object between the sliding roof rail and the sliding roof glass.

Check if the alignment of the sliding roof glass is within the specified range (see page BO-126 ).
If no problems are found with the above checks, then perform the following operation to fully close the
roof glass forcibly and check if AUTO operation return to normal. (Forced operation)

Perform forced operation.*

Caution:
The jam protection function does not operate during forced operation.
Be careful not to get any part of your body caught between the vehicle body and the roof glass.
*: Pressing and holding the CLOSE switch inhibits the jam protection function approx.10 sec. after
starting the reverse operation.
If the switch is kept pressed, the sliding roof starts close operation and stops when detecting the fully
closed position.

SLIDE SWITCH ON
(CLOSE)
OFF
Forced Operation
Close Reverse Stop (Close) Stop
Roof Operation

Approx. 10 sec. Fully Closed Position

If the roof glass does not operate normally even after performing above procedures, then replace the sliding
roof control assembly.

Author
: Date
: 2150

BE-148-2
BODY ELECTRICAL - SLIDING ROOF SYSTEM

4. CHECK AUTO TILT-UP/DOWN OPERATION

NOTICE:
If the sliding roof system has not been initialized, then AUTO slide tilt-up/down operation does not
work.
HINT:
Initialize the sliding roof system after any of the following is done:

The battery is disconnected.

The S/ROOF fuse is replaced.

The sliding roof assembly (sliding roof ECU) is replaced.

The sliding roof is removed and then reinstalled or replaced.
(a) Initialize the sliding roof system.
(1) Turn the ignition switch to the ON position.
(2) Using the tilt switch, tilt the roof fully upward, and then fully downward.
(3) Using the slide switch, fully open the roof, and then fully close it.
(b) Check AUTO tilt-up operation.
(1) Turn the ignition switch to the ON position.
(2) If the roof glass is not fully closed, slide or tilt it so that it is fully closed.
(3) Press the sliding roof UP switch for 0.3 seconds or more. The roof glass should automatically
tilt upward until it is fully open.
(c) Check the AUTO tilt-down operation.
(1) Turn the ignition switch to the ON position.
(2) When the roof glass is fully tilted upward, press the sliding roof DOWN switch for 0.3 seconds
or more. The roof glass should automatically tilt downward until it is fully closed.
(3) If the CLOSE, OPEN, UP, or DOWN switch is pressed while the roof glass is in motion, the roof
glass will stop moving.
(4) If the roof glass cannot be fully tilted using AUTO operation (opens due to the jam protection func-
tion):

Visually check if there is any foreign object between the sliding roof rail and the sliding roof glass.

Check if the alignment of the sliding roof glass is within the specified range (see page BO-126 ).
If no problems are found with the above checks, then perform the following operation to fully down the
roof glass forcibly and check if AUTO operation return to normal. (Forced operation)

Perform forced operation.*

Caution:
The jam protection function does not operate during forced operation.
Be careful not to get any part of your body caught between the vehicle body and the roof glass.
*: Pressing and holding the DOWN switch inhibits the jam protection function approx.10 sec. after
starting the reverse operation.
If the switch is kept pressed, the sliding roof starts down operation and stops when detecting the fully
down position.

TILT SWITCH ON
(DOWN)
OFF
Forced Operation
Down Reverse Stop (Down) Stop
Roof Operation

Approx. 10 sec. Fully Down Position

If the roof glass does not operate normally even after performing above procedures, then replace the sliding
roof control assembly.

Author
: Date
: 2151

 BE-148-3
BODY ELECTRICAL - SLIDING ROOF SYSTEM

5. CHECK KEY-OFF SLIDING ROOF OPERATION

HINT:
The sliding roof can be operated for approximately 45 seconds after the ignition switch is turned from ON
to OFF with all doors closed. However, if the driver side door is opened during this time, the operation is can-
celed.
(a) Check the sliding roof operation function after the ignition switch is turned from ON to OFF.
(1) Turn the ignition switch from ON to OFF. Sliding roof AUTO operation should be possible. Howev-
er, opening either of the front doors should disable AUTO operation.
(2) Turn the ignition switch from ON to OFF. Wait approximately 45 seconds. AUTO operation should
be prohibited.
(3) Turn the ignition switch from ON to OFF with either of the front doors open. AUTO operation
should immediately stop functioning.
If operation is not as specified, then inspect each part following the problem symptom table
(see page BE-2 ).
6. CHECK JAM PROTECTION FUNCTION
HINT:
When sliding roof AUTO operation is being used, the jam protection function prevents objects from being
caught between the vehicle body and the roof glass.
Operative condition:

AUTO CLOSE with ignition switch ON.

AUTO CLOSE during sliding operation after the ignition switch is turned OFF.

AUTO TILT-DOWN with ignition switch ON.

AUTO TILT-DOWN during sliding operation after the ignition switch is turned OFF.
CAUTION:

Do not use any part of your body such as your hand, or any object to check the jam protection
function. Do not allow anything to become caught in the sliding roof by accident during this
procedure.

The jam protection function may not work against an object less than 5 mm (0.20 in.) in width.

(a) When sliding roof AUTO operation is being used:

check that the roof glass should open a distance of 200
mm (7.87 in.) from the point of contact with the object, or
fully open if 200 mm (7.87 in.) of opening distance is not
available when an object is caught between the vehicle
body and the roof glass.

I29064

(b) When the tilt-down operation is being used:

Check that the sliding roof fully tilts up when an object is
caught between the vehicle body and the roof glass.
If operation is not as specified, then replace the sliding roof con-
trol assembly.

I29065

Author
: Date
: 2152

 BE-149
BODY ELECTRICAL - POWER SEAT CONTROL SYSTEM

POWER SEAT CONTROL SYSTEM

BE0GK-11

LOCATION

Driver Side Junction Block

P SEAT (D) Fuse

Power Seat Memory Switch

Reclining Motor

Lifter Motor

Power Seat Switch Power Seat Contol ECU

Reclining Motor

Front Vertical Motor

Slide Motor
Front Vertical Motor Power Seat Switch

I27827

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2153

BE-150
BODY ELECTRICAL - POWER SEAT CONTROL SYSTEM
BE2JV-01

Reclining INSPECTION
Forward Rear 1. INSPECT DRIVER’S POWER SEAT SWITCH CONTI-
NUITY
Slide switch:
Switch position Tester connection Specified condition

Front Back 1-9

FRONT Continuity
4-6
Front Vertical Lifter 4-6
Up Up OFF Continuity
4-9

1-6
BACK Continuity
4-9

Front vertical switch:

Down Down
Switch position Tester connection Specified condition
1 - 10
UP Continuity
4 - 5 (*1)

4 - 5 (*1)
OFF Continuity
4 - 10 (*1)
1-5
I04159 DOWN Continuity
4 - 10 (*1)

Lifter switch:
Switch position Tester connection Specified condition
1-7
UP Continuity
4 - 8 (*1)

4 - 7 (*1)
OFF Continuity
4 - 8 (*1)

1-8
DOWN Continuity
4 - 7 (*1)

Reclining switch:
Switch position Tester connection Specified condition
1-3
FORWARD Continuity
2-4

2-4
OFF Continuity
3-4
1-2
REAR Continuity
3-4

*1: w/ power seat memory switch

If continuity is not as specified, replace the switch.

2. INSPECT POWER SEAT MEMORY SWITCH

Switch position Tester connection Specified condition
SET 1-4 Continuity
SW1 2-4 Continuity
SW2 3-4 Continuity
4 3 2 1

I27321
2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2154

 BE-151
BODY ELECTRICAL - POWER SEAT CONTROL SYSTEM

3. INSPECT DRIVER’S POWER SEAT SWITCH CIRCUIT

Wire Harness Side
(a) Disconnect the switch connector and connect the seat
wire harness to the floor wire harness.
(b) Inspect the connector on the wire harness side.

I05472

w/o Power seat memory switch:

Tester connection Condition Specified condition
4 - Ground Always Continuity
1 - Ground Always Battery Positive Voltage
w/ Power seat memory switch:
Tester connection Condition Specified condition
1 - Ground Always Continuity
If circuit is not as specified, inspect the circuits connected to oth-
er parts.
Reclining 4. INSPECT PASSENGER’S POWER SEAT SWITCH
Rear Forward CONTINUITY
Slide switch:
Switch position Tester connection Specified condition
1-9
FRONT Continuity
4-6
Back Front
4-6
OFF Continuity
Lifter Front Vertical 4-9
Up Up 1-6
BACK Continuity
4-9

Front vertical switch:

Switch position Tester connection Specified condition
Down Down 1-5
UP Continuity
4 - 10

4-5
OFF Continuity
4 - 10
1 - 10
DOWN Continuity
4-5
I04160
Lifter switch:
Switch position Tester connection Specified condition
1-8
UP Continuity
4-7

4-7
OFF Continuity
4-8

1-7
DOWN Continuity
4-8

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2155

BE-152
BODY ELECTRICAL - POWER SEAT CONTROL SYSTEM

Reclining switch:
Switch position Tester connection Specified condition
1-3
FORWARD Continuity
2-4

2-4
OFF Continuity
3-4

1-2
REAR Continuity
3-4

If continuity is not as specified, replace the switch.

5. INSPECT PASSENGER’S POWER SEAT SWITCH CIR-

Wire Harness Side
CUIT
(a) Disconnect the switch connector and connect the seat
wire harness to the floor wire harness.
(b) Inspect the connector on the wire harness side.

I05472

Tester connection Condition Specified condition

4 - Ground Always Continuity
1 - Ground Always Battery positive voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

(a) (b) 6. INSPECT SLIDE MOTOR OPERATION

(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (-) lead to terminal 2, check that the
2 1 2 1 motor turns counterclockwise.
(b) Reverse the polarity, check that the motor turns clock-
wise.
If operation is not as specified, replace the seat adjuster.

N21865

1
7. INSPECT SLIDE MOTOR PTC THERMISTOR OPERA-
2
TION
(a) ( ): Passenger side
Connect the positive (+) lead from the battery to terminal
1 (2), the positive (+) lead from the ammeter to terminal
2 (1) and the negative (-) lead to the battery negative (-)
terminal, then move the seat cushion to the front position.
(b) Continue to apply voltage, check that current changes to
N21866 less than 1 ampere within 4 to 90 seconds.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2156

 BE-153
BODY ELECTRICAL - POWER SEAT CONTROL SYSTEM

(c) Disconnect the leads from terminals.

2 1
(d) Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 2 (1) and the negative (-)
lead to terminal 1 (2), check that the seat cushion begins
to move backwards.
If operation is not as specified, replace the seat adjuster.

N21867

(a) (b)
8. INSPECT FRONT VERTICAL MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (-) lead to terminal 2, check that the
2 1 2 1 motor turns counterclockwise.
(b) Reverse the polarity, check that the motor turns clock-
wise.
If operation is not as specified, replace the seat adjuster.

N21865

1
9. INSPECT FRONT VERTICAL MOTOR PTC THERM-
2
ISTOR OPERATION
(a) ( ): Passenger side
Connect the positive (+) lead from the battery to terminal
1 (2), the positive (+) lead from the ammeter to terminal
2 (1) and the negative (-) lead to the battery negative (-)
terminal, then move the seat cushion to the highest posi-
tion.
N22086 (b) Continue to apply voltage, check that the current changes
to less than 1 ampere within 4 to 90 seconds.
(c) Disconnect the leads from the terminals.
2 1
(d) Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 2 (1) and the negative (-)
lead to terminal 1 (2), check that the seat cushion begins
to descend.
If operation is not as specified, replace the seat adjuster.

N22087

(a) (b) 10. INSPECT LIFTER MOTOR OPERATION

(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (-) lead to terminal 2, check that the
2 1 2 1 motor turns counterclockwise.
(b) Reverse the polarity, check that the motor turns clock-
wise.
If operation is not as specified, replace the seat adjuster.

N21865

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2157

BE-154
BODY ELECTRICAL - POWER SEAT CONTROL SYSTEM

11. INSPECT LIFTER MOTOR PTC THERMISTOR OPERA-

2 1
TION
(a) ( ): Passenger side
Connect the positive (+) lead from the battery to terminal
1 (2), the positive (+) lead from the ammeter to terminal
2 (1) and the negative (-) lead to the battery negative (-)
terminal, then move the seat cushion to the highest posi-
tion.
I11550 (b) Continue to apply voltage, check that the current changes
to less than 1 ampere within 4 to 90 seconds.
(c) Disconnect the leads from the terminals.
(d) Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 2 (1) and the negative (-)
lead to terminal 1 (2), check that the seat cushion begins
2 to descend.
If operation is not as specified, replace the seat adjuster.
1

I11551

(a) (b)
12. INSPECT RECLINING MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (-) lead to terminal 2, check that the
2 1 2 1 motor turns counterclockwise.
(b) Reverse the polarity, check that the motor turns clock-
wise.
If operation is not as specified, replace the seat adjuster.

N21865

13. INSPECT RECLINING MOTOR PTC THERMISTOR OP-

2 1
ERATION
(a) Connect the positive (+) lead from the battery to terminal
2, the positive (+) lead from the ammeter to terminal 1 and
the negative (-) lead to the battery negative (-) terminal,
then recline the seat back to the most forward position.
(b) Continue to apply voltage, check that the current changes
to less than 1 ampere within 4 to 90 seconds.
N21868

(c) Disconnect the leads from the terminals.

2 1
(d) Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 1 and the negative (-)
lead to terminal 2, check that the seat back begins to fall
backward.
If operation is not as specified, replace the seat adjuster.

N21869

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2158

 BE-155
BODY ELECTRICAL - POWER SEAT CONTROL SYSTEM

14. INSPECT POWER SEAT CONTROL ECU

(a) Check power seat control ECU with connector A and B
still connected.

B A

4 3 2 1 13 2 1
12 11 10 9 8 7 6 5 4 3
25 15 14
10 9 8 7 6 5 2423222120 19181716

I27320

Symbols (Terminal No.) Condition Specified condition

PKB (A-1) - Body ground Parking brake switch ON Blow 2 V
P (A-2) - Body ground Neutral position switch is P 10-14 V
SSRS (A-3) - Body ground Slide position sensor OFF → ON Blow 2 V → 6.6 V or higher
SSFV (A-4) - Body ground Front vertical sensor OFF → ON Blow 2 V → 6.6 V or higher
PCVV (A-5) - Body ground Ignition switch ON Blow 8 V
SLDF (A-6) - Body ground Manual switch (Front slide) OFF → ON 1 kΩ or higher → Below 10 Ω
SLDR (A-8) - Body ground Manual switch (Rear slide) OFF → ON 1 kΩ or higher → Below 10 Ω
MMRY (A-9) - Body ground Memory switch OFF → ON 10 kΩ or higher → Below 100 Ω
RCLF (A-10) - Body ground Manual switch (Rear reclining) OFF → ON 1 kΩ or higher → Below 10 Ω
RDWN (A-11) - Body ground Manual switch (Rear vertical down) OFF → ON 1 kΩ or higher → Below 10 Ω
RCLR (A-12) - Body ground Manual switch (Front reclining) OFF → ON 1 kΩ or higher → Below 10 Ω
IG (A-13) - Body ground Ignition switch ON 10-14 V
SI (A-14) Communication line -
DCTY (A-15) - Body ground Door courtesy switch OFF → ON 10 kΩ or higher → Below 100 Ω
SSRR (A-16) - Body ground Reclining position sensor OFF → ON Blow 1 V → Blow 2 V
SSRV (A-17) - Body ground Rear vertical sensor OFF → ON Blow 2 V → 6.6 V or higher
SGND (A-19) - Body ground Always Blow 1 Ω
SW2 (A-20) - Body ground Memory switch OFF → ON 10 kΩ or higher → Below 100 Ω
SW1 (A-21) - Body ground Memory switch OFF → ON 10 kΩ or higher → Below 100 Ω
RUP (A-22) - Body ground Manual switch (Rear vertical up) OFF → ON 1 kΩ or higher → Below 10 Ω
FUP (A-23) - Body ground Manual switch (Front vertical up) OFF → ON 1 kΩ or higher → Below 10 Ω
FDWN (A-24) - Body ground Manual switch (Front vertical down) OFF → ON 1 kΩ or higher → Below 10 Ω
RCL- (B-1) - Body ground Manual switch (Rear reclining) OFF → ON Blow 1 V → 10-14 V
RCL+ (B-2) - Body ground Manual switch (Front reclining) OFF → ON Blow 1 V → 10-14 V
SLD- (B-3) - Body ground Manual switch (Rear slide) OFF → ON Blow 1 V → 10-14 V
SLD+ (B-4) - Body ground Manual switch (Front slide) OFF → ON Blow 1 V → 10-14 V
RRV- (B-5) - Body ground Manual switch (Rear vertical down) OFF → ON Blow 1 V → 10-14 V
RRV+ (B-6) - Body ground Manual switch (Rear vertical up) OFF → ON Blow 1 V → 10-14 V

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2159

BE-156
BODY ELECTRICAL - POWER SEAT CONTROL SYSTEM

GND (B-7) - Body ground Always Blow 1 Ω

+B (B-8) - Body ground Always 10-14 V
FRV- (B-9) - Body ground Manual switch (Front vertical down) OFF → ON Blow 1 V → 10-14 V
FRV+ (B-10) - Body ground Manual switch (Front vertical up) OFF → ON Blow 1 V → 10-14 V

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2160

 BE-157
BODY ELECTRICAL - POWER MIRROR CONTROL SYSTEM

POWER MIRROR CONTROL SYSTEM

BE02J-17

LOCATION

Mirror Assembly

Mirror Motor

Passenger Side
Junction Block

MIR HTR Relay
Ignition Switch

MIR HTR Fuse

Power Window Driver Side Junction Block

Master Switch
RADIO No.2 Fuse

Power Mirror Switch

I27828

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2161

BE-158
BODY ELECTRICAL - POWER MIRROR CONTROL SYSTEM
BE1X6-01

INSPECTION
Left/Right Adjustment 1. Left/right adjustment switch (Left side):
Switch INSPECT MIRROR SWITCH CONTINUITY
Switch position Specified condition
1 - 10
UP
3-4

1-3
RIGHT
9-4
MIRROR CONTROL SWITCH I18581
1-3
DOWN
10 - 4

1-9
LEFT
3-4

If continuity is not as specified, replace the switch.

2. Left/right adjustment switch (Right side):
INSPECT MIRROR SWITCH CONTINUITY
Switch position Specified condition
1-6
UP
3-4

1-3
RIGHT
2-4

1-3
DOWN
6-4

1-2
LEFT
3-4

If continuity is not as specified, replace the switch.

3. INSPECT MIRROR MOTOR OPERATION

Mirror side
(a) Connect the positive (+) lead from the battery to terminal
8 and the negative (-) lead to terminal 7, and check that
the mirror turns to the upward.
1 2
(b) Reverse the polarity, and check that the mirror turns to the
3 4 5 6 7 8 downward.
(c) Connect the positive (+) lead from the battery to terminal
6 and the negative (-) lead to terminal 7, and check that
I11404 the mirror turns to the inside.
(d) Reverse the polarity, and check that the mirror turns out-
side.
If operation is not as specified, replace the mirror assembly.

2005 LEXUS IS300 (RM1140U)

Author
: Date
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 BE-159
BODY ELECTRICAL - ELECTRO CHROMIC MIRROR SYSTEM

ELECTRO CHROMIC MIRROR SYSTEM

BE0HC-13

LOCATION

Electro Chromic Outer Mirror

Electro Chromic Inner Mirror

Driver Side Junction Block

ECU-IG Fuse

I27829

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BE-160
BODY ELECTRICAL - ELECTRO CHROMIC MIRROR SYSTEM
BE2A7-02

INSPECTION
1. INSPECT ELECTRO CHROMIC INNER MIRROR OP-
4 2
1 ERATION
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (-) lead to terminal 4.
(b) Connect the positive (+) lead from the voltmeter to termi-
3 nal 2 and the negative (-) lead to terminal 3.
(c) Attach a black coloured tape to forward sensor to prevent
it from sensing.
(d) When the mode is turned to AUTO, check that indicator
light lights up.
(e) Light up the mirror with an electric light, and check that
there is battery positive voltage and mirror surface
changes ”bright” to ”dark”.
Black coloured tape If operation is not as specified, replace the inner mirror.

”Bright” ”Dark”

I23215

2. INSPECT ELECTRO CHROMIC INNER MIRROR CIR-

Wire Harness Side
CUIT
Disconnect the connector from the mirror and inspect the con-
nector on the wire harness side, as shown.

I23216

Tester connection Condition Specified condition

4 - Ground Always Continuity
1 - Ground Ignition switch LOCK or ACC No voltage
1 - Ground Ignition switch ON Battery positive voltage
If circuit is not as specified, inspect the circuits connected to
other parts.

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 BE-161
BODY ELECTRICAL - ELECTRO CHROMIC MIRROR SYSTEM

4 5
3. INSPECT ELECTRO CHROMIC OUTER MIRROR OP-
”Bright”
ERATION
(a) Disconnect the outer mirror connector.
(b) Connect the positive (+) lead from the dry cell battery to
terminal 4 and the negative (-) lead to terminal 5, then
”Dark”
check that the mirror surface changes to ”dark”.
(c) Check the mirror turns to ”bright” after disconnecting the
battery.
I23213 If operation is not as specified, replace the mirror assembly.

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BE-162
BODY ELECTRICAL - SEAT HEATER SYSTEM

SEAT HEATER SYSTEM

BE2A8-03

LOCATION

Driver Side Seat Heater Switch

Ignition Switch
Junction Block

S-HTR Fuse
Seat Heater Cushion Front Side

w/o Seatback table:

Seat Heater Cushion Rear Side

Seat Heater Back

I27830

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 BE-163
BODY ELECTRICAL - SEAT HEATER SYSTEM

Seat Heater Cushion Front Side

w/ Seatback table:

Seat Heater Cushion Rear Side

Seat Heater Back

I27831

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BE-164
BODY ELECTRICAL - SEAT HEATER SYSTEM
BE2F1-01

INSPECTION
1. INSPECT SEAT HEATER SWITCH CONTINUITY
Switch position Tester connection Specified condition
ON 2-3-6 Continuity
OFF - No continuity
Illumination circuit 1-4 Continuity

If continuity is not as specified, replace the switch.

e-6-2-H I10742

2. INSPECT SEAT HEATER INDICATOR LIGHT OPERA-

2 TION
(a) Connect the positive (+) lead from the battery to terminal
3 and the negative (-) lead to terminal 2.
(b) Push the seat heater switch ON that the indicator light
lights up.
3 If operation is not as specified, replace the switch and inspect
the circuits connected to other parts.
I11549

3. INSPECT SEAT HEATER CUSHION REAR SIDE CON-

to vehicle side connector ”A” TINUITY
(a) Heat the thermostat with a light.
1 2 (b) Inspect the seat heater cushion continuity between termi-
nals, as shown.

1 2

to seat cushion front

side connector ”B”

to seat back connector ”C”

1 2

I25926

Tester connection Condition Specified condition

A1 - B2 Seat heater temperature below 25 °C (77 °F) Continuity
A1 - B2 Seat heater temperature above 45 °C (113 °F) No continuity
A2 - B1 Always Continuity
A2 - C1 Always Continuity
B2 - C2 Always Continuity
If continuity is not as specified, replace the seat cushion pad.

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 BE-165
BODY ELECTRICAL - SEAT HEATER SYSTEM

4. INSPECT SEAT HEATER CUSHION CIRCUIT

Wire Harness Side
Disconnect the connector from the seat heater cushion and in-
spect the connector on wire harness side, as shown.

I25927

Tester connection Condition Specified condition

2 - Body ground Seat heater switch ON Battery Positive Voltage

If circuit is not as specified, inspect the wire harness.

5. INSPECT SEAT CUSHION FRONT SIDE CONTINUITY

Inspect the seat cushion front side continuity between termi-
nals, as shown.

I25927

Tester connection Condition Specified condition

1-2 Always Continuity
If continuity is not as specified, replace the seat cushion pad.

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BE-166
BODY ELECTRICAL - SEAT HEATER SYSTEM

6. INSPECT SEAT BACK CONTINUITY

Inspect the seat back continuity between terminals, as shown.

I25521

Tester connection Condition Specified condition

1-2 Always Continuity

If continuity is not as specified, replace the seat back pad.

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 BE-167
BODY ELECTRICAL - AUDIO SYSTEM

AUDIO SYSTEM
BE1X4-03

DESCRIPTION
1. RADIO WAVE BAND
The radio wave bands used in radio broadcasting are as follows:

Frequency 30 kHz 300 kHz 3 MHz 30 MHz 300 MHz

Designation LF MF HF VHF

LW AM (MW) SW FM (UKW)
Radio wave

Modulation Amplitude modulation Frequency modulation

LF: Low Frequency

MF: Medium Frequency
HF: High Frequency
VHF: Very High Frequency

2. SERVICE AREA
There are great differences in the size of the service area for AM
and FM monaural. Sometimes FM stereo broadcasts cannot be
received even through AM can be received in very clearly.
Not only does FM stereo have the smallest service area, but it
FM (Stereo) also picks up static and other types of interference (”noise”)
FM (Monaural) easily.
AM

BE2818

3. RECEPTION PROBLEMS
Besides the problem of static, there are also the problems
called ”fading”, ”multipath” and ”fade out”. These problems are
caused not by electrical noise but by the nature of the radio
waves themselves.

Fading  Fading
lonosphere
Besides electrical interference, AM broadcasts are
also susceptible to other types of interference, es-
pecially at night. This is because AM radio waves
bounce off the ionosphere at night. These radio
waves then interfere with the signals from the same
transmitter that reach the vehicle’s antenna directly.
This type of interference is called ”fading”.
BE2819

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BE-168
BODY ELECTRICAL - AUDIO SYSTEM

 Multipath
Multipath
One type of interference caused by the bounce of
radio waves off of obstructions is called ”multipath”.
Multipath occurs when a signal from the broadcast
transmitter antenna bounces off buildings and
mountains and interferes with the signal that is re-
ceived directly.

BE2820

 Fade Out
Fade Out Because FM radio waves are of higher frequencies
than AM radio waves, they bounce off buildings,
mountains, and other obstructions. For this reason,
FM signals often seem to gradually disappear or
fade away as the vehicle goes behind a building or
other obstruction. This is called ”fade out”.

BE2821

4. Tape Player/Head Cleaning:

Example :
MAINTENANCE
Head Capstan
(a) Raise the cassette door with your finger.
Next, using a pencil or similar object, push in the guide.
(b) Using a cleaning pen or cotton applicator soaked in clean-
er, clean the head surface, pinch rollers and capstans.

Pinch Roller N17398

5. CD Player/Disc Cleaning:
MAINTENANCE
If the disc gets dirty, clean the disc by wiping the surface from
the center to outside in the radial directions with a soft cloth.
NOTICE:
Do not use a conventional record cleaner or anti-static pre-
servative.

BE4331

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 BE-169
BODY ELECTRICAL - AUDIO SYSTEM

6. OUTLINE OF AVC-LAN
(a) What is AVC-LAN?
AVC-LAN is the abbreviation, which stands for Audio Visual Communication-Local Area Network.
This is a unified standard co-developed by 6 audio manufactures associated with Toyota Motor Corpo-
ration.
The Unified standard covers signals, such as audio signal, visual signal, signal for switch indication
and communication signal.

Radio Receiver Assembly Power Amplifier

I12412

(b) Objectives
Recently the car audio system has been rapidly developed and functions have been changed drasti-
cally. The conventional system has been switched to the multi-media type such as a navigation sys-
tem. At the same time the level of customers needs to audio system has been upgraded. This lies be-
hind this standardization.
The concrete objectives are explained below.
(1) When products by different manufactures were combined together, there used to be a case that
malfunction occurred such as sound did not come out. This problem has been resolved by stan-
dardization of signals.
(2) Various types of after market products have been able to add or replace freely.
(3) Because of the above (2), each manufacture has become able to concentrate on developing
products in their strongest field. This has enabled many types of products provided inexpensive-
ly.
(4) Conventionally, a new product developed by a manufacture could not be used due to a lack of
compatibility with other manufactures products. Because of this new standard, users can enjoy
compatible products provided for them timely.
The above descriptions are the objectives to introduce AVC-LAN. By this standardization, development of
new products will no longer cause systematic errors. Thus, this is very effective standard for a product in the
future.
HINT:
 When +B short or GND short is detected in AVC-LAN circuit, communication stops. Accordingly the
audio system does not function normally.
 When audio system is not equipped with a navigation system, audio head unit is the master unit. (When
audio system is equipped with a navigation system, navigation ECU is the master unit.)
 The car audio system using AVC-LAN circuit has a diagnosis function.
 Each product has its own specified numbers called physical address. Numbers are also allotted to
each function in one product, which are called logical address.

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BE-170
BODY ELECTRICAL - AUDIO SYSTEM

7. DIAGNOSIS FUNCTION
Error codes over tuner and connected equipment are displayed on the screen of tuner.
(a) Starting and Finishing Diagnosis Mode
With the audio system OFF and the ignition switch in ACC, while simultaneously pressing the preset
buttons ”1” and ”6”, push ”DISC” or ”CD” 3 times.
HINT:
 A beep sound 3 times and the system goes on to the Service Check Mode.
 System check and diagnosis memory check is performed in the Service Check Mode and the check
result is displayed in ascending order of the component codes.
 It may take about 40 sec. to complete these checks.

DISC
Button

SEEK ”UP” or
”DOWN” Switch
PRESET Switch I23259

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 BE-171
BODY ELECTRICAL - AUDIO SYSTEM

(b) Displaying Result in Service Check Mode (For checking the system condition at present and in the
past)
(1) By the ”SEEK” switch operation, confirm the check result of each component.

P: This shows the physical address

190: Physical Address
SEEK SEEK

good: Normal

SEEK SEEK
P: This shows the physical address
360: Physical Address
SEEK SEEK

CHEC: Check

This illustration shows an example that the system has components of code 190 and 360 and an error
occurs in the physical address 360.

Component codes are displayed in ascending order, and each of them is followed by its check result.

I18570

Code No. (physical address) List

Code No. (physical address) Equipment name
190 Radio receiver assembly (Audio head unit)
440 Power amplifier

(2) If ”CHEC” or ”ECHm” is detected in a component, activate the Detail Display mode and check
its DTC.
(3) To restart the Service Check, press the preset button ”1”.
(4) To exit the diagnosis mode, press ”DISC” or ”CD” for 2 sec. or more, or turn the ignition switch
OFF.

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BE-172
BODY ELECTRICAL - AUDIO SYSTEM

(c) DISPLAYING RESULTS

Results for each check are displayed as follows:
( ): Meaning
 good (Normal)
No DTC is detected for both ”System Check Confirmation” and ”Diagnosis Memory Response”.
 nCon(No connection)
Although identified by the system at the time of registration, it has transmitted no response when
the diagnosis mode is started.
 CHEC(Check)
If this is displayed, activate the Detail Display Mode and Check the DTC.
 ECHn(Exchange)
-ditto-
 OLd (Old Version)
An old version diagnosis system applies to this component.
 nrES (No Response)
In spite of response identified when the diagnosis mode is started, no diagnostic information has
been responded.
(d) Detail Display Mode (For displaying DTC of erratic components)
(1) While ”CHEC” or ECHn” is displayed, press the preset button ”2” to go on to the Detail Display
Mode.
(2) By the ”SEEK” switch operation, ”the system check result (SYS)” and ”the diagnosis memory re-
sponse result (COdE)” can be displayed.
(3) Refer to the diagnosis code list and inspect the defective part(s).
(4) Press the preset button ”3” to return to the Service Check Mode.

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 BE-173
BODY ELECTRICAL - AUDIO SYSTEM

(e) Service Check Mode

SEEK SEEK

Preset switch ”3” Preset switch ”2”

Detail Display Mode P: This shows the physical address
*
380: Physical Address
SEEK SEEK

Sys: System check result

SEEK SEEK
I: This shows the first code
Details of the first 65: Logic address
code detected as the SEEK
SEEK
system check result is
displayed. 44: DTC No.

SEEK SEEK

Continued if there is more than

one DTC.
SEEK SEEK
CODE: Diagnosis memory re-
sponse result
SEEK SEEK
I: This shows the first code
01: Logic address
SEEK SEEK

E4: DTC No.

Details of the first
code detected as SEEK SEEK
diagnosis memory re- P: This shows the physical address
sponse result is dis- 190: Auxiliary code
played.
SEEK SEEK

6F: Connection check number

SEEK SEEK

05: Number of occurrence

SEEK SEEK
Continued if there is
more than one DTC.

* to * return

This illustration shows an example that the system check and diagnosis memory response have de-
tected DTC ”44” and ”E4” in the component code 380.

In the Detail Display Mode, a system check result is displayed before the diagnosis memory response result.

If a DTC does not have any auxiliary code, no auxiliary code is displayed.
I18571
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BE-174
BODY ELECTRICAL - AUDIO SYSTEM

(f) DISPLAY IN DETAIL DISPLAY MODE

Display Order by ”SEEK UP” button operation
Segment for DTC Meaning
(Reverse order when operating ”SEEK DOWN” button)
Sys System check result Physical address → DTC
Physical address → DTC → Auxiliary code → Connection
COdE Diagnosis memory response result
check number → Number of occurrence

(g) Deleting DTC memory (Deleting DTC stored in the past)

(1) After repairing defective part(s), start the diagnosis mode.
(2) Press the preset button ”5” for 2 sec. or more. (Display: ”CLr”)
HINT:
When DTC memory is completely deleted, a beep sounds once.
(3) Pressing the preset button ”1”, perform the Service Check again and confirm that no error is dis-
played for all component codes.

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 BE-175
BODY ELECTRICAL - AUDIO SYSTEM

8. DIAGNOSTIC TROUBLE CODE CHART

Terms Meaning
Physical address Three-digit code (shown in hexadecimal) which is given to each component comprising the
AVC - LAN
Corresponding to the function, individual symbols are specified..
Logical address Two-digit code (shown in hexadecimal) which is given to each function comprising the inner system
of the AVC - LAN.

Physical address: 440 Power amplifier

DTC Diagnosis item Diagnosis content Countermeasure and

Logical address
inspected parts
01 21 ROM Error Abnormal condition of ROM is de- Replace power amplifier.
(Communication tected.
control)
01 22 RAM Error Abnormal condition of RAM is de- Replace power amplifier.
(Communication tected.
control)
01 D6 Absence of Component in which this code is re-
Check harness for power supply
(Communication Master corded has been disconnected system of radio receiver assembly.
Control) from system with ignition in ACC or
Check harness for communica-
ON. Or, when this code was re- tion system of radio receiver as-
corded, power amplifier was dis- sembly.
connected.
Check harness for power supply
system of power amplifier.

Check harness for communica-
tion system of power amplifier.
01 *6 D7 Connection Component in which this code is re-
Check harness for power supply
(Communication Check Error corded has been disconnected system of radio receiver assembly.
Control) from system after engine start.
Check harness for communica-
Or, when this code was recorded, tion system of radio receiver as-
power amplifier was disconnected. sembly.

Check harness for power supply
system of power amplifier.

Check harness for communica-
tion system of power amplifier.
01 DC Transmission Transmission to component shown If same auxiliary code is recorded in
(Communication Error by auxiliary code has been failed. other component(s), check harness
Control) (This code does not necessarily for power supply and communica-
mean actual failure.) tion system of components shown
sub code.
01 DD Master Reset After engine is started, power am-
Check harness for power supply
(Communication (Momentary plifier was disconnected from sys- system of power amplifier.
Control) Interruption) tem.
Check harness for communica-
tion system of power amplifier.

If error occurs frequently, replace
power amplifier.

01 DF Master Error Due to defective condition of com-
Check harness for power supply
(Communication ponent with a display, master func- of power amplifier.
Control) tion is switched to audio equip-
Check harness for communica-
ment . Error occurs in communica- tion system of power amplifier.
tion between sub-master (audio)
Check harness for communica-
and master component. tion system between power amplifi-
er and sub-master component.

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BE-176
BODY ELECTRICAL - AUDIO SYSTEM

01 E2 ON/OFF Error is detected in ON/OFF control Replace power amplifier.

(Communication Instruction command from power amplifier.
Control) Parameter
Error

01 E4 Plural Frame Plural frame transmission is
Since this DTC is provided for en-
(Communication Abort aborted. gineering purpose, it may be de-
Control) tected when no actual failure exists.

*6: When 210 sec. has passed after pulling out the power supply connector of the master component with the ignition
switch in ACC or ON, this code is stored.

Physical address: 190 Radio receiver assembly

Diagnosis content Countermeasure and

Logical address DTC Diagnosis item
inspected parts

01 21 ROM Error Error is detected in internal ROM. Replace radio receiver assembly.
(Communication
Control)

01 22 RAM Error Error is detected in internal RAM. Replace radio receiver assembly.
(Communication
Control)

01 *3 D8 No Response Component shown by auxiliary code
Check harness for power supply
(Communication to Connection is or had been disconnected from system of component shown by
Control) Check system after engine start. auxiliary code.

Check harness for communica-
tion system of component shown by
auxiliary code.

01 *2 D9 Last Mode Error Component operated (sounds and/ Check harness for power supply
(Communication or images were provided) before en- system of component shown by
Control) gine stop is or has been discon- auxiliary code.
nected with ignition switch in ACC or Check harness for communication
ON. system of component shown by
auxiliary code.
01 DA No Response No response is identified when
Check harness for power supply
(Communication to ON/OFF changing mode (audio and visual of component shown by auxiliary
Control) Instruction mode change). Detected when code.
sound and picture does not change
Check harness for communica-
by button operation. tion system of component shown by
auxiliary code.

If error occurs again, replace
component shown by auxiliary
code.
01 *2 DB Mode Status Dual alarm is detected.
Check harness for power supply
(Communication Error of component shown by auxiliary
Control) code.

Check harness for communica-
tion system of component shown by
auxiliary code.
01 *4 DC Transmission Transmission to component shown
If same auxiliary code is recorded
(Communication Error by auxiliary code has been failed. in other component, check harness
Control) (Detecting this DTC does not nec- for power supply and communica-
essary mean actual failure.) tion system of components shown
sub code.

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 BE-177
BODY ELECTRICAL - AUDIO SYSTEM

01 *5 DD Master Reset After engine is started, multi-dis-
If this error occurs frequently, re-
(Communication (Momentary play assembly was disconnected place multi-display assembly.
Control) Interruption) from system.
01 *5 DE Slave Reset After engine is started, slave com-
Check harness for power supply
(Communication (Momentary ponent was disconnected from sys- of component shown by auxiliary
Control) Interruption) tem. code.

Check harness for communica-
tion system of component shown by
auxiliary code.
01 *6 DF Master Error Due to defective condition of radio
Check harness for power supply
(Communication receiver assembly, master function of multi-display assembly.
Control) is switched to audio equipment.
Check harness for communica-
Error occurs in communication be- tion system of radio receiver as-
tween sub-master (audio) and ra- sembly.
dio receiver assembly.
Check harness for communica-
tion system between radio receiver
assembly and sub-master compo-
nent.
01 *2 E1 Audio While source equipment is operat-
Check harness for power supply
(Communication processor ON ing, AMP output is stopped. of multi-display assembly.
Control) error
Check harness for communica-
tion system of radio receiver as-
sembly.
01 E2 ON/OFF Error occurs in ON/OFF controlling
Replace radio receiver assembly.
(Communication Instruction command from radio receiver as-
Control) Parameter sembly.
Error
01 E4 Plural Frame Plural frame transmission is
Since this DTC is provided for en-
(Communication Abort aborted. gineering purpose, it may be de-
Control) tected when no actual failure exists.
60 43 AM Tuner Error Abnormal condition is detected in Replace radio receiver assembly.
(Radio receiver AM tuner.
assembly) Inspect radio receiver assembly.
60 44 FM Tuner Error Abnormal condition is detected in Replace radio receiver assembly.
(Radio receiver FM tuner.
assembly)
61 40 Mechanical or Malfunction due to mechanical fail- Inspect cassette tape.
(Cassette Media Error ure is identified. Or, cassette tape is
switch) cut or entangled.
63 47 CD High Temp High temperature is detected in CD Replace radio receiver assembly.
(In-dash CD changer.
changer)
63 48 CD Excess Excess current is applied to CD Replace radio receiver assembly.
(In-dash CD Current changer.
changer)

*2: Even if no failure is detected, it may be stored depending on the battery condition or voltage for starting an engine.
*3: It is stored when 180 sec. has passed after the power supply connector is pulled out after engine start.
*4: It may be stored when the engine key is turned again 1 min. after engine start.
*5: It may be stored when the engine key is turned again after engine start.
*6: When 210 sec. has passed after pulling out the power supply connector of the master component with the ignition
switch in ACC or ON, this code is stored.

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BE-178
BODY ELECTRICAL - AUDIO SYSTEM
BE1X5-03

TROUBLESHOOTING
NOTICE:
When replacing the internal mechanism (computer part) of the audio system, be careful that no part
of your body or clothing comes in contact with the terminals of the leads from the IC, etc. of the re-
placement part (spare part).
HINT:
This inspection procedure is a simple troubleshooting which should be carried out on the vehicle during sys-
tem operation and was prepared on the assumption of system component troubles (except for the wires and
connectors, etc.).
Always inspect the trouble taking the following items into consideration.

Open or short circuit of the wire harness

Connector or terminal connection fault
Problem No.
Radio Radio not operating when power switch turned to ’ON’. 1
Display indicates when power switch turned to ’ON’, but no sound (including
2
’noise’) is produced.
Noise present, but AM - FM not operating. 3
Any speaker does not work. 4
Any AM or FM does not work. 5
Few preset turning bands. 5
Reception poor. 6
Sound quality poor. 7
Preset memory disappears. 8
Tape Player Cassette tape cannot be inserted. 9
Cassette tape inserted, but no power. 10
Power coming in, but tape player not operating. 11
Any speaker does not work. 12
Sound quality poor. 13
Tape jammed, malfunction with tape speed or auto-reverse. 14
Cassette tape will not eject. 15
CD Player CD cannot be inserted. 16
CD inserted, but no power. 17
Power coming in, but CD player not operating. 18
Sound jumps. 19
Sound quality poor (Volume faint). 20
Any speaker does not work. 21
CD will not be ejected. 22
Power Amplifier No power coming in. 23
Power coming in, but power amplifier not operating. 24
Any speaker does not work. 25
Noise Noise occurs 26
Noise produced by vibration or shock while driving. 27
Noise produced when engine starts. 28
The term ”AM” includes LW, MW and SW, and the term ”FW” includes UKW.

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 BE-179
BODY ELECTRICAL - AUDIO SYSTEM

1 Radio RADIO NOT OPERATING WHEN POWER SWITCH TURNED TO ”ON”

Is tape player operating normally? Radio assembly faulty.

Yes
No

Check if RAD-No.2 fuse is OK? Replace fuse.

NG
OK

Is power supplied to ACC terminal of radio assembly? ACC wire harness faulty.
No
Yes

Check if RAD-No.1 fuse is OK? Replace fuse.

OK NG

Is power supplied to +B terminal of radio assembly? + B wire harness faulty.

No
Yes

Check if GND (wire harness side) to radio assembly is OK? GND faulty.
NG
OK

Radio assembly faulty.

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BE-180
BODY ELECTRICAL - AUDIO SYSTEM

DISPLAY INDICATES WHEN POWER SWITCH TURNED TO

2 Radio
”ON”, BUT NO SOUND (INCLUDING ”NOISE”) IS PRODUCED

Is tape player operating normally? Radio assembly faulty.

No Yes

Check if RAD-No.2 fuse is OK? Replace fuse.

OK NG

Is power supplied to ACC terminal of power amplifier? ACC wire harness faulty.
No
Yes

Check if RAD-No.1 fuse is OK? Replace fuse.

NG
OK

Is power supplied to +B terminal of power amplifier? + B wire harness faulty.

Yes No

Check if GND (wire harness side) of power amplifier GND faulty.

grounded normally?
NG
OK

Is power supplied to ACC terminal of radio receiver? ACC wire harness faulty.
Yes No

Is power supplied to +B terminal of radio receiver? +B wire harness faulty.

Yes No

Check if GND (wire harness side) of radio assembly GND faulty.

grounded normally? NG
OK

Does continuity exist in speaker wire harness? Speaker wire harness faulty.
No
Yes

Temporarily install another speaker. Functions OK? Speaker faulty.

Yes
No

Hiss noise from speaker? Power amplifier faulty.

No Recheck system after repair.
Yes

Radio assembly faulty. Recheck system after repair.

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 BE-181
BODY ELECTRICAL - AUDIO SYSTEM

3 Radio NOISE PRESENT, BUT AM-FM NOT OPERATING

Go to No.25

If radio side faulty.

Radio faulty.

4 Radio ANY SPEAKER DOSE NOT WORK

Is tape player operating normally? Radio assembly faulty.

Yes
No

Is hiss noise produced by non-functioning speaker? Radio assembly faulty.

Yes Recheck system after repair.
No

Does continuity exist in speaker wire harness? Speaker wire harness faulty.
No
Yes

Temporarily install another speaker? Functions OK? Speaker faulty.

Yes
No

Power amplifier faulty. Recheck system after repair.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2185

BE-182
BODY ELECTRICAL - AUDIO SYSTEM

ANY AM OR FM DOES NOR WORK

5 Radio FEW PRESET TUNING BANDS

Problem with radio wave signals or location? Poor signals, poor location.
Yes
No

Is power for the antenna being output from the radio assembly? Radio assembly faulty.
No Yes

Are both AM and FM defective?

No
Yes

Go to No.16

Is tape player operating normally? Radio assembly faulty.

No Yes

Temporarily install another speaker. Functions OK? Speaker faulty.

Yes
No

Hiss noise from speaker? Power amplifier faulty.

No Recheck system after repair.
Yes

Radio assembly faulty. Recheck system after repair.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2186

 BE-183
BODY ELECTRICAL - AUDIO SYSTEM

6 Radio POOR RECEPTION

Is the condition bad in comparison with other vehicles? An electric wave environment is bad.
Yes
No

Are there any additional installation parts? Does the condition get better if
(Sun shade film, telephone antenna, etc.) Yes removing them?
No Yes

Influence of additional installation parts.

Check if there is any scratch and breaking of a wire on Repair. (See page BE-102 )
the glass antenna and the defogger pattern. Yes
(visual check. tester)
(See page BE-167 )

No

Is the contact of the plug jack of the radio OK? Take a measure for contact.
No
Yes

Does the condition get better by using the outer Check the radio.
antenna (such as pillar antenna)? No

Yes

Is the contact of the antenna terminal on the glass Take a measure for contact.
surface and the defogger terminal? No
Yes

Is the continuity of the antenna cord OK? Replace the antenna cord.
Yes No

Check the grounding of the antenna, antenna cord, Grounding failure.

choke coil, and noise filter. (See page BE-167 ) NG

OK

Does the condition get better by replacing Replace the choke coil.
the choke coil? Yes

No

Does the condition get better by replacing the Replace the antenna cord.
antenna cord? Yes

No

Exchange the glass.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2187

BE-184
BODY ELECTRICAL - AUDIO SYSTEM

7 Radio SOUND QUALITY POOR

Is sound quality always bad? Is sound quality bad in certain Poor signals, poor location.
No Yes
areas only?
Yes
No

Is tape player operating normally?

No Yes

Radio assembly or power Radio assembly faulty.

amplifier faulty.

Is tape player operating normally? Radio assembly faulty.

No Yes

Is speaker properly installed? Install properly.

Yes No

Temporarily install another speaker. Functions OK? Speaker faulty.

Yes
No
Radio assembly or power amplifier faulty.
Recheck system after repair.

8 Radio PRESET MEMORY DISAPPEARS

Can cassette tape be inserted in tape player? Radio assembly faulty.

No Yes

Check if RADIO No.1 fuse is OK? Replace fuse.

OK NG

Is power supplied to +B terminal of radio assembly? +B wire harness faulty.

No
Yes

Check if GND (wire harness side) of radio assembly GND

NG
grounded normally?

OK

Radio assembly faulty.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2188

 BE-185
BODY ELECTRICAL - AUDIO SYSTEM

9 Tape Player CASSETTE TAPE CANNOT BE INSERTED

Is there a foreign object inside tape player? Remove foreign object.

Yes
No

Is auto search button radio operating normally? Radio assembly faulty.

Yes
No

Check if RADIO No.1 fuse is OK? Replace fuse.

OK NG

Is power supplied to +B terminal of radio assembly? +B wire harness faulty.

No
Yes

Check if GND (wire harness side) of radio assembly GND faulty.

grounded normally?
NG
OK

Radio assembly faulty.

10 Tape Player CASSETTE TAPE INSERTED, BUT NO POWER

Is radio operating normal? Radio assembly faulty.

No Yes

Check if RAD No.2 fuse is OK? Replace fuse.

OK NG

Is power supplied to ACC terminal of radio assembly? ACC wire harness faulty.
No
Yes
Check if RADIO No.1 fuse is OK? Replace fuse.
NG
OK

Is power supplied to +B terminal of radio assembly? +B wire harness faulty.

Yes No

Radio assembly faulty.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2189

BE-186
BODY ELECTRICAL - AUDIO SYSTEM

11 Tape Player POWER COMING IN, BUT TAPE PLAYER NOT OPERATING

Function OK if different cassette tape inserted? Cassette tape faulty.

Yes
No

Is radio operating normally? Radio assembly faulty.

Yes
No

Does continuity exist in speaker wire harness? Speaker wire harness faulty.
No
Yes

Temporarily install another speaker. Speaker faulty.

Function OK? Yes
No

Hiss noise from speaker? Power amplifier faulty.

No
Recheck system after repair.
Yes

Radio assembly faulty.

Recheck system after repair.

12 Tape Player ANY SPEAKER DOES NOT WORK

Is radio operating normally? Radio assembly faulty.

Yes
No

Is hiss noise produced by non-functioning speaker. Radio assembly faulty.

Yes Recheck system after repair.
No

Does continuity exist in speaker wire harness? Speaker wire harness faulty.
Yes No

Temporarily install another speaker. Speaker faulty.

Function OK? Yes

No

Radio assembly or power amplifier faulty.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2190

 BE-187
BODY ELECTRICAL - AUDIO SYSTEM

13 Tape Player SOUND QUALITY POOR (VOLUME FAINT)

Function OK if different cassette tape inserted? Cassette tape faulty.

Yes
No

Operates normally after cleaning the heads? Head dirty.

Yes
No

Is radio operating normally? Radio assembly faulty.

Yes
No

Is speaker properly installed? Install properly.

No
Yes

Temporarily install another speaker. Speaker faulty.

Function OK? Yes
No

Radio assembly faulty.

14 Tape Player TAPE JAMMED MALFUNCTION WITH TAPE SPEED OR AUTO-REVERSE

Function OK if different tape (less than 120 mins.) is inserted? Cassette tape faulty.
Yes
No

Is there a foreign object inside tape player? Remove foreign object.

Yes
No

Operates normally after cleaning the heads? Head dirty.

Yes
No

Radio assembly faulty.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2191

BE-188
BODY ELECTRICAL - AUDIO SYSTEM

15 Tape Player CASSETTE TAPE WILL NOT BE EJECTED

Is tape player operating normally? Cassette tape jammed.

Yes No

Is auto search button of radio operating normally? Radio assembly faulty.

Yes
No

Check if RADIO No.1 fuse is OK? Replace fuse.

NG
OK

Is power supplied to +B terminal of radio assembly? +B wire harness faulty.

No
Yes

Radio assembly faulty.

16 CD Player CD CANNOT BE INSERTED

Six discs have been already inserted? Eject CD.

No Yes

Is auto search button of radio operating normally? Radio assembly faulty.

Yes
No

Check if RADIO No.1 fuse is OK? Replace fuse.

NG
OK

Is power supplied to +B terminal of radio assembly? +B wire harness faulty.

No
Yes

Check if GND (wire harness side) of radio assembly GND faulty.

grounded normally? NG

OK

Radio assembly faulty.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2192

 BE-189
BODY ELECTRICAL - AUDIO SYSTEM

17 CD Player CD INSERTED, BUT NO POWER

Yes
Is radio operating normally? Radio assembly faulty.

No

Check if RADIO No.2 fuse is OK? Replace fuse.

OK NG

Is power supplied to ACC terminal of radio assembly? ACC wire harness faulty.
No
Yes

Radio assembly faulty.

18 CD Player POWER COMING IN, BUT CD PLAYER NOT OPERATING

Is CD inserted with correct side up? Insert correctly.

No
Yes

Function OK if different CD inserted? CD faulty.

Yes
No

Is radio operating normally? Radio assembly.

Yes
No

Dose continuity exist in speaker wire harness? Speaker wire harness faulty.
No
Yes

Temporarily install another speaker. Speaker faulty.

Functions OK? Yes

No

Hiss noise from speaker? No Power amplifier faulty.

Recheck system after repair.
Yes

Radio assembly faulty.

Recheck system after repair.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2193

BE-190
BODY ELECTRICAL - AUDIO SYSTEM

19 CD Player SOUND JUMPS

Does sound jump only during strong vibration? Jumping caused by vibration.
No Yes

Is radio assembly properly installed? Install properly.

Yes No

Functions OK if different CD inserted? CD faulty.

Yes
No

Radio assembly faulty.

20 CD Player SOUND QUALITY POOR (VOLUME FAINT)

Function OK if different CD inserted? CD faulty.

Yes
No

Is radio operating normally? Radio assembly faulty.

Yes
No

Is speaker property installed? Install properly.

Yes No

Temporarily install another speaker. Speaker faulty.

Functions OK? Yes
No

Radio assembly or power amplifier faulty.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2194

 BE-191
BODY ELECTRICAL - AUDIO SYSTEM

21 CD Player ANY SPEAKER DOES NOT WORK

Is radio operating normally? Radio assembly faulty.

Yes
No

Is hiss noise produced by non-functioning speaker? Radio assembly faulty.

No Yes Recheck system after repair.

Does continuity exist in speaker wire harness? Speaker wire harness faulty.
No
Yes

Temporarily install another speaker. Speaker faulty.

Function OK? Yes

No

Power amplifier faulty.

Recheck system after repair.

22 CD Player CD WILL NOT BE EJECTED

Is auto search button of radio Radio assembly faulty.

operating normally? Yes

No

Check if RADIO No.1 fuse is OK? Replace fuse.

OK NG

Is power supplied to +B terminal of radio assembly? +B wire harness faulty.

No
Yes

Radio assembly faulty.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2195

BE-192
BODY ELECTRICAL - AUDIO SYSTEM

23 Power Amplifier NO POWER COMING IN

Is tape player operating normally? Radio assembly faulty.

Yes
No

Check if RAD-No.2 fuse is OK? Replace fuse.

NG
OK

Is power supplied to ACC terminal of power amplifier? ACC wire harness faulty.
No
Yes

Check if RAD-No.1 fuse is OK? Replace fuse.

OK NG

Is power supplied to +B terminal of power amplifier? + B wire harness faulty.

No
Yes

Check if GND (wire harness side) of power amplifier GND faulty.

grounded normally? NG

OK

Is power supplied to ACC terminal of radio assembly? ACC wire harness faulty.
No
Yes

Is power supplied to +B terminal of radio assembly? +B wire harness faulty.

Yes No

Check if GND (wire harness side) of radio assembly GND faulty.

grounded normally? NG
OK

Radio assembly faulty.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2196

 BE-193
BODY ELECTRICAL - AUDIO SYSTEM

POWER COMING IN, BUT WOOFER (POWER) AMPLIFIER NOT

24 Power Amplifier
OPERATING

Is tape player operating normally? Radio assembly faulty.

No Yes

Check if RAD-No.2 fuse is OK? Replace fuse.

OK NG

Is power supplied to ACC terminal of power amplifier? ACC wire harness faulty.
No
Yes

Check if RAD-No.1 fuse is OK? Replace fuse.

NG
OK

Is power supplied to +B terminal of power amplifier? + B wire harness faulty.

Yes No

Check if GND (wire harness side) of power amplifier GND faulty.

grounded normally? NG

OK

Is power supplied to ACC terminal of radio assembly? ACC wire harness faulty.
Yes No

Is power supplied to +B terminal of radio assembly? +B wire harness faulty.

Yes No

Check if GND (wire harness side) of radio assembly GND faulty.

grounded normally? NG
OK

Is there continuity in speaker wire harness? Speaker wire harness faulty.

No
Yes

Temporarily install another speaker. Functions OK? Speaker faulty.

Yes
No

Hiss noise from speaker? Power amplifier faulty.

No Recheck system after repair.
Yes

Radio assembly faulty. Recheck system after repair.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2197

BE-194
BODY ELECTRICAL - AUDIO SYSTEM

25 Power Amplifier ANY SPEAKER DOES NOT WORK

Is radio operating normally? Radio assembly faulty.

Yes
No

Is hiss noise produced by non-functioning speaker? Radio assembly faulty.

No Yes Recheck system after repair.

Does continuity exist in speaker wire harness? Speaker wire harness faulty.
No
Yes

Temporarily install another speaker. Speaker faulty.

Function OK? Yes

No

Power amplifier faulty.

Recheck system after repair.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2198

 BE-195
BODY ELECTRICAL - AUDIO SYSTEM

26 Noise NOISE OCCURS

(It occurs in the cassette and CD.)

Does the noise occur only in the radio? Refer to No.27.
No
Yes
Does the noise occur in a particular place? An electric environment.
No Yes

Is there any additional installation part Does the noise stop by removing it?
around the glass imprinted antenna? Yes
(Sun shade film, telephone antenna etc.)

No Influence of the film or the noise radiation

of the additional installation part.

Does the noise occur even pulling out the Check the radio.
antenna cord from the radio? Yes

No

Does the noise occur even after pulling out the Noise mixing into the antenna cable.
antenna terminal on the glass surface and pole Yes
antenna?
No

Failure of glass installation.

Isn’t there any adhesive (Butyl rubber) Yes Must plane the butyl rubber.
stuck on the bases of the antenna terminal?

No

Does the noise occur even after pulling out Interfering noise from the defogger line
the defogger terminal? Yes and choke coil.

No

Grounding failure.
Check the grounding of the antenna,
NG
antenna cord.

OK

Does the condition get better by replacing Replace the Pole antenna.
the Pole antenna? Yes

No

Does the condition get better by replacing Replace the antenna cord.
the antenna cord. Yes

No

Noise radiates directly to the antenna from the

generation source.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2199

BE-196
BODY ELECTRICAL - AUDIO SYSTEM

27 Noise NOISE PRODUCED BY VIBRATION OR SHOCK WHILE DRIVING

Is speaker properly installed? Install properly.

Yes No

With vehicles stationary lightly tap each system.

Is noise produced? Yes Each system faulty.

No

Noise is produced from static electricity accumulating in the vehicle body.

28 Noise NOISE PRODUCED WHEN ENGINE STARTS

Whistling noise which becomes high-pitched when Generator noise.

accelerator strongly depressed, disappears shortly Yes
after engine stops.

No
Whining noise occurs when A/C is operating. A/C noise.
Yes
No

Scratching noise occurs during sudden acceleration, driving on rough Fuel gauge noise.
roads or when ignition switch is turned ON. Yes
No

Clicking sound is heard when horn button is pressed, then Horn noise.
released. Whirring/grating sound is heard when pushed Yes
continuously.
No

Murmuring sound stops when engine stops. Ignition noise.

Yes
No

Tick-tack noise occurs in co-ordination with blinking Turn signal noise.

of flasher. Yes
No

Noise occurs during window washer operation. Washer noise.

No Yes

Scratching noise occurs while engine is running, Engine coolant temp. gauge noise.
and continues a while even after engine stops. Yes
No

Scraping noise in line with wiper beat. Wiper noise.

Yes
No

Other type of noise

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2200

 BE-197
BODY ELECTRICAL - AUDIO SYSTEM
BE2A9-02

LOCATION

Tweeter

Power Amplifier

Radio Assembly

Driver Side Junction Block

RADIO No. 2 Fuse
Rear Speakers
Sedan:

Front Speakers

I27832

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2201

BE-198
BODY ELECTRICAL - AUDIO SYSTEM

wagon:
Squawker Squawker
Rear Speaker

Box Woofer

Front Speaker

I27833

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2202

 BE-199
BODY ELECTRICAL - AUDIO SYSTEM
BE16M-07

INSPECTION
1. INSPECT POWER AMPLIFIER CIRCUIT
Connect the connector from power amplifier and inspect the
connector on the wire harness side.

Power amplifier side

Connector ”A” Connector ”B”

e 16 2 A I11410

Tester connection Condition Specified condition

A1 - Ground
Audio sounding 5-7V
(FL+)

A2 - Ground
Audio sounding 5-7V
(FR+)

A3 - Ground
Audio sounding 5-7V
(RL+)
A4 - Ground
Audio sounding 5-7V
(WL+)

A5 - Ground
Audio sounding 5-7V
(RR+)

A6 - Ground
Audio sounding 5-7V
(WR+)

A7 - Ground
Audio sounding Battery voltage
(BU+)
A8 - Ground
Audio sounding 5-7V
(FL-)

A9 - Ground
Audio sounding 5-7V
(FR-)

A10 - Ground
Audio sounding 5-7V
(RL-)

A11 - Ground
Audio sounding 5-7V
(WL-)
A12 - Ground
Constant Continuity
(GND)

A14 - Ground
Audio sounding 5-7V
(RR-)

A15 - Ground
Audio sounding 5-7V
(WR-)

A16 - Ground
Ignition switch ACC Battery voltage
(ACC)
B1 - Ground
Constant Battery voltage
(TX+)

B2 - Ground
Radio power switch ON Battery voltage
(CTX+)
2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2203

BE-200
BODY ELECTRICAL - AUDIO SYSTEM

B5 - Ground
Audio sounding Battery voltage
(N-MUTE)

B6 - Ground
Audio sounding Battery voltage
(T-MUTE)
B7 - Ground
Audio sounding 1 V or below
(MUTE)

B8 - Ground
Audio sounding 1 V or below
(L+)

B9 - Ground
Audio sounding 1 V or below
(R+)

B10 - Ground
Constant Continuity
(TX-)
B11 - Ground
Constant Continuity
(CTX-)

B14 - Ground
Constant Continuity
(GND)

B15 - Ground
Constant Continuity
(GND)

B17 - Ground
Audio sounding 1 V or below
(L-)
B18 - Ground
Audio sounding 1 V or below
(R-)

If the circuit is not as specified, inspect the circuits connected

to other parts.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2204

 BE-201
BODY ELECTRICAL - AUDIO SYSTEM

2. INSPECT RADIO RECEIVER ASSEMBLY CIRCUIT

Connect the connectors from the radio receiver assembly, and
inspect the connector on the wire harness side.

Radio Receiver Side

Connector ”A” Connector ”B”

I15534

Tester connection Condition Specified condition

A1 - Ground
Constant Battery Positive Voltage
(B)

A2 - Ground
Light switch ON Battery Positive Voltage
(ILL+)

A3 - Ground
Ignition switch ACC 10 - 14 V
(AMP)

A7 - Ground
Ignition switch ACC and Audio OFF 1 V or below
(MUTE)
A8 - Ground
Audio sounding Approx. 0.7 V
(CDR+)

A9 - Ground
Audio sounding Approx. 0.7 V
(CDL+)

A11 - Ground
Ignition switch ACC Battery Positive Voltage
(ACC)

A12 - Ground
Light switch ON 0 - 14 V (Variable)
(ILL-)
A13 - Ground
Radio power switch ON Battery Positive Voltage
(ANT)

A16 - Ground
Constant Continuity
(SGND)

A18 - Ground
Audio sounding Approx. 0.7 V
(CDR-)

A19 - Ground
Audio sounding Approx. 0.7 V
(CDL-)
A20 - Ground
Constant Continuity
(E)

B9 - Ground
System check mode -
(TX-)

B10 - Ground
System check mode -
(TX+)

*: w/ LEXUS navigation system

If the circuit is not as specified, inspect the circuits connected
to other parts.

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2205

BE-202
BODY ELECTRICAL - AUDIO SYSTEM

HINT:
Check the wire harness between radio receiver assembly and
power amplifier.
3. INSPECT GLASS IMPRINTED ANTENNA
Use same procedure as for ”INSPECT DEFOGGER WIRES”
on page BE-102 .
4. REPAIR GLASS IMPRINTED ANTENNA
Use same procedure as for ”REPAIR DEFOGGER WIRES” on
page BE-102 .

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2206

 BE-203
BODY ELECTRICAL - ANTENNA

ANTENNA
BE16N-04

LOCATION

Sedan:
Pole Antenna

Glass Printed Antenna

Radio Assembly

Pole Antenna

Wagon:

Radio Assembly
Glass Printed Antenna

I27834

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2207

BE-204
BODY ELECTRICAL - ANTENNA
BE2AA-01

COMPONENTS
Instrument Panel Assembly

Combination Meter

Instrument Cluster w/ LEXUS navigation system:

Finish Panel
Cover

Steering Column
Upper Cover
Horn
Combination
Switch Assembly

Center Cluster
Finish Panel

Steering Wheel
Radio Assembly
Steering Column
Lower Cover

Cowl Side Trim Board RH

Lower Center Cluster
Finish Panel
Front Door Inner
Scuff Plate RH Console Panel Upper
Hood Lock
Release Cable Glove
Compartment
Door Assembly
DLC3

Instrument Panel
Finish Panel

w/ Armrest:
Armrest

Cowl Side
Trim Board LH
Parking Brake Hole Cover
Console Box
Front Door Inner Scuff Plate LH

I23229

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2208

 BE-205
BODY ELECTRICAL - ANTENNA

Sedan:
Visor Holder Roof Headlining Assy
Visor Assy RH
Assist Grip
Visor Assy LH

Inner Rear View

Mirror
Sliding Roof Opening
Trim Moulding
Inner Rear View
Mirror Cover Assist Grip
w/ Sliding Roof
Map Light Assy Map Light Assy
Assist Grip
Room Light Assy
Room Light Lens Front Door Opening
Front Pillar Garnish Trim Weatherstrip RH
RH
Defroster Lower Center Pillar Garnish Map Light Lens
Nozzle Assembly RH and Cover
Seat Belt Anchor Cover Cap
Antenna Pole
Antenna
Protector
Antenna
Cord Roof Side
Inner Garnish
Front Pillar Garnish RH
LH Center Pillar
Garnish LH
Front Door Inner Scuff Rear Door Opening
Plate RH Trim Weatherstrip RH
Seat Belt Anchor
Cover Cap
Rear Door Inner
Center Pillar Garnish Scuff Plate RH
LWR RH

Roof Side Inner Gar-

nish LH
Bench Type Rear Seat
Cushion Assembly

Front Door Inner

Scuff Plate LH
Front Door Opening
Trim Weatherstrip LH Rear Door Opening
Trim Weatherstrip LH
Center Pillar Garnish
LWR LH
Rear Door Inner
Scuff Plate LH Bench Type Rear Seat
Back Assembly
I23230

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2209

BE-206
BODY ELECTRICAL - ANTENNA

Wagon:
Visor Holder Roof Headlining Assy
Visor Assy RH
Assist Grip
Visor Assy LH

Inner Rear View

Mirror Sliding Roof Opening
Trim Moulding

Inner Rear View

Mirror Cover Assist Grip w/ Sliding Roof
Map Light Assy
Map Light Assy Assist Grip
Room Light Assy
Front Door Opening
Room Light Lens Trim Weatherstrip RH
Front Pillar Garnish Rear Center
RH Seat Belt Bezel
Defroster Lower Center Pillar Garnish Map Light Lens
Nozzle Assembly RH and Cover
Seat Belt Anchor Cover Cap
Antenna Pole
Antenna
Antenna Protector
Cord
Roof Side
Inner Garnish
Front Pillar Garnish RH
LH
Center Pillar
Garnish LH Front Door Inner
Scuff Plate RH
Rear Door Opening
Seat Belt Anchor Trim Weatherstrip RH
Cover Cap
Center Pillar Garnish Rear Door Inner
LWR RH Scuff Plate RH

Roof Side Inner Gar-

nish LH
Bench Type Rear Seat
Cushion Assembly

Front Door Inner

Scuff Plate LH
Front Door Opening
Trim Weatherstrip LH

Center Pillar Garnish

LWR LH
Rear Door Opening Rear Seat
Rear Door Inner Scuff Back Side RH
Plate LH Trim Weatherstrip Rear Seat
LH Back Side LH
I23231

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2210

 BE-207
BODY ELECTRICAL - ANTENNA
BE16P-02

REMOVAL
HINT:
Installation is in the reverse order of removal.
1. REMOVE INSTRUMENT CLUSTER FINISH PANEL
CENTER
2. REMOVE INSTRUMENT CLUSTER FINISH PANEL
CENTER LOWER
3. REMOVE AIR CONDITIONER ASSEMBLY
4. REMOVE CONSOLE PANEL UPPER
5. REMOVE PARKING BRAKE HOLE COVER
6. REMOVE CONSOLE BOX
7. REMOVE GLOVE COMPARTMENT DOOR ASSEMBLY
8. REMOVE HORN BUTTON
9. REMOVE STEERING WHEEL
10. REMOVE STEERING COLUMN LOWER COVER
11. REMOVE STEERING COLUMN UPPER COVER
12. REMOVE TURN SIGNAL SWITCH ASSEMBLY
13. REMOVE INSTRUMENT PANEL FINISH PANEL LOW-
ER
14. REMOVE INSTRUMENT CLUSTER FINISH PANEL
15. REMOVE COMBINATION METER
16. REMOVE FRONT DOOR INNER SCUFF PLATE RH
17. REMOVE FRONT DOOR INNER SCUFF PLATE LH
18. REMOVE COWL SIDE TRIM BOARD RH
19. REMOVE COWL SIDE TRIM BOARD LH
20. REMOVE FRONT DOOR OPENING TRIM WEATH-
ERSTRIP RH
21. REMOVE FRONT DOOR OPENING TRIM WEATH-
ERSTRIP LH
22. REMOVE FRONT PILLAR GARNISH RH
23. REMOVE FRONT PILLAR GARNISH LH
24. DISCONNECT PASSENGER AIRBAG CONNECTOR
25. REMOVE INSTRUMENT PANEL ASSEMBLY

26. REMOVE INSTRUMENT PANEL REINFORCEMENT

BRACKET
Remove the bolt and nut and pull instrument panel reinforce-
ment.

I11415

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2211

BE-208
BODY ELECTRICAL - ANTENNA

27. REMOVE A PART OF INSTRUMENT PANEL WIRE

Remove the 2 clips and a part of instrument panel wire.
28. REMOVE DEFROSTER LOWER NOZZLE
29. REMOVE BENCH TYPE REAR SEAT CUSHION AS-
SEMBLY
30. REMOVE BENCH TYPE REAR SEAT BACK AS-
SEMBLY
31. REMOVE REAR DOOR INNER SCUFF PLATE RH
I11416 32. REMOVE REAR DOOR INNER SCUFF PLATE LH
33. REMOVE REAR DOOR OPENING TRIM WEATHER
STRIP RH
34. REMOVE REAR DOOR OPENING TRIM WEATHER
STRIP LH
35. REMOVE CENTER PILLAR GARNISH LOWER RH
36. REMOVE CENTER PILLAR GARNISH LOWER LH
37. REMOVE SEAT BELT ANCHOR COVER CAP
38. REMOVE FRONT SEAT OUTER BELT ASSEMBLY RH
39. REMOVE FRONT SEAT OUTER BELT ASSEMBLY LH
40. REMOVE CENTER PILLAR GARNISH RH
41. REMOVE CENTER PILLAR GARNISH LH
42. REMOVE ROOF SIDE INNER GARNISH RH
43. REMOVE ROOF SIDE INNER GARNISH LH
44. REMOVE ASSIST GRIP COVER
45. REMOVE ASSIST GRIP
46. REMOVE VISOR ASSEMBLY RH
47. REMOVE VISOR ASSEMBLY LH
48. REMOVE INNER REAR VIEW MIRROR STAY HOLDER
COVER
49. REMOVE INNER REAR VIEW MIRROR
50. REMOVE MAP LIGHT ASSEMBLY
51. REMOVE ROOM LIGHT ASSEMBLY
52. w/ Sliding Roof:
REMOVE SLIDING ROOF OPENING TRIM MOULDING
53. REMOVE VISOR HOLDER
54. REMOVE ROOF HEADLINING ASSEMBLY
55. REMOVE ANTENNA ASSEMBLY
(a) Remove the 2 nuts and disconnect the connector.
(b) Remove the antenna assembly.
56. REMOVE ANTENNA COED
Remove the clamp and the antenna cord.
57. REMOVE ANTENNA POLE
Turn the antenna pole counterclockwise to remove.

I11561

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 BE-209
BODY ELECTRICAL - CLOCK

CLOCK
BE0G0-13

TROUBLESHOOTING
HINT:
Troubleshoot the clock according to the table below.
Troubleshooting No.
Passenger seat belt warning light does not light up. 1
Clock will not operate 1
Clock loses or gains time 2
± 1.5 seconds / day

1. INSPECT CLOCK CIRCUIT (See page DI-1009 )

2. TROUBLESHOOTING NO. 1

PASSENGER SEAT BELT WARNING LIGHT DOES NOT OPERATE

1
CLOCK WILL NOT OPERATE

(a) Check that the battery positive voltage is 10 - 16 V.

If voltage is not as specified, replace the battery.
(b) Check that the MPX-B and RAD No. 2 fuses are not blown.
If the fuse is blown, replace the fuse and check for short.
(c) Troubleshoot the clock as follows.
HINT:
Inspect the connector on the wire harness side.

Wire Harness Side Connector ”B” Connector ”A”

Clock Assembly (in A/C control assembly)
B7 RAD No. 2
ACC
Fuse
B8
+B MPX-B Fuse

B5 Passenger Wire Harness Side

PS/B Seat Occupant Connector ”B”
Detection Connector ”A”
Sensor
1 2 3 4 5 6 7 8
B18
GND Ground 9 10 11 1213 14 1516 17 1819 20

I11820

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BE-210
BODY ELECTRICAL - CLOCK

Is there battery positive voltage between terminal +B and No +B wire harness faulty.
body ground?

Yes

Is there battery positive voltage between terminal ACC and No

+B wire harness faulty.
body ground?

Yes

Is there battery positive voltage between terminal GND and No

Ground wire harness faulty.
body ground?

Yes

Replace clock.

3. TROUBLESHOOTING NO. 2

2 CLOCK LOSES OR GAINS TIME

(a) Check that the battery positive voltage is 10 - 16 V.

If voltage is not as specified, replace the battery.
(b) Inspect the error of the clock.
Allowable error (per day): ± 1.5 seconds
If the error exceeds the allowable error, replace the clock.
(c) Check that the clock adjusting button is sticking in position and has failed to return.
If the error exceeds the allowable error, replace the clock.
(d) Troubleshoot the clock as follows.
HINT:
Inspect the connector on the wire harness side.

Wire Harness Side Connector ”B” Connector ”A”

Clock Assembly
B7 RAD No. 2
ACC
Fuse
B8
+B MPX-B Fuse
Passenger
PS/B B5 Seat Occupant Connector ”B” Wire Harness Side
Detection Connector ”A”
Sensor

1 2 3 4 5 6 7 8
B18
GND Ground 9 10 11 1213 14 1516 17 1819 20

I11820

2005 LEXUS IS300 (RM1140U)

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 BE-21 1
BODY ELECTRICAL - CLOCK

Is there battery positive voltage between terminal +B and Bellow 10 V Locate cause and repair, or recharge battery.
body ground?

Yes

Is there battery positive voltage between terminal ACC and Bellow 10 V Locate cause and repair, or recharge battery.
body ground?

Yes

Adjust or replace clock.

2005 LEXUS IS300 (RM1140U)

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: Date
: 2215

BE-212
BODY ELECTRICAL - CLOCK
BE0G1-13

LOCATION

A/C Control Assembly

Clock

Passenger Side
Junction Block

MPX-B Fuse

Ignition Switch

Driver Side Junction Block

RADIO No. 2 Fuse

I27835

2005 LEXUS IS300 (RM1140U)

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: Date
: 2216

 BE-213
BODY ELECTRICAL - GARAGE DOOR OPENER SYSTEM

GARAGE DOOR OPENER SYSTEM BE0L6-04

REGISTRATION PROCEDURE
1. NEW CODE REGISTRATION
NOTICE:

If pressing the switch of the original transmitter to
register the code, the system might operate.

When registering the transmitter codes such as for
garage or gate, check that there is nobody around
those places then register.
(a) Press the switch for the item to be registered for 20 se-
conds
HINT:
When transferring to registration mode, LED (red) blinks in 1 Hz
cycle.

(b) In the condition of (a), bring the original transmitter to with-

in 1-inch area around the garage door opener and press
the switch. (code transmitting).
HINT:
When code registration completes correctly, LED (red) blinks in
5.6 Hz cycle.

I17842

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BE-214
BODY ELECTRICAL - GARAGE DOOR OPENER SYSTEM

New code registration timing chart

PRESSED
GARAGE DOOR
OPENER SWITCH
RELEASE

ENTER
20 sec.
LEARN MODE
EXIT

LED ON
OPERATION
OFF
LED flashes
at a rate of 1 Hz
LED flashes at a
rate of 5.6 Hz
ON
ORIGINAL
TRANSMITTER
OFF

I03487

If a code can not be registered, observe the following condi-

tions.
HINT:

If the battery of original transmitter is consumed.

Press the switch of the transmitter repeatedly in registra-
tion mode, as some transmitters stop transmitting for 1 to
2 seconds.

This system is not applicable to the garage door opener
which had been made before 1982.
2. CODE DELETION
(a) Press the switches at both ends of garage door opener
simultaneously for 20 seconds.
HINT:
When transferring to deletion mode, LED (red) blinks in 6 Hz
cycle.
(b) When releasing the switch within 10 seconds after trans-
ferring to deletion mode, all the registered codes will be
erased.
HINT:
Press the switch until blinking in 6 Hz cycle stops, so that the
default code for check is set.

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 BE-215
BODY ELECTRICAL - GARAGE DOOR OPENER SYSTEM

Code deletion timing chart

GARAGE DOOR PRESSED

OPENER SWITCH
(Switch at both end)
Enter erase mode to erase all 3 channels
RELEASE
ON
CLEAR/DEFAULT 10 SEC. LOAD DEFAULT
20 SEC.
MODE
OFF
ON
LED
OPERATION
OFF
LED flashes at a rate of 6 HZ

I03488

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BE-216
BODY ELECTRICAL - GARAGE DOOR OPENER SYSTEM
BE0L7-05

LOCATION

Sedan: Garage Door Opener Switch (in LH side Sun Visor)

Wagon: Garage Door Opener Switch (in LH side Sun Visor)

I27836
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 BE-217
BODY ELECTRICAL - GARAGE DOOR OPENER SYSTEM
BE0L8-02

REMOVAL
REMOVE LH SIDE SUN VISOR
(a) Remove the 2 screws.
(b) Disconnect the garage door opener switch connector.

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BE-218
BODY ELECTRICAL - GARAGE DOOR OPENER SYSTEM
BE0L9-04

INSPECTION
1. INSPECT GARAGE DOOR OPENER
Press the switch and check that each LED (red) lights up.
Even if only one switch is found not to light up, replace it.

I17841

2. INSPECT GARAGE DOOR OPENER REGISTRATION

AND TRANSMITTING
HINT:
Use the home link tester made by KENT MORE for this test.
As it is necessary to record the code of the hand held transmit-
ter, customer’s code will be erased. When the inspection com-
pletes, please register the customer’s again.
(a) Check that the code of hand held transmitter for inspec-
I17842 tion can be recorded.
(See page BE-213 )
If the code can not be registered, replace garage door opener.

(b) Press the switch which an inspection code has been reg-
istered for and check that LED (green) of the home link
tester lights up.
If the LED (green) does not light up, replace the garage door
opener.

I17843

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 BE-219
BODY ELECTRICAL - GARAGE DOOR OPENER SYSTEM

3. INSPECT GARAGE DOOR OPENER CIRCUIT

Wire Harness Side
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.

I04287

Tester connection Condition Specified condition

2 - Ground Always Continuity
1 - Ground Always Battery positive voltage
If the circuit is not as specified, inspect the circuits connected
to other parts.

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BE-220
BODY ELECTRICAL - GARAGE DOOR OPENER SYSTEM
BE0LA-02

INSTALLATION
INSTALL GARAGE DOOR OPENER SWITCH
(a) Connect the garage door opener switch connector.
(b) Install the 2 screws and the LH side sun visor.

2005 LEXUS IS300 (RM1140U)

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: 2224

 BE-221
BODY ELECTRICAL - ENGINE IMMOBILISER SYSTEM

ENGINE IMMOBILISER SYSTEM

BE27I-02

REGISTRATION PROCEDURE
HINT:
In case of having lost all the already registered master keys, you are not able to do additional registration
or deletion. Change the ECM and then must register the new key codes according to the following registra-
tion procedure of the automatic registration mode.
1. KEY REGISTRATION IN AUTOMATIC REGISTRATION MODE
(a) Registration of a new transponder key.
HINT:

This must be done when you install a new ECM.

The new ECM is on the automatic key code registration mode. The already fixed number of key codes
for this ECM can be registered.
On this type of vehicle, up to 3 key codes can be registered.

In the automatic registration mode, the last key registered becomes sub-key.

START Security indicator blinks until the first

key is inserted. The indicator lights up
after the key registration.

Insert the key in the key cylinder.

Security Indicator ON

Under registration
Security Indicator
OFF

Registration completion

Remove the key.

Security Indicator ON
(After the last key (sub-key)
Yes Will you register the
has been registered and re-
next key?
move the key, the indicator
blinks.)
No

END

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BE-222
BODY ELECTRICAL - ENGINE IMMOBILISER SYSTEM

HINT:

When a key is not inserted in the key cylinder on the automatic registration mode, the security indicator
always lights on.

When the immobiliser system operates normally and the key is pull out, the security indicator blinks.

When key code registration could not be performed on the automatic registration mode, code 2-1 is
output from the security indicator and when inserting the already registered key, code 2-2 is output.
Blinks Code 2-1 Code2-2
1.2 Sec. 0.25 Sec. 1 Sec. 0.25 Sec. 1 Sec.

0.8 Sec. 0.25 Sec. 0.5 Sec. 0.25 Sec.0.5 Sec.

(b) Automatic registration mode completion

If completing the mode forcibly when more than 1 key code have been registered on the automatic
registration mode, perform the following procedures.
After 1 more key code have been registered with master key, perform step (1) or (2) without pulling
the key out or inserting the already registered key.
(1) Depress and release brake pedal 5 times or more within 15 sec.
(2) With the hand-held tester, require automatic registration mode completion.

2. REGISTRATION OF ADDITIONAL MASTER KEY

There are 2 ways for registration of additional master key, one way is depressing brake pedal and accelera-
tion pedal and the other way is using hand-held tester.
HINT:

It is possible to register up to 7 master key codes including the already registered key code.

When any operation time described below is over, registration mode completes.

When the next procedure is performed while the timer is working, the timer completes counting time,
then next timer starts.

When replacing ”Ignition Cylinder Key Set” or ”Lock Cylinder Set” and register according to the follow-
ing procedure using the original master key. However, after the registration of the additional master
key, as the original master key and the original sub-key is not necessary any more, so erase registra-
tion of those key codes.

2005 LEXUS IS300 (RM1140U)

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 BE-223
BODY ELECTRICAL - ENGINE IMMOBILISER SYSTEM

(1) Depressing brake pedal and acceleration pedal:

Insert already registered master key in the key

cylinder

Depress and release the acceleration pedal 5 Within 15 sec.

times.

Within 20 sec.
Depress and release the brake pedal 6 times,
and remove the master key.

Within 10 sec.
Insert key to be registered in key cylinder.

Within 10 sec.
Depress and release the acceleration pedal 1
time. (Security indicator blinks)
Within 10 sec.

After 60 sec. additional master key is registered.

(Security indicator is OFF)

Yes Will you register the

next key?

No

The registration mode completes when pulling

out the key and depressing and releasing the
brake pedal once or more within 10 secs. after
indicator has been off or 10 sec. have passed.

2005 LEXUS IS300 (RM1140U)

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BE-224
BODY ELECTRICAL - ENGINE IMMOBILISER SYSTEM

(2) Using hand-held tester:

Insert already registered master key in the key cylinder

and turn the ignition switch ON.

Using hand-held tester select master key registration.

Within 20 sec.

Remove the master key.

Within 10 sec.
Insert key to be registered in key cylinder.
(Security indicator blinks)

After 60 sec., additional master key is registered.

(Security indicator OFF)

The registration mode completes when pulling

out the key and depressing and releasing the
brake pedal once or more within 10 sec. after in-
dicator has been off or 10 sec. have passed.

HINT:
Please follow the screen of the hand-held tester for more detailed procedure.

2005 LEXUS IS300 (RM1140U)

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 BE-225
BODY ELECTRICAL - ENGINE IMMOBILISER SYSTEM

3. REGISTRATION OF ADDITIONAL SUB-KEY

There are 2 ways for registration of additional sub-key, one way is depressing brake pedal and acceleration
pedal and the other way is using hand-held tester.
HINT:

It is possible to register up to 3 sub-key codes including the already registered key code.

When any operation time described below is over, registration mode completes.

When the next procedure is performed while the timer is working, the timer completes counting time,
then next timer starts.
(1) Depressing brake pedal and acceleration pedal:
Insert already registered master key in the key
cylinder

Within 15 sec.
Depress and release the acceleration pedal 4
times.

Within 20 sec.
Depress and release the brake pedal 5 times,
and remove the master key.

Within 10 sec.
Insert key to be registered in key cylinder.

Within 10 sec.
Depress and release the acceleration pedal 1
time. (Security indicator blinks)
Within 10 sec.

After 60 sec. additional sub-key is registered.

(Security indicator is OFF)

Yes Will you register the

next key?

No

The registration mode completes when pulling

out the key and depressing and releasing the
brake pedal once or more within 10 sec. after in-
dicator has been off or 10 sec. have passed.

2005 LEXUS IS300 (RM1140U)

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BE-226
BODY ELECTRICAL - ENGINE IMMOBILISER SYSTEM

(2) Using hand-held tester:

Insert already registered master key in the key cylinder

and turn the ignition switch ON.

Using hand-held tester select sub-key registration.

Within 20 sec.

Remove the master key.

Within 10 sec.

Insert key to be registered in key cylinder.

(Security indicator blinks)

After 60 sec., additional sub-key is registered.

(Security indicator OFF)

The registration mode completes when pulling

out the key and depressing and releasing the
brake pedal once or more within 10 sec. after in-
dicator has been off or 10 sec. have passed.

HINT:
Please follow the screen of the hand-held tester for more detailed procedure.

2005 LEXUS IS300 (RM1140U)

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: 2230

 BE-227
BODY ELECTRICAL - ENGINE IMMOBILISER SYSTEM

4. ERASURE OF TRANSPONDER KEY CODE

There are 2 ways for erasure of transponder key code, one way is depressing brake pedal and acceleration
pedal and the other way is using hand-held tester.
HINT:

Delete all other master and sub-key codes leaving the master key code to use the operation. When
using the key which was used before deletion, it is necessary to register the code again.

When any operation time described below is over, registration mode completes.

When the next procedure is performed while the timer is working, the timer completes counting time,
then next timer starts.

(1) Depressing brake pedal and acceleration pedal:

1. Insert master key in the key cylinder.

Within 15 sec.
2. Depress and release the acceleration pedal 6 times.

Within 20 sec.
3. Depress and release the brake pedal 7 times.

Within 10 sec.
4. Remove the master key.

5. Leave the vehicle more than 20 sec. without any

operation.

END
(Key code erased)

HINT:
If the key cannot be pulled out within 30 sec. from the first brake depression in
the step 3, the key code deletion is canceled.

2005 LEXUS IS300 (RM1140U)

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BE-228
BODY ELECTRICAL - ENGINE IMMOBILISER SYSTEM

(2) Using hand-held tester:

1. Insert already registered master key in the key cylinder

and turn the ignition switch ON.

2. Require key code deletion from hand-held tester.

(Security indicator blinks)

Within 10 sec.

3. Remove the master key.

END
(Key code erased)

HINT:

When the key cannot be pulled out in the step 3, key code deletion is canceled.
(Security indicator is OFF.)

Please follow the screen of the hand-held tester for more detailed procedure.

2005 LEXUS IS300 (RM1140U)

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: 2232

 BE-229
BODY ELECTRICAL - ENGINE IMMOBILISER SYSTEM
BE02Q-26

LOCATION

ECM

Driver Side
Junction Block

IGN Fuse

Transponder Key Coil

Transponder Key Amplifier
I27837

2005 LEXUS IS300 (RM1140U)

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: 2233

BE-230
BODY ELECTRICAL - ENGINE IMMOBILISER SYSTEM
BE0G8-10

2 1 INSPECTION
INSPECTION TRANSPONDER KEY COIL CONTINUITY
Check that continuity exists between terminals 1 and 2.
If continuity is not as specified, replace the coil.

I04266

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2234

 BE-231
BODY ELECTRICAL - HORN SYSTEM

HORN SYSTEM
BE0FY-31

LOCATION
Engine Room Junction Block

HORN Relay

HORN Fuse

Horn

Horn Switch

I27838

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2235

BE-232
BODY ELECTRICAL - HORN SYSTEM
BE0FZ-20

INSPECTION
1. INSPECT HORN SWITCH
(a) Disconnect the negative (-) terminal from the battery.
(b) Remove the left and right covers from the steering wheel.
(c) Using a torx socket wrench, loosen the 2 bolts.
(d) Pull up the horn pad and place it on the steering column,
as shown.
HINT:
I11469
Do not disconnect the connector from the horn pad.
(e) Disconnect the connector from the slip ring.

(f) Check that no continuity exists between terminal 6 of the

6
connector and body ground.
(g) Check that continuity exists between terminal 6 of the
connector and body ground when the horn contact plate
is pressed against the steering spoke assembly.
If continuity is not as specified, repair or replace the steering
wheel or wire harness as necessary.
(h) Install the horn pad in place and using a torx socket
I11470 wrench, torque the 2 bolts.
Torque: 7.1 N·m (72 kgf·cm, 62 in.·lbf)
(i) Install the left and right covers.
(j) Connect the negative (-) terminal to the battery.

2. INSPECT HORN OPERATION

Connect the positive (+) lead from the battery to the terminal
and negative (-) lead to the horn body and check that the horn
blows.
If operation is not as specified, replace the horn.
3. INSPECT HORN SWITCH CIRCUIT
(See page DI-800 )

N10342

2005 LEXUS IS300 (RM1140U)

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: 2236

 BE-233
BODY ELECTRICAL - HORN SYSTEM

4. INSPECT HORN RELAY CONTINUITY

1 2
Condition Tester connection Specified condition
Always 1-2 Continuity
3 5
Apply B+ between
3-5 Continuity
5 terminals 1 and 2.
1 2
If continuity is not as specified, replace the relay.
5. INSPECT HORN RELAY CIRCUIT
3 (See page DI-800 )
I01200

2005 LEXUS IS300 (RM1140U)

Author
: Date
: 2237