54B-1

GROUP 54B

SIMPLIFIED WIRING
SYSTEM (SWS)
CONTENTS

GENERAL DESCRIPTION. . . . . . . . . 54B-2 WINDSHIELD WIPER AND WASHER . . . . 54B-218

COMMUNICATION METHOD . . . . . . . . . . 54B-2 GENERAL DESCRIPTION CONCERNING THE
WINDSHIELD WIPER AND WASHER . . . . 54B-218
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . 54B-2
REAR WIPER AND WASHER . . . . . . . . . . 54B-253
GENERAL DESCRIPTION CONCERNING
SWS DIAGNOSIS . . . . . . . . . . . . . . . 54B-6 THE REAR WIPER AND WASHER . . . . . . 54B-253
GENERAL DESCRIPTION . . . . . . . . . . . . . 54B-6 SEAT BELT WARNING LIGHT . . . . . . . . . . 54B-274
BEFORE CARRYING OUT GENERAL DESCRIPTION CONCERNING
TROUBLESHOOTING . . . . . . . . . . . . . . . . 54B-6 SEAT BELT WARNING LIGHT . . . . . . . . . . 54B-274
SWS DIAGNOSTIC TROUBLESHOOTING HEADLIGHT AND TAILLIGHT . . . . . . . . . . 54B-284
STRATEGY. . . . . . . . . . . . . . . . . . . . . . . . . 54B-6 GENERAL DESCRIPTION CONCERNING
HOW TO CONNECT SWS MONITOR . . . . 54B-7 HEADLIGHT AND TAILLIGHT . . . . . . . . . . 54B-284
HOW TO USE SWS MONITOR . . . . . . . . . 54B-10 FLASHER TIMER . . . . . . . . . . . . . . . . . . . . 54B-360
GENERAL DESCRIPTION CONCERNING
HOW TO CHECK ECUs . . . . . . . . . . . . . . . 54B-12
FLASHER TIMER . . . . . . . . . . . . . . . . . . . . 54B-360
SERVICE DATA CHECK . . . . . . . . . . . . . . 54B-12
FOG LIGHT . . . . . . . . . . . . . . . . . . . . . . . . . 54B-393
PULSE CHECK. . . . . . . . . . . . . . . . . . . . . . 54B-21 GENERAL DESCRIPTION CONCERNING
FOG LIGHT . . . . . . . . . . . . . . . . . . . . . . . . . 54B-393
SYMPTOM CHART . . . . . . . . . . . . . . 54B-22 INTERIOR LIGHT . . . . . . . . . . . . . . . . . . . . 54B-416
GENERAL DESCRIPTION CONCERNING
SYMPTOM PROCEDURES . . . . . . . . 54B-27 INTERIOR LIGHT . . . . . . . . . . . . . . . . . . . . 54B-416
THEFT-ALARM SYSTEM . . . . . . . . . . . . . . 54B-462
TONE ALARM. . . . . . . . . . . . . . . . . . . . . . . 54B-70
GENERAL DESCRIPTION CONCERNING GENERAL DESCRIPTION CONCERNING
THE THEFT-ALARM SYSTEM . . . . . . . . . . 54B-462
TONE ALARM. . . . . . . . . . . . . . . . . . . . . . . 54B-70
CENTRAL DOOR LOCKING SYSTEM. . . . 54B-87
GENERAL DESCRIPTION CONCERNING THE
INPUT SIGNAL CHART . . . . . . . . . . . 54B-491
CENTRAL DOOR LOCKING SYSTEM. . . . 54B-87
POWER WINDOWS . . . . . . . . . . . . . . . . . . 54B-137 INPUT SIGNAL PROCEDURES. . . . . 54B-493
GENERAL DESCRIPTION CONCERNING
THE POWER WINDOWS . . . . . . . . . . . . . . 54B-137 CHECK AT ECU TERMINAL . . . . . . . 54B-615
KEYLESS ENTRY SYSTEM. . . . . . . . . . . . 54B-192
GENERAL DESCRIPTION CONCERNING
SPECIAL TOOLS . . . . . . . . . . . . . . . . 54B-620
THE KEYLESS ENTRY SYSTEM. . . . . . . . 54B-192
SUNROOF . . . . . . . . . . . . . . . . . . . . . . . . . 54B-202 ON-VEHICLE SERVICE . . . . . . . . . . . 54B-622
GENERAL DESCRIPTION CONCERNING ADJUSTMENT PROCEDURES OF SWS
THE SUNROOF . . . . . . . . . . . . . . . . . . . . . 54B-202 FUNCTION
<Vehicles with keyless entry system> . . . . . 54B-622
54B-2 SIMPLIFIED WIRING SYSTEM (SWS)
GENERAL DESCRIPTION

GENERAL DESCRIPTION
COMMUNICATION METHOD
M1549013000503

FRONT-ECU ETACS-ECU

SCAN TOOL MB991958

SUNROOF MOTOR
ASSEMBLY*¹
(SUNROOF-ECU)

SWS MONITOR KIT

COLUMN SWITCH
RV METER*² MB991813
(COLUMN-ECU)
NOTE
*¹: Vehicles with sunroof
*²: Vehicles with RV meter
AC203687 AE

As shown below, signal wires used exclusively for

transmitting multiplex signal data connect the
ETACS-ECU, front-ECU, column switch (incorporat-
ing the column-ECU), sunroof motor assembly
(incorporating the sunroof-ECU), RV meter and
these components communicate with each other.
OPERATION
M1549013100522

TONE ALARM FUNCTION • The ETACS-ECU sounds the tone alarm for six
. seconds if the ignition switch is turned "ON" while
Ignition key reminder tone alarm function the seat belt switch is on (the driver's seat belt is
When the driver's door is opened (driver's door not fastened).
switch ON) without removing the ignition key [ignition • The ETACS-ECU sounds the tone alarm 12
switch to the "LOCK" (OFF) or "ACC" position], the cycles (after 0.5 seconds) if the seat belt switch is
tone alarm will sound intermittently to remind the on (driver's seat belt is not fastened) when sixty
driver that the ignition key has not been removed. seconds or more have elapsed since the ignition
. switch is turned "ON". One cycle consists of five-
Light reminder tone alarm function second "on" and then three-second "off".
When the driver's door is opened (driver's door NOTE: The ETACS-ECU stops sounding immedi-
switch ON) with lighting switch (taillight switch or ately when the seat belt witch is off (driver's seat belt
headlight switch) in the ON position and ignition is fastened) or the ignition switch is turned to the
switch in the "LOCK" (OFF) or "ACC" position, the "OFF" or "ACC" position while the seat belt tone
tone alarm will sound continuously to remind the alarm function is working.
driver that the lights (taillights or headlights) are ON.
This function does not work if the taillights or head- .

RV meter tone alarm function

lights are switched off through the headlight auto-
When tone alarm sounding is requested from the RV
matic shutdown function. In addition, the ignition key
meter, the ETACS-ECU activates the built-in tone
reminder tone alarm function has a priority over this
alarm. The RV meter will "beep" when adjusting the
function.
brightness level, only with the ignition key in the
.
"ACC" position.
Seat belt tone alarm function
If any of the following conditions is met with the igni- CENTRAL DOOR LOCKING SYSTEM
tion switch at "ON" or "ST", the ETACS-ECU sounds .

the tone alarm by using the driver's seat belt switch Central door locking system operation
signal. • When the driver's inside lock knob is locked or
unlocked, the lock relay inside the ETACS-ECU
turns on to lock or unlock all doors.

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 SIMPLIFIED WIRING SYSTEM (SWS)
GENERAL DESCRIPTION
54B-3
• With all the doors locked, turning the key in the SUNROOF
driver's door unlocks the door. Turning it again
makes the door unlock relay close to send a sig- Sunroof operation
nal for unlocking all doors. • All of the slide open/close, tilt up/down, and stop
• When the door lock switch (built into the power operations can be performed by a single switch.
window switch) is operated, the lock or unlock • When the roof lid glass is tilted up, the sunshade
relay inside the ETACS-ECU is turned on to lock opens approximately 98 mm (3.9 inches) in com-
or unlock all doors. bined operation with the roof lid glass for better
ventilation.
.

• A jam preventing mechanism has been adopted.

Forgotten key prevention function
When a slide-close or tilt-down operation is
• If the driver's door is open (door switch turned
blocked by an external force, the roof lid glass
ON), when the key is inserted in the ignition
moves back and stops.
switch (key reminder switch turned OFF), the
• The electronic sunroof system cannot be oper-
ETACS-ECU activates the door unlock relay for
ated manually. The sunroof wrench that was used
0.5 second to prevent the door from being locked.
in previous models is not provided. If the anti-jam
• If you try to lock either the driver's or passenger's
mechanism reverses the sunroof five or more
door when the passenger's door is open (door
times consecutively due to deformation or other
switch turned ON) and the key is inserted in the
problem with the sunroof components, it deacti-
ignition switch (key reminder switch turned OFF),
vates and allows the sunroof to make small
the ETACS-ECU prevents the doors from being
movements [30 mm (1.2 inches)] until it closes
locked by activating the door unlock relay for 0.5
completely.
second. .

Sunroof timer function

POWER WINDOW RELAY CONTROL When the ignition switch is turned from "ON" position
.
to "LOCK" (OFF) or "ACC" position, the sunroof can
Power window relay operation
be operated for thirty seconds. If any door is opened
If the ignition switch is turned to "ON" position, the
for the 30 seconds, the sunroof will be immobilized at
power window relay is energized to activate the
that point.
power windows.
.
WINDSHIELD WIPERS AND WASHERS
Power window timer function .

When the ignition switch is turned from the "ON" Windshield low-speed (and high-speed) wiper
position to "LOCK" (OFF) or "ACC" position, the operation
power windows can be operated for 30 seconds. If • If the windshield low-speed wiper switch is turned
any door is opened for the 30 seconds, the power to the ON position with the ignition switch at the
windows will be immobilized at that point. "ACC" or "ON" position, the column switch sends
a low-speed wiper ON and high-speed wiper OFF
KEYLESS ENTRY SYSTEM signals to the front-ECU. This turns the wiper sig-
If the RKE transmitter "LOCK" or "UNLOCK" switch nal on and the wiper speed control relay off (low-
is pressed while the ignition key is removed, the speed), causing the wipers to operate at low-
doors can be locked or unlocked. If the doors are speed.
closed, the hazard warning lights, the dome light and • If the windshield high-speed wiper switch is
the horn will operate due to answerback function. turned to the ON position, the column switch
Because of the answerback function, the hazard sends a low-speed wiper OFF and high-speed
warning lights flash twice, and the horn sounds once, wiper ON signals to the front-ECU. This turns
the dome light flashes twice when the doors are both the wiper signal and the wiper speed control
locked. Meanwhile, when the doors are unlocked, relay on (high-speed), causing the wipers to
the hazard warning lights flash and the dome light operate at high-speed.
illuminates for 15 seconds. The hazard and the horn NOTE: The windshield wiper speed is changed by
answerback functions can be cancelled by using the wiper speed control relay incorporated in front-ECU.
RKE transmitter. When the wiper speed control relay is at "ON" posi-
tion, the windshield wiper operates at high-speed,
and the wiper speed control relay is at "OFF" posi-
tion, the windshield wiper operates at low-speed.

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54B-4 SIMPLIFIED WIRING SYSTEM (SWS)
GENERAL DESCRIPTION

washer switch continues more than 0.2 second,

.

Windshield intermittent wiper operation

The ETACS-ECU calculates the wiper operation the wiper performs the same movement as nor-
interval according to the voltage signal sent from the mal condition from the time when 0.2 second has
column switch. Then the ETACS-ECU sends a signal elapsed and then returns to the intermittent
to the front-ECU. The front-ECU determines the motion.
wiper operation interval and turns on the wiper relay
signal relay. This causes the wiper auto stop relay to REAR WIPER AND WASHER
turn on. Then the wiper auto stop relay will turn off
.

Rear wiper operation

after the wipers reach the park position. This causes If the rear wiper and washer switch is turned to "INT"
the wiper signal relay and then the wipers to turn off. position with the ignition switch at "ACC" or "ON"
If the wiper signal relay remains off for the wiper position, the ETACS-ECU turns ON the rear wiper
operation interval, the relay turns on again, causing drive signal for three seconds (approximately two
the wipers to operate in intermittent mode. cycles), then 7.4 seconds later the intermittent
.
motion operates every eight seconds. If the selector
Windshield mist wiper operation lever is moved to the "R" position when the rear
• If the windshield mist wiper switch is turned to the wiper and washer switch is turned to the "INT" posi-
ON position with the ignition switch at the "ACC" tion and the ignition switch is at the "ACC" or "ON"
or "ON" position, the mist wiper high-speed oper- position, the transmission range switch "R" turns ON.
ation signal is sent to the front-ECU. This signal One second later, the ETACS-ECU turns ON the rear
turns on the wiper speed control relay, causing wiper drive signal for three seconds (approximately
the wipers to work at high-speed while the mist two cycles). Then, 7.4 seconds later, the intermittent
switch is on. motion of eight seconds' cycle is restored.
• While the windshield mist wiper switch remains
turned on when the intermittent mode is still work-
.

Rear washer operation

ing, the wipers work as the mist wiper. However, If the rear wiper and washer switch is turned to the
the wipers return to the intermittent mode again ON (washer) position with the ignition switch at the
when the switch is changed back to "INT" posi- "ACC" or "ON" position, the rear washer ON signal is
tion. sent to the ETACS-ECU, causing the rear wiper sig-
• To prevent the windshield mist wiper from operat- nal to turn on after 0.3 seconds. After the rear
ing when the windshield wiper switch is turned washer switch signal turns off, the rear wiper signal
OFF, the windshield mist wiper does not work for turns off in three seconds. If the rear washer switch is
0.5 second after the windshield intermittent wiper turned to the ON position while the rear wiper is in
switch, the windshield low-speed wiper switch intermittent mode, the rear washer works for that
and the windshield high-speed wiper switch are period when the washer switch remains on. Then the
turned OFF. rear wipers return to the intermittent mode.
.

Windshield washer operation SEAT BELT WARNING LIGHT

• If the windshield washer switch is turned to ON If any of the following conditions is met with the igni-
position with the ignition switch at "ACC" or "ON" tion switch at "ON" or "ST", the ETACS-ECU illumi-
position, the windshield washer ON signal is sent nates the indicator light by using the driver's seat belt
to the front-ECU. After 0.3 seconds, the wind- switch signal.
shield wiper signal to turn on. After the windshield • The ETACS-ECU illuminates the indicator light
washer switch signal turns off, the windshield for six seconds if the ignition switch is turned
wiper signal turns off in three seconds. "ON" while the seat belt switch is on (the driver's
• If the windshield washer switch is turned on while seat belt is not fastened).
the windshield wiper is at intermittent mode, • The ETACS-ECU flashes the indicator light 12
when the windshield washer switch is turned OFF cycles (after 0.5 seconds) if the seat belt switch is
within 0.2 second, the wiper works only once to on (driver's seat belt is not fastened) when sixty
perform mist operation by the windshield washer seconds or more have elapsed since the ignition
switch. When the ON condition of the windshield switch is turned "ON". One cycle consists of five-
second "on" and then three-second "off".

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 SIMPLIFIED WIRING SYSTEM (SWS)
GENERAL DESCRIPTION
54B-5
NOTE: The ETACS-ECU stops flashing the indicator DOME LIGHT
light immediately when the seat belt witch is off With the dome light switch in the "door controlled
(driver's seat belt is fastened) or the ignition switch is operation" (middle) position, the ETACS-ECU con-
turned to the "OFF" or "ACC" position while the seat trols the dome light operation as follows:
belt tone alarm function is working. • When a door is opened from outside or inside
[with the ignition switch turned to "LOCK" (OFF)]:
HEADLIGHT When a door is opened, the ETACS-ECU causes
.

Headlight automatic shutdown function the dome light to be illuminated at 100% intensity.
When the headlights or taillights are on, and the igni- When the door is closed, it dims the dome light to
tion switch is turned from "ON" to "LOCK" (OFF) or 65% intensity and approximately 30 seconds
"ACC" position or the ignition key is removed, the later, turns out the light completely. During this
headlights will be switched off in three minutes. If the period (timer controlled period), the dome light
driver's door is opened within that three-minute goes out if the ignition switch is turned "ON" or
period, the headlights will be switched off automati- the doors are locked.
cally. This prevents the battery from discharging. • When a door is opened or closed with the ignition
switch in the "ON" position: The dome light illumi-
NOTE: The headlight automatic shutdown function nates at 100% intensity when a door is opened
can be disabled by the SWS configuration function. and turned out when it is closed.
Refer to P.54B-622. • When no door is opened and the ignition key is
. removed: The dome light is illuminated at 100%
Headlight dimmer switch automatic resetting intensity and turned off approximately 30 sec-
function onds later. During that time (timer-controlled
This function allows the dimmer switch to be reset to period), the dome light goes out if the ignition key
the low-beam position whenever the headlight switch is inserted and turned to "ON" or the door locking
is turned to the ON position. system is activated.
• Dome light's answerback operation in response
FLASHER TIMER to door lock control by keyless entry system: To
.

allow the driver to confirm the doors have locked

Turn-signal light
by the keyless entry system, the ETACS-ECU
When the ignition switch is turned to the "ON" posi-
causes the dome light to blink twice when the
tion and turn-signal light switch is placed in the ON
doors are locked by the RKE system and to illu-
position for right or left turn-signaling, the system
minate for approximately 15 seconds when the
generates turn-signal light drive signals (flashing sig-
doors are locked. The dome light's answerback
nals). The system also notifies of a blown turn-signal
operation in response to a keyless entry system
light bulb by shortening the flashing intervals of the
control action is accompanied by flashing of the
corresponding indicator light.
hazard warning lights.
.

Hazard warning light THEFT-ALARM SYSTEM

The system detects a change from OFF to ON of the .

hazard warning input signal and activates or shuts off Theft-alarm System Operation
the hazard warning lights accordingly. If a door, back door or hood is opened, when the
theft-alarm system has been armed the horn (theft-
FOG LIGHT alarm horn and horn) will sound and headlights flash
The fog light switch becomes active only when the (high-beam) intermittently for a period of 180 sec-
headlights are at the low-beam mode. Therefore, if onds.
the headlights are turned off, the fog lights will also .

be switched off. When the headlights are turned on Panic Alarm Function
during the next key cycle, the fog lights will be off With the theft-alarm function armed, pressing the
regardless of the fog light switch position. panic button on the keyless entry system transmitter
causes the horn (theft-alarm horn and horn) to sound
for about 180 seconds in an attempt to prevent theft.
The alarm is turned off by pressing any switch on the
transmitter.

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54B-6 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS

CONFIGURATION FUNCTION
The keyless entry hazard answerback function and
the headlight automatic shutdown function can be
adjusted by the special operation. Or they can be
returned to the initial condition.

SWS DIAGNOSIS
GENERAL DESCRIPTION
BEFORE CARRYING OUT TROUBLESHOOTING
M1549014700679
Before carrying out troubleshooting, check the fol- • Make sure that fuses and fusible links related to
lowing two items. relevant systems are not blown.
• Make sure that the ETACS-ECU, the junction
block (J/B), the front-ECU and the engine com-
partment relay box are connected securely.
SWS DIAGNOSTIC TROUBLESHOOTING STRATEGY
M1549000500865
1. Gather information about the problem from the • If "NG" is displayed for any of the related ECUs,
customer. something may be wrong with the ECU for which
"NG" appears, its power supply or grounding sys-
2. Verify that the condition described by the
tem, or a wiring harness or connector between
customer exists. the SWS monitor and the ECU. Check the wiring
NOTE: If an error occurs in the SWS communica- harness and connectors associated with the ECU
tion line, the ECU isolated from the communica- and examine the ECU itself.
tion line performs a fail-safe or backup operation, 5. Service data on the SWS monitor
so the problem may not match the one shown in
the Trouble Symptom Chart. However, the cause Select the defective function from the function-
of the failure can be tracked down by performing specific diagnostic menu, and check the service
the following troubleshooting with the SWS moni- data that appears for each function item.
tor. NOTE: . In addition to the function-specific diag-
3. Version number and destination check nostic menu, a service data menu is available for
SWS monitor service data to check all items for
Check whether the SWS version number (0) and each ECU.
destination (North America) meet the vehicle (1) When the SWS communication line is
specifications. If they are different, replace the monitored.
ETACS-ECU with a correct one. (2) You can determine whether the problem lies in
4. Use scan tool to select "ECU COMM CHK" on the the input or output signal circuit system by
SWS monitor display. checking whether communication data is
correct.
Check whether the communication status of the
• The switch condition does not meet the service
input- or output-signal-side ECU associated with data display: Input signal system related to defec-
the defective function is normal. tive functions
• If "OK" is displayed for all related ECUs, they • The switch condition meets the service data dis-
communicate with each other normally and the play: Output signal system related to defective
input or output signal circuit system may be functions
defective. Therefore, check SWS monitor service 6. Check of input signal circuit system
data.
Check relevant switch, sensor, input signal-side
ECU and their wiring harness and connector.
7. Check of output signal circuit system
Check an output signal-side ECU, electrical load
components and their wiring harness and
connector.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS
54B-7
HOW TO CONNECT SWS MONITOR
M1549014800665
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
• MB991863: SWS Monitor Harness (For 13-pin)

CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958. Connect
the main harness B MB991911 before connecting the SWS
monitor harness (for 13-pin) MB991862 or the SWS moni-
tor harness (for column-ECU) MB991812. Be sure to con-
nect SWS monitor cartridge MB991806 after turning on the
V.C.I. MB991924.
.

SWS communication line connectiong method <SWS

monitor harness (for 13-pin)>
DATA LINK DATA LINK 1. Ensure that the ignition switch is at the "LOCK" (OFF)
CONNECTOR CONNECTOR position.
(13-PIN) (16-PIN)
2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824
and the personal computer.
4. Connect special tool MB991911 to special tool MB991824.
5. Connect special tool MB991911 to the data link connector
MB991911 (16-pin).
6. Connect special tool MB991812 to data link connector (13-
MB991806
MB991862 pin).
MB991824

MB991827 AC309091AB

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54B-8 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS

7. Connect special tool MB991862 to special tool MB991806.

MB991806 8. Connect special tool MB991806 to special tool MB991824.
MB991824
9. Turn the power switch of special tool MB991824 to the "ON"
MB991911 position.
NOTE: When special tool MB991824 is energized, special
MB991862 tool MB991824 indicator light will be illuminated in a green
color.
10.Start the MUT-III system on the personal computer.
MB991827
AC208681AD

SWS communication line connectiong method <SWS

monitor harness (for column-ECU)>
1. Ensure that the ignition switch is at the "LOCK" (OFF)
DATA LINK
CONNECTOR position.
2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824
and the personal computer.
4. Connect special tool MB991911 to special tool MB991824.
5. Connect special tool MB991911 to the data link connector.
MB991911

MB991824

MB991827 AC307591 AB

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 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS
54B-9
6. Remove the steering column cover.
COLUMN SWITCH 7. Remove the steering column switch connector.
CONNECTOR
8. Connect special tool MB991812 to column switch connector.
SWS MONITOR
COLUMN SWITCH HARNESS (FOR
CONNECTOR AT COLUMN-ECU)
HARNESS SIDE

AC102200 AB

9. Connect special tool MB991812 to special tool MB991806.

MB991806 10.Connect special tool MB991806 to special tool MB991824.
MB991824
11.Turn the power switch of special tool MB991824 to the "ON"
MB991911 position.
NOTE: When special tool MB991824 is energized, special
MB991812 tool MB991824 indicator light will be illuminated in a green
color.
12.Start the MUT-III system on the personal computer.
MB991827
AC208681AC

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54B-10 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS

HOW TO USE SWS MONITOR

M1549020400291
To carry out troubleshooting, operate scan tool
MB991958 (MUT-III Sub Assembly) as follows.
Function Select Menu
Menu

TIR Interactive System Select Special Function

Technical Infomation Diagnosis
Retrieval

Select "Interactive Diagnosis"

CAN bus diagnosis Maintenance

Tutorial Maintenance Power Down MUT-3 Function Select Menu

Start-up the MUT-III system. Select "System Select".

System Check
POWERTRAIN UNDER CAR BODY

SRS-AIR BAG AUTO A/C

SWS ETACS

Meter Diplay

Select system

Select "SWS" from the "BODY" tab.

Pulse check SWS

BODY SWS Pulse check BODY SWS

Check Chart For Problem Self-diagnosis Simulated Vehicle Speed

Symptom Output
Simulated vehicle speed output

Pulse check

Data List Pulse Checking Actuator Test

L

Drive Recorder Special Function SWS MONITOR

H

For the pulse check, select Voltmeter Resistor

L
-10 0 "Pulse Checking".

Select function

For the SWS monitor, select

"SWS MONITOR".
SWS monitor
BODY SWS SWS monitor

SWS Ver. Destination

Item Value

SWS Ver. 1

SWS Destination NAS

SWS Ver. List

Item Information

Ver. 0 PASSENGER CAR

Ver. 1 MMMA PRODUCTS (GALANT, ECLIPSE)

Ver. 2 MINI CARS

Ver. 3

Check SWS version and destination and press "OK" button.

Confirm the SWS version and

destination.
To next page

AC207214 AB

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 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS
54B-11

From previous page

SWS monitor
BODY SWS SWS monitor

ECU COMM Check Data List

Function Diag. Drive Recorder

SWS Ver.:1/SWS Destination:NAS

For the ECU comm check, select For the data list, select For the function diagnosis, select
"ECU COMM Check". "Data List". "Function Diag".

SWS monitor SWS monitor SWS monitor

SWS SWS monitor FCU COMM Check SWS SWS monitor Data List SWS SWS monitor Function Diag.

The ECU which has been chosen The ECU which has been chosen
ECU List Function Diag. List
Info. No. Name Info. No. Name
Info. No. ECU Info. No. Function

80 COLUMN ECU
1 COLUM ECU 1 WIPER

83 ETACS ECU
2 ETACS 2 REAR WIPER

84 FRONT ECU
3 Front-ECU, P/W, S/R 3 LIGHTING

86 SUNROOF ECU

4 TURN SIGNAL

5 BUZZER

The number of item choices:4/4ECU, Group ECU COMM Check Select an ECU.Choose the Select Item button, when you set up the display items. Select Function.

Press the "OK" button. Select the ECU, and then press Select the desired item from
the "OK" button. "Function", and then press the
"OK" button.
SWS monitor SWS monitor SWS monitor
SWS SWS monitor ECU COMM Check SWS SWS monitor Data List SWS SWS monitor Function Diag.

ECU COMM Check Data List Reference Table

Detail Function Diag. List
Info. No. Name Value Graph Info. No. Name Value Graph
Info. No. Detail Function
ON
ON
80 COLUMN ECU OK
02 DIMMER SW OFF 1 F.WIPER INT
OFF
-120 -100 -80 -60 -40 -20 0 OFF
-120 -100 -80 -60 -40 -20 0
ON
ON
83 ETACS ECU OK 2 F.WIPER LO
OFF 09 FRONT WASH.SW OFF
-120 -100 -80 -60 -40 -20 0
OFF
ON -120 -100 -80 -60 -40 -20 0
3 F.WIPER HI
84 FRONT ECU OK ON
OFF
-120 -100 -80 -60 -40 -20 0 00 HEADLIGHT SW OFF
ON OFF 4 F.WIPER WASH
-120 -100 -80 -60 -40 -20 0
86 SUNROOF ECU OK
ON
OFF
-120 -100 -80 -60 -40 -20 0 HI WIPERSW 5 F.WIPER MIST
07 OFF
OFF
-120 -100 -80 -60 -40 -20 0
"OK":Operating, "NG":Not operating or not installed.

SWS Ver.:x/SWS Destinatino:NAS SWS Ver.:x/SWS Destinatino:NAS Select a detail function. Press Select Item button to set up the items.

Select the desired function from

"Detail Function", and then press
the "OK" button.
SWS monitor
SWS SWS monitor Function Diag.

WIPER/F.WIPER HI

Info. No. Name Value Graph

ON
FRONT WASH.SW
09 OFF
(COLUMN ECU)
OFF
-120 -100 -80 -60 -40 -20 0
ON
HI WIPERSW
07 OFF
(COLUMN ECU)
OFF
-120 -100 -80 -60 -40 -20 0
ON
INT WIPERSW
05 OFF
(COLUMN ECU)
OFF
-120 -100 -80 -60 -40 -20 0
ON
LO WIPERSW
06 OFF
(COLUMN ECU)
OFF
-120 -100 -80 -60 -40 -20 0

Highlighted No. doesn't meet operational requirements.

SWS Ver.:x/SWS Destinatino:NAS

AC207215 AB

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54B-12 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS

HOW TO CHECK ECUs

M1549014900606
1. Use the scan tool MB991958 (MUT-III Sub NOTE: The "ECU COMM CHK" function checks a
Assembly) and the SWS monitor kit to check communication status of ECUs "NG" does not
ECUs. (Refer to MUT-III Operating Instructions) always mean ECU malfunction. If a malfunction is
2. The following ECUs can be checked by using the found by the "ECU COMM CHK," proceed "Symptom
scan tool and the SWS monitor kit. Procedure" (Refer to P.54B-22).

SWS monitor kit-compatible ECUs and their conditions

ECUs TO BE CHECKED DISPLAY ON SCAN NORMAL ECU CONDITION

TOOL CONDITION
Column switch (column- COLUMN ECU OK*1 All of the column switch, power
ECU) supply, ground and interconnecting
communication line are normal
ETACS-ECU ETACS ECU OK All of the ETACS-ECU switch, power
supply, ground and interconnecting
communication line are normal
Front-ECU FRONT ECU OK*2 All of the front-ECU, power supply,
ground and interconnecting
communication line are normal
Sunroof motor assembly SUNROOF ECU OK*2 All of the sunroof motor assembly,
(sunroof-ECU) power supply, ground and
interconnecting communication line
are normal
RV meter CENTER DISP. OK*3 All of the RV meter, power supply,
ground and interconnecting
communication line are normal
Other SWS-related ECUs Other ECUs NG ECUs are not used
NOTE: . • *2: When "NG" is displayed beside the "ETACS
• *1: If the ignition switch is turned to the "LOCK" ECU," the scan tool shows "NG" beside the
(OFF) or "ACC" when "NG" is displayed beside "FRONT ECU" and "SUNROOF ECU."
the "ETACS ECU" or the signal request line is • *3: If "NG" is displayed beside the "COLUMN
abnormal, the scan tool shows "NG" beside the ECU," "NG" is displayed on the "CENTER DISP."
"COLUMN ECU."
SERVICE DATA CHECK
M1549015000662
1. Use the scan tool and the SWS monitor kit to 2. The following input signals can be checked by
check "Service Data." using the scan tool and the SWS monitor kit.
This "Service Data" check is applicable for NOTE: If a problem is found in the "Service Data"
signals, which are transmitted and received check, refer to the Problems during Input Signal
through the SWS communication line. For input Check <SWS monitor>. (Refer to P.54B-491.)
signals, which are not compatible with the SWS
monitor kit, refer to the Pulse Check procedure
(by using the scan tool or voltmeter) P.54B-21.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS
54B-13
<DATA LIST REFERENCE TABLE>
• COLUMN ECU (column switch)
CHECK ITEM DISPLAY ON CHECK CONDITION NORMAL
ITEM NO. SCAN TOOL CONDITION
Dimmer 02 DIMMER SW Dimmer switch: ON ON
switch Dimmer switch: OFF OFF
Windshield 09 FRONT Windshield washer switch: ON ON
washer WASH.SW Windshield washer switch: OFF OFF
switch
Headlight 16 H/L WASHER Headlight washer switch: ON ON
washer SW Headlight washer switch: OFF OFF
switch
Headlight 00 HEADLIGHT Lighting switch: HEAD ON
switch SW Lighting switch: Other than HEAD OFF
Windshield 07 HI WIPER SW Wiper switch: HI ON
high-speed Wiper switch: Other than HI OFF
wiper switch
With or 15 INT WIPE Vehicles with intermittent wiper adjusting EQUIP
without KNOB knob
windshield Vehicles without intermittent wiper adjusting NON
intermittent knob
wiper interval
adjusting
knob
Windshield 05 INT WIPER SW Wiper switch: INT ON
intermittent Wiper switch: Other than INT OFF
wiper switch
Windshield 06 LO WIPER SW Wiper switch: LO ON
low-speed Wiper switch: Other than LO OFF
wiper switch
Windshield 08 MIST WIPER Wiper switch: Mist ON
mist wiper SW Wiper switch: Other than "Mist" position OFF
switch
Passing light 03 PASSING SW Passing light switch: ON ON
switch Passing light switch: OFF OFF
Taillight 01 TAILLIGHT SW Lighting switch: TAIL ON
switch Lighting switch: OFF OFF
Turn-signal 11 T/S LH SW Turn-signal light switch: LH ON
light switch Turn-signal light switch: Other than LH OFF
(LH)
Turn-signal 10 T/S RH SW Turn-signal light switch: RH ON
light switch Turn-signal light switch: Other than RH OFF
(RH)
Rear wiper 13 REAR WIPER Rear wiper switch: INT ON
switch SW Rear wiper switch: Other than INT OFF
Rear washer 14 REAR Rear wiper switch: Washer ON
switch WASH.SW Rear wiper switch: Other than "Washer" OFF
position

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54B-14 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS

• ETACS ECU
CHECK ITEM DISPLAY ON CHECK CONDITION NORMAL
ITEM NO. SCAN TOOL CONDITION
BEEP DATA 60 beep data 1. Ignition switch: ACC or ON ON (2 kHz) (only
2. Carry out the audio preset operation. momentarily when
switch is operated)
Other than the condition above OFF
Tone alarm 43 BUZZER 1. Ignition switch: LOCK (OFF) ON
2. Key reminder switch: ON
3. Front door switch: ON (front door open)
When requirements for sounding each OFF
warning tone alarm are not satisfied
Front door 32 FRONT DOOR Front door switch (right or left): right or left ON
switch SW door switch is on (right or left front door is
open)
Front door switches (right and left): both OFF
right and left door switches are off (both
right and left front doors are closed)
Center 62 DISPLAY 1. Ignition switch: ACC or ON YES (only
display input SIGNAL 2. Carry out the audio preset operation. momentarily when
signal switch is operated)
Other than the condition above NO
Center 61 DISPLAY Ignition switch: LOCK (OFF) SLEEPING
display sleep SLEEP Ignition switch: ACC or ON OPERATING
status
Front door 32 FRONT DOOR Front door switch (right or left): right front ON
switch SW door or left front door switch is on (right or
left front door is open):
Front door switch (right or left): Both right OFF
and left door switches are off (both right and
left front doors are closed)
Front fog 36 F.FOG LIGHT 1. Lighting switch: HEAD or TAIL ON
lights 2. Fog light switch: ON
Other than the condition above OFF
Headlight 35 H/L AUTO-CUT 1. Lighting switch: Other than OFF OFF to ON (after
automatic 2. Ignition switch: from ON or START to approximately one
shutdown LOCK (OFF) or ACC second)
function 3. Front door switch: ON (front door open)
When requirements for the headlight OFF
automatic shutdown are not satisfied
Ignition 30 IG SW (IG1) Ignition switch: ON or START ON
switch (IG1) Ignition switch: LOCK (OFF) or ACC OFF
Ignition 31 IG SW (ACC) Ignition switch: ACC or ON ON
switch (ACC) Ignition switch: LOCK (OFF) or START OFF

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 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS
54B-15
CHECK ITEM DISPLAY ON CHECK CONDITION NORMAL
ITEM NO. SCAN TOOL CONDITION
Transmission 41 INHIBITOR SW Transmission range switch: R position ON
range switch Transmission range switch: Other than R OFF
("R" position) position
Windshield 37 INT WIPE 1. Ignition switch: ACC or ON The scan tool
intermittent TIME 2. Operate the intermittent wiper adjusting displays
wiper interval knob, and change the wiper interval intermittent wiper
interval in
response to the
intermittent wiper
adjusting knob
positions
Theft-alarm 45 THEFTALM. H/ Keyless entry transmitter panic button: ON ON
headlights L Keyless entry transmitter panic button: OFF OFF
NOTE: For item number 43, the scan tool also dis-
play "ON" when the light reminder tone alarm or R
(reverse) position warning tone alarm is triggered.
• FRONT ECU
CHECK ITEM DISPLAY ON CHECK CONDITION NORMAL
ITEM NO. SCAN TOOL CONDITION
Response by 70 FRONT ECU Lighting switch is at position other than OFF NORMAL ACK
the front- ACK (excluding when high-beam is on) or the
ECU wiper switch is at position other than OFF
• Ignition switch: ON or START SLEEP ACK
• Lighting switch: OFF
• Wiper switch: OFF
• Lighting switch: HEAD HI-BEAM ACK
• Headlight: High-beam
Except above conditions NO ACK
NOTE: For item number 70, the scan tool also dis-
plays "NG" under the "ECU COMM CHK" when it dis-
plays "NO ACK" under the front-ECU check.
• SUNROOF ECU (sunroof motor assembly)
CHECK ITEM DISPLAY ON CHECK CONDITION NORMAL
ITEM NO. SCAN TOOL CONDITION
Response by 72 S/R ECU ACK 1. Ignition switch: ON or START NORMAL ACK →
the sunroof- 2. While sunroof is off SLEEP ACK (after
ECU approximately 30
seconds)
1. Ignition switch: ON or START INPUT CHECK →
2. One of the sunroof switches is on NORMAL ACK
Except above conditions NO ACK
NOTE: For item number 72, the scan tool also dis-
plays "NG" under the "ECU COMM CHK" when it dis-
plays "No response" under the sunroof-ECU check.

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54B-16 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS

<FUNCTION DIAGNOSIS>
The table below shows the service data and their
normal condition, which are displayed during the
"FUNCTION DIAG." The row "Normal condition"
shows values, which are shown when each opera-
tion is made.
• WIPER
ITEM ITEM INPUT SIGNAL DISPLAY ON SCAN TOOL NORMAL CONDITION
NO.
F.WIPER HI 05 Windshield INT WIPER SW OFF
intermittent wiper
switch
06 Windshield low- LO WIPER SW OFF
speed wiper switch
07 Windshield high- HI WIPER SW ON
speed wiper switch
08 Windshield mist MIST WIPER SW OFF
wiper switch
09 Windshield washer FRONT WASH.SW OFF
switch
31 Ignition switch IG SW (ACC) ON
(ACC)
70 Response by the FRONT ECU ACK NORMAL ACK or HI-BEAM
front-ECU ACK
F.WIPER INT 05 Windshield INT WIPER SW ON
intermittent wiper
switch
06 Windshield low- LO WIPER SW OFF
speed wiper switch
07 Windshield high- HI WIPER SW OFF
speed wiper switch
08 Wind shield mist MIST WIPER SW OFF
wiper switch
09 Windshield washer FRONT WASH.SW OFF
switch
31 Ignition switch IG SW (ACC) ON
(ACC)
37 Windshield INT WIPE TIME The scan tool displays
intermittent wiper intermittent wiper interval in
interval response to the intermittent
wiper adjusting knob
positions
70 Response by the FRONT ECU ACK NORMAL ACK or HI-BEAM
front-ECU ACK

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 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS
54B-17
ITEM ITEM INPUT SIGNAL DISPLAY ON SCAN TOOL NORMAL CONDITION
NO.
F.WIPER LO 05 Windshield INT WIPER SW OFF
intermittent wiper
switch
06 Windshield low- LO WIPER SW ON
speed wiper switch
07 Windshield high- HI WIPER SW OFF
speed wiper switch
08 Wind shield mist MIST WIPER SW OFF
wiper switch
09 Windshield washer FRONT WASH.SW OFF
switch
31 Ignition switch IG SW (ACC) ON
(ACC)
70 Response by the FRONT ECU ACK NORMAL ACK or HI-BEAM
front-ECU ACK
F.WIPER MIST 05 Windshield INT WIPER SW OFF
intermittent wiper
switch
06 Windshield low- LO WIPER SW OFF
speed wiper switch
07 Windshield high- HI WIPER SW OFF
speed wiper switch
08 Wind shield mist MIST WIPER SW ON
wiper switch
09 Windshield washer FRONT WASH.SW OFF
switch
31 Ignition switch IG SW (ACC) ON
(ACC)
70 Response by the FRONT ECU ACK NORMAL ACK or HI-BEAM
front-ECU ACK
F.WIPER 08 Wind shield mist MIST WIPER SW OFF
WASH wiper switch
09 Windshield washer FRONT WASH.SW ON
switch
31 Ignition switch IG SW (ACC) ON
(ACC)
70 Response by the FRONT ECU ACK NORMAL ACK or HI-BEAM
front-ECU ACK

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54B-18 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS

• REAR WIPER
ITEM ITEM INPUT SIGNAL DISPLAY ON SCAN TOOL NORMAL CONDITION
NO.
REAR 14 Rear washer switch REAR WASH.SW ON
WASHER 31 Ignition switch IG SW (ACC) ON
(ACC)
REAR WIPER 13 Rear wiper switch REAR WIPER SW ON
14 Rear washer switch REAR WASH.SW OFF
31 Ignition switch IG SW (ACC) ON
(ACC)
REV.INTERLO 13 Rear wiper switch REAR WIPER SW ON
CK 31 Ignition switch IG SW (ACC) ON
(ACC)
41 Transmission PNP SW (R) ON
range switch ("R"
position)
• LIGHTING
ITEM ITEM INPUT SIGNAL DISPLAY ON SCAN TOOL NORMAL CONDITION
NO.
H/L AUTO-CUT 00 Headlight switch HEADLIGHT SW Either is on
01 Taillight switch TAILLIGHT SW
30 Ignition switch IG SW (IG1) OFF
(IG1)
32 Front door switch FRONT DOOR SW ON
35 Headlight H/L AUTO-CUT ON
automatic
shutdown function
70 Response by the FRONT ECU ACK NORMAL ACK or HI-BEAM
front-ECU ACK
OFF 00 Headlight switch HEADLIGHT SW OFF
01 Taillight switch TAILLIGHT SW OFF
03 Passing light switch PASSING SW OFF
04 Automatic lighting AUTOLAMP SW OFF
switch
30 Ignition switch IG SW (IG1) ON
(IG1)
35 Headlight H/L AUTO-CUT OFF
automatic
shutdown function
70 Response by the FRONT ECU ACK NORMAL ACK or SLEEP
front-ECU ACK

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 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS
54B-19
ITEM ITEM INPUT SIGNAL DISPLAY ON SCAN TOOL NORMAL CONDITION
NO.
HEADLIGHT HI 00 Headlight switch HEADLIGHT SW ON
02 Dimmer switch DIMMER SW ON
03 Passing light switch PASSING SW ON
30 Ignition switch IG SW (IG1) ON
(IG1)
35 Headlight H/L AUTO-CUT OFF
automatic
shutdown function
70 Response by the FRONT ECU ACK HI-BEAM ACK
front-ECU
HEADLIGHT 00 Headlight switch HEADLIGHT SW ON
LO 03 Passing light switch PASSING SW OFF
30 Ignition switch IG SW (IG1) ON
(IG1)
35 Headlight H/L AUTO-CUT OFF
automatic
shutdown function
70 Response by the FRONT ECU ACK NORMAL ACK
front-ECU
PASSING 03 Passing light switch PASSING SW ON
LIGHT 70 Response by the FRONT ECU ACK NORMAL ACK or HI-BEAM
front-ECU ACK
TAILLIGHT 00 Headlight switch HEADLIGHT SW OFF
01 Taillight switch TAILLIGHT SW ON
03 Passing light switch PASSING SW OFF
30 Ignition switch IG SW (IG1) ON
(IG1)
35 Headlight H/L AUTO-CUT OFF
automatic
shutdown function
70 Response by the FRONT ECU ACK NORMAL ACK
front-ECU
NOTE: When checking the input signals (off, tail, For checking item "HI (High-beam)," the scan tool
low-beam or high-beam), turn the ignition switch to displays "OFF" on the item No.2 "Dimmer SW" when
the "ON" position in order to disable the headlight the headlights are at high-beam. Therefore, the scan
automatic shutdown function. However, the headlight tool should display "ON" momentarily when the dim-
operation does not depend on the ignition switch mer switch is operated.
positions, the scan tool does not display the title
"IGNITION SWITCH."

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54B-20 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS

• TURN SIGNAL
ITEM ITEM INPUT SIGNAL DISPLAY ON SCAN TOOL NORMAL CONDITION
NO.
TURN-SIG.LH 10 Turn-signal light T/S RH SW OFF
switch (RH)
11 Turn-signal light T/S LH SW ON
switch (LH)
30 Ignition switch IG SW (IG1) ON
(IG1)
TURN-SIG.RH 10 Turn-signal light T/S RH SW ON
switch (RH)
11 Turn-signal light T/S LH SW OFF
switch (LH)
30 Ignition switch IG SW (IG1) ON
(IG1)
• BUZZER
ITEM ITEM INPUT SIGNAL DISPLAY ON SCAN TOOL NORMAL CONDITION
NO.
CENTR.DIS.AL 43 Tone alarm BUZZER ON
M 60 BEEP DATA beep data ON (2 kHz) (only
momentarily when switch is
operated)
KEY 30 Ignition switch IG SW (IG1) OFF
REMND.ALM (IG1)
32 Front door switch FRONT DOOR SW ON
43 Tone alarm BUZZER ON
LGT 00 Headlight switch HEADLIGHT SW Either is on
MONI.ALM 01 Taillight switch TAILLIGHT SW
30 Ignition switch IG SW (IG1) OFF
(IG1)
32 Front door switch FRONT DOOR SW ON
35 Headlight H/L AUTO-CUT OFF
automatic
shutdown function
43 Tone alarm BUZZER ON
OTHER 30 Ignition switch IG SW (IG1) ON
ALARM (IG1)
43 Tone alarm BUZZER ON
NOTE: The headlight automatic shutdown function
works in approximately one second after the lighting
monitor tone alarm starts sounding, and then the
tone alarm ceases sounding.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SWS DIAGNOSIS
54B-21
• SUNROOF
ITEM ITEM INPUT SIGNAL DISPLAY ON SCAN TOOL NORMAL CONDITION
NO.
SUNROOF 30 Ignition switch IG SW (IG1) ON
OPE. (IG1)
72 Response by the S/R ECU ACK INPUT CHECK (only
sunroof-ECU momentarily when switch is
operated)
• THEFT-ALARM
ITEM ITEM INPUT SIGNAL DISPLAY ON SCAN TOOL NORMAL CONDITION
NO.
THEFT-ALARM 45 Theft-alarm THEFTALM. H/L ON
headlight
70 Response by the FRONT ECU ACK NORMAL ACK
front-ECU

PULSE CHECK
M1549015100528
1. The input signals (signals other than SWS 2. Use the scan tool or voltmeter to check the
communication line signals), which are following input signals.
compatible with the SWS monitor by using the NOTE: If a problem is found the Pulse Check,
scan tool or voltmeter, can be confirmed by the proceed to the Problems during Input Signal
Pulse Check. Check <Scan tool or voltmeter> (Refer to P.54B-
491).
Switches and their conditions, which are applicable
for Pulse Check
INPUT SIGNAL REQUIREMENT FOR SOUNDING
TONE ALARM
Key reminder switch When the inserted ignition key is pulled
out
Hazard light switch When the switch is turned from off to on
Seat belt which When the seat belt is fastened
All door switches (excluding front door switch) Either of the doors (excluding front door)
is opened
Driver's, front passenger's or back door lock key cylinder switch When the key cylinder is locked or
unlocked
Driver's, front passenger's, rear or back door lock actuator When the driver's key cylinder or inside
lock knob is unlocked or locked
Door lock switch (incorporated in the power window main When a door is locked or unlocked by a
switch) door lock switch
Hood switch When the hood is opened
Keyless entry system transmitter Switches When the switch is turned from off to on

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54B-22 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM CHART

SYMPTOM CHART
M1549000801104
<ECU communication system>
SYMPTOM INSPECTION REFERENCE
PROCEDURE PAGE
Communication with the SWS monitor kit is not possible. A-1 P.54B-27
Communication with the column switch (column-ECU) is not possible. A-2 P.54B-34
Communication with the ETACS-ECU is not possible. A-3 P.54B-41
Communication with the front-ECU is not possible. A-4 P.54B-48
Communication with the sunroof motor assembly (sunroof-ECU) is not A-5 P.54B-55
possible.
Communication with the RV meter is not possible. A-6 P.54B-67
<Function system>
SYSTEM SYMPTOM INSPECTION REFERENCE
PROCEDURE PAGE
Tone alarm General description concerning the tone − P.54B-70
alarm function
Ignition key reminder tone alarm function B-1 P.54B-75
does not work normally.
Light reminder tone alarm function does B-2 P.54B-79
not work normally.
Seat belt tone alarm function does not B-3 P.54B-82
work normally.
RV meter operating sound function does B-4 P.54B-85
not work normally.
Central door locking General description concerning the central − P.54B-87
system door locking system
Central door lock system does not work at C-1 P.54B-92
all.
Some doors do not lock or unlock. C-2 P.54B-100
All the doors do not lock or unlock with just C-3 P.54B-127
the door lock switch operation.
All the doors do not lock or unlock with just C-4 P.54B-129
the door lock key cylinder key operation.
All the doors do not lock with just the C-5 P.54B-131
driver's inside lock knob operation.
Forgotten key prevention function does not C-6 P.54B-133
work normally.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM CHART
54B-23
SYSTEM SYMPTOM INSPECTION REFERENCE
PROCEDURE PAGE
Power windows General description concerning the power − P.54B-137
windows function
Power windows do not work at all. D-1 P.54B-141
The power window timer function does not D-2 P.54B-151
work normally.
Only the front power window (LH) does D-3 P.54B-154
work normally by operating the power
window main switch.
Power windows do not work normally by D-4 P.54B-157
operating the front passenger’s and rear
power window sub-switches.
Front passenger’s and rear power windows D-5 P.54B-190
do not work normally by operating the
power window main switch.
Keyless entry system General description concerning keyless − P.54B-192
entry system
Keyless entry system does not operate. E-1 P.54B-197
The dome light, hazard warning lights E-2 P.54B-199
(turn-signal lights) and horn do not operate
through the answerback function.
Encrypted code cannot be registered. E-3 P.54B-200
Sunroof General description concerning the sunroof − P.54B-202
Sunroof does not operate. F-1 P.54B-204
Any of the sunroof switch positions is F-2 P.54B-213
defective.
Sunroof timer function does not work F-3 P.54B-215
normally.
Safety mechanism does not function. F-4 P.54B-217

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54B-24 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM CHART

SYSTEM SYMPTOM INSPECTION REFERENCE

PROCEDURE PAGE
Windshield wiper and General description concerning the − P.54B-218
washer windshield wiper and washer function
The windshield wipers do not work at all. G-1 P.54B-222
The windshield wipers do not work when G-2 P.54B-231
the windshield wiper switch is at "INT" or
"MIST" position or the windshield washer
switch is at "ON" position. However, the
wipers work at low speed when the
windshield wiper switch is at "LO" or "HI."
The windshield wipers do not work G-3 P.54B-233
normally.
The windshield wipers do not stop at the G-4 P.54B-239
specified park position.
The windshield intermittent wiper interval is G-5 P.54B-245
not changed by operating the windshield
intermittent wiper interval adjusting knob or
according to the vehicle speed.
The windshield washer does not work. G-6 P.54B-247
Rear wiper and washer General description concerning the rear − P.54B-253
wiper and washer function
Rear wiper does not work at all. H-1 P.54B-256
Rear wiper does not stop at the H-2 P.54B-264
predetermined park position.
When the selector lever is moved to "R" H-3 P.54B-266
position during the rear wiper operation,
the rear wiper does not operate at the
continuous mode.
Rear washer does not work. H-4 P.54B-269
Seat belt warning light General description concerning the seat − P.54B-274
belt warning light function
The seat belt warning light does not I-1 P.54B-276
illuminate.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM CHART
54B-25
SYSTEM SYMPTOM INSPECTION REFERENCE
PROCEDURE PAGE
Headlight and taillight General description concerning headlight − P.54B-284
and taillight function
The taillights do not illuminate. J-1 P.54B-289
Headlights (low-beam) do not illuminate. J-2 P.54B-294
Headlights (high-beam) do not illuminate. J-3 P.54B-299
Headlights do not illuminate when the J-4 P.54B-303
passing switch is operated.
Headlights do not illuminate when the J-5 P.54B-305
lighting switch is at "TAIL," and "PASSING"
position, but illuminate at low-beam when
the switch is at "HEAD" position. At this
position, the headlights cannot be changed
into high beam by operating the dimmer
switch.
Any of taillights, the position lights, the side J-6 P.54B-307
marker lights or license plate lights does
not illuminate.
One of the headlights does not illuminate. J-7 P.54B-337
The high-beam indicator light does not J-8 P.54B-348
Illuminate.
Headlight automatic shutdown function J-9 P.54B-354
does not work normally.
Headlight dimmer switch automatic J-10 P.54B-356
resetting function does not work normally.
Daytime running light function does not J-11 P.54B-357
work normally. <vehicles for Canada>
Flasher timer General description concerning the flasher − P.54B-360
timer function
Turn-signal lights do not flash when the K-1 P.54B-363
turn signal light switch is operated.
Hazard warning lights do not illuminate. K-2 P.54B-370
One of the turn-signal lights do not K-3 P.54B-372
illuminate.
Fog light General description concerning the fog − P.54B-393
light function
Fog lights do not illuminate when the fog L-1 P.54B-395
light switch is operated.
Fog lights do not go out when the L-2 P.54B-402
headlights (low-beam) are turned off while
the fog lights are on.
One of the fog lights does not illuminate. L-3 P.54B-403

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54B-26 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM CHART

SYSTEM SYMPTOM INSPECTION REFERENCE

PROCEDURE PAGE
Interior light General description concerning the interior − P.54B-416
light function
The dome light do not illuminate or go out M-1 P.54B-419
normally.
Dome light dimming function does not work M-2 P.54B-449
normally.
The ignition key hole illumination light does M-3 P.54B-453
not illuminate or go out normally.
Theft-alarm system General description concerning the theft- − P.54B-462
alarm system
Theft-alarm system is not armed (theft- N-1 P.54B-465
alarm indicator light does not illuminate).
Horn does not sound when the theft-alarm N-2 P.54B-474
system is triggered.
Headlights (high-beam) do not flash when N-3 P.54B-488
the theft-alarm system is triggered.
Panic alarm function does not work. N-4 P.54B-489

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-27
SYMPTOM PROCEDURES

INSPECTION PROCEDURE A-1: Communication with the SWS monitor kit is not possible.

Scan Tool Communication and ETACS-ECU Ground Circuit

JUNCTION
BLOCK

ETACS-
ECU

JUNCTION
BLOCK

DATA LINK DATA LINK

CONNECTOR CONNECTOR
FRONT SIDE FRONT SIDE

CONNECTORS : D-117, D-118

CONNECTORS : D-209, D-220

D-208

D-118(B)
D-117 D-220
AC400706 AI AC204173 AT

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54B-28 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTORS : D-222, D-224

D-222

D-224(B)
AC204174 AH

• The SWS monitor harness may be defective

.

TECHNICAL DESCRIPTION (COMMENT)

The SWS monitor kit may be connected improperly. • The ETACS-ECU may be defective
• The wiring harness or connectors may have
.
loose, corroded, or damaged terminals, or termi-
TROUBLESHOOTING HINTS nals pushed back in the connector
• The SWS monitor body (I/F cartridge) may be
defective
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B

STEP 1. Verify SWS monitor kit MB991862 for proper

connection.
Q: Is SWS monitor kit MB991862 connected with the
column switch properly?
YES : Go to Step 2.
NO : Connect SWS monitor kit MB991862 to the column
switch securely.

STEP 2. Verify the power supply circuit to the ETACS-ECU.

Q: Does the system communicate with scan tool
MB991502 when the ignition switch is turned to the
"ON" position?
YES : Go to Step 3.
NO : Refer to Inspection Procedure A-3 "Communication
with the ETACS-ECU is not possible P.54B-41."

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-29

STEP 3. Check ETACS-ECU connector D-222 and D-224 for

loose, corroded or damaged terminals, or terminals
pushed back in the connector.
CONNECTORS : D-222, D-224
Q: Are ETACS-ECU connector D-222 and D-224 in good
condition?
YES : Go to Step 4.
NO : Repair or replace the damaged component(s). Refer
D-222
to GROUP 00E, Harness Connector Inspection
P.00E-2. The system should communicate with the
SWS monitor normally.

D-224(B)

JUNCTION BLOCK SIDE

D-222

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

HARNESS SIDE
D-224(B)

3029 28 27 26 25 24 23 22 21
40 39 38 37 36 35 3433 32 31

AC204192 AC

STEP 4. Check the ground circuit to the ETACS-ECU. Test

at ETACS-ECU connector D-222 and D-224.
CONNECTORS : D-222, D-224
(1) Disconnect ETACS-ECU connector D-222 and D-224, and
measure the resistance available at the junction block side
of the connector.
D-222

D-224(B)

JUNCTION BLOCK SIDE

D-222

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

HARNESS SIDE
D-224(B)

3029 28 27 26 25 24 23 22 21
40 39 38 37 36 35 3433 32 31

AC204192 AC

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54B-30 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

(2) Measure the resistance value between ETACS-ECU

connector D-222 terminal 20 and ground, and also between
ETACS-ECU connector D-224 terminal 23 and ground.
CONNECTOR D-222
• The resistance should equal 2 ohms or less.
(JUNCTION BLOCK SIDE) Q: Is the measured resistance 2 ohms or less?
20 19 18171615 141312 1110 9 8 7 6 5 4 3 2 1 YES : Go to Step 6.
NO : Go to Step 5.

ACX01569 AB

CONNECTOR D-224
(HARNESS SIDE)

3029 28 27 26 25 24 23 22 21
40 39 38 37 36 35 3433 32 31
AC204759 AB

STEP 5. Check the wiring harness between ETACS-ECU

connector D-222 (terminal 20) or D-224 (terminal 23) and
the ground.
CONNECTORS : D-222, D-224

D-222

D-224(B)

JUNCTION BLOCK SIDE

D-222

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

HARNESS SIDE
D-224(B)

3029 28 27 26 25 24 23 22 21
40 39 38 37 36 35 3433 32 31

AC204192 AC

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-31
NOTE: Also check junction block connector D-209 for loose,
CONNECTOR : D-209
corroded, or damaged terminals, or terminals pushed back in
the connector. If junction block connector D-209 is damaged,
repair or replace the damaged component(s) as described in
GROUP 00E, Harness Connector Inspection P.00E-2.
Q: Is the wiring harness between ETACS-ECU connector D-
HARNESS SIDE 222 (terminal 20) or D-224 (terminal 23) and the ground
in good condition?
YES : No action is necessary and testing is complete.
AC204173 BW NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the SWS monitor kit
normally.

STEP 6. Check data link connector D-118 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
CONNECTOR : D-118 Q: Is and data link connector D-118 in good condition?
YES : Go to Step 7.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2.The system should communicate with the
SWS monitor kit normally.

HARNESS SIDE D-118(B)

AC400706 BK

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54B-32 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 7. Check the wiring harness between ETACS-ECU

connector D-224 (terminals 22 and 37) and data link
connector D-118 (terminals 1 and 9).
CONNECTOR : D-118

HARNESS SIDE D-118(B)

AC400706 BK

CONNECTOR : D-224

HARNESS SIDE

3029 28 27 26 25 24 23 22 21
D-224(B) 40 39 38 37 36 35 3433 32 31
AC204174 AL

NOTE: Also check junction block connector D-220 for loose,

CONNECTOR : D-220
corroded, or damaged terminals, or terminals pushed back in
the connector. If junction block connector D-220 is damaged,
repair or replace the damaged component(s) as described in
GROUP 00E, Harness Connector Inspection P.00E-2.
HARNESS SIDE Q: Is the wiring harness between ETACS-ECU connector D-
224 (terminals 22 and 37) and data link connector D-118
5 4 3 2 1
10 9 8 7 6 (terminals 1 and 9) in good condition?
YES : Go to Step 8.
AC204173 AI NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the SWS monitor kit
normally.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-33

STEP 8. Check data link connector D-117 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
CONNECTOR : D-117 Q: Is data link connector D-117 in good condition?
YES : Go to Step 9.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. The system should communicate with the
SWS monitor kit normally.
HARNESS SIDE

AC400706 AO

STEP 9. Check the wiring harness between ETACS-ECU

connector D-224 (terminal 21) and data link connector D-
117 (terminal 31).
CONNECTOR : D-117 Q: Is the wiring harness between ETACS-ECU connector D-
224 (terminal 21) and data link connector D-117
(terminal 31) in good condition?
YES : Replace the ETACS-ECU. The system should
communicate with the SWS monitor kit normally.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
HARNESS SIDE
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
AC400706 AO should communicate with the SWS monitor kit
normally.
CONNECTOR : D-224

HARNESS SIDE

3029 28 27 26 25 24 23 22 21
D-224(B) 40 39 38 37 36 35 3433 32 31
AC204174 AL

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54B-34 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

INSPECTION PROCEDURE A-2: Communication with the column switch (column-ECU) is not
possible.

NOTE: This troubleshooting procedure requires the

use of scan tool MB991958 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor P.54B-10."
Column Switch Power Supply and SWS Communication Circuit

FUSIBLE IGNITION
LINK 1 SWITCH (IG1)

RELAY
BOX
JUNCTION
BLOCK

COLUMN
SWITCH
COLUMN-ECU

DATA LINK JUNCTION

CONNECTOR BLOCK
ETACS-
FRONT SIDE ECU

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-35
CONNECTOR : D-28 CONNECTOR : D-203

AC400706AJ AC204172 AG

CONNECTOR : D-224

D-224(B)
AC204174 AG

TECHNICAL DESCRIPTION (COMMENT)

.

CIRCUIT OPERATION
• The power supply to the column switch is pro- The power supply circuit to the column switch (col-
vided by the battery and the ignition switch (IG1). umn-ECU) may be defective. If the battery power
• If the power supply system from the battery is supply circuit (terminal 1 of the column switch) to the
defective, the system operates by the power sup- ECU is damaged, also check the power supply circuit
ply from the ignition switch (IG1). from the ignition switch (IG1) (terminal 9 of the col-
umn switch), and repair if necessary.
.

TROUBLESHOOTING HINTS
• The ETACS-ECU may be defective
• The column switch may be defective
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

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54B-36 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
• MB991854: SWS Monitor Harness (For 13-pin)

STEP 1. Use scan tool MB991958 to select "ECU COMM

CHK" on the SWS monitor display.
Check the following ECUs:
• ETACS-ECU
• Column-ECU
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
DATA LINK DATA LINK (1) Connect the special tool. Refer to "How to connect SWS
CONNECTOR CONNECTOR monitor P.54B-7.
(13-PIN) (16-PIN)
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate scan tool MB991958 according to the procedure
below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
MB991911 3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."
MB991806 (4) Scan tool MB991958 should show "OK" on the "ECU
MB991862
COMM CHK" menus for both the "ETACS ECU" and the
MB991824 "COLUMN ECU" menus.
Q: Is "OK" displayed on both the "ETACS ECU" and
"COLUMN ECU" menus?
"OK" are displayed for all the items : Go to Step 2.
"NG" is displayed on the "COLUMN ECU" menu : Go to
Step 2.
"NG" is displayed on the "ETACS ECU" menu : Refer to
MB991827 AC309091AB
Inspection Procedure A-3 "Communication with
ETACS-ECU is not possible P.54B-41."
"NG" are displayed for all the items : Refer to Inspection
Procedure A-3 "Communication with ETACS-ECU is
not possible P.54B-41."

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-37

STEP 2. Check column switch connector D-203 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is column switch connector D-203 in good condition?
CONNECTOR : D-203
HARNESS SIDE YES : Go to Step 3.
5 4 3 2 1 NO : Repair or replace the damaged component(s). The
10 9 8 7 6
system should communicate with the column switch
(column-ECU) normally.

AC204172 AM

STEP 3. Check the battery power supply circuit to the

column switch. Test at column switch connector D-203.
(1) Disconnect column switch connector D-203 and measure
CONNECTOR : D-203
HARNESS SIDE the voltage available at the wiring harness side of the
5 4 3 2 1 connector.
10 9 8 7 6

AC204172 AM

(2) Measure the voltage between terminal 1 and ground by

backprobing.
• The voltage should be approximately 12 volts (battery
CONNECTOR D-203
(HARNESS SIDE)
positive voltage).
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Go to Step 5.
5 4 3 2 1
10 9 8 7 6
NO : Go to Step 4.

AC203693 AC

STEP 4. Check the wiring harness between column switch

connector D-203 (terminal 1) and the battery.
CONNECTOR : D-203
HARNESS SIDE
5 4 3 2 1
10 9 8 7 6

AC204172 AM

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54B-38 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTOR : D-28 NOTE: Also check intermediate connector D-28 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector D-28 is damaged, repair or
replace the damaged component(s) as described in GROUP
00E, Harness Connector Inspection P.00E-2.
Q: Is the wiring harness between column switch connector
D-203 (terminal 1) and the battery in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
AC400706AF connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the column switch (column-
ECU) normally.

STEP 5. Check the ground circuit to the column switch.

Test at column switch connector D-203.
(1) Disconnect column switch connector D-203 and measure
CONNECTOR : D-203
HARNESS SIDE the resistance available at the wiring harness side of the
5 4 3 2 1 connector.
10 9 8 7 6

AC204172 AM

(2) Measure the resistance value between terminal 4 and

ground.
• The resistance should equal 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
CONNECTOR D-203
(HARNESS SIDE) YES : Go to Step 7.
NO : Go to Step 6.

5 4 3 2 1
10 9 8 7 6
ACX00772 AB

STEP 6. Check the wiring harness between column switch

connector D-203 (terminal 4) and the ground.
Q: Is the wiring harness between column switch connector
CONNECTOR : D-203
HARNESS SIDE D-203 (terminal 4) and the ground in good condition?
5 4 3 2 1 YES : No action is necessary and testing is complete.
10 9 8 7 6
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the column switch (column-
ECU) normally.
AC204172 AM

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-39

STEP 7. Check ETACS-ECU connector D-224 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector D-224 in good condition?
CONNECTOR : D-224
YES : Go to Step 8.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. The system should communicate with the
column switch (column-ECU) normally.
HARNESS SIDE

3029 28 27 26 25 24 23 22 21
D-224(B) 40 39 38 37 36 35 3433 32 31
AC204174 AL

STEP 8. Check the wiring harness between column switch

connector D-203 (terminal 3) and ETACS-ECU connector D-
224 (terminal 21).
Q: Is the wiring harness between column switch connector
CONNECTOR : D-203
HARNESS SIDE D-203 (terminal 3) and ETACS-ECU connector D-224
5 4 3 2 1 (terminal 21) in good condition?
10 9 8 7 6
YES : Go to Step 9.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the column switch (column-
AC204172 AM
ECU) normally.

CONNECTOR : D-224

HARNESS SIDE

3029 28 27 26 25 24 23 22 21
D-224(B) 40 39 38 37 36 35 3433 32 31
AC204174 AL

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54B-40 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 9. Check the wiring harness between column switch

connector D-203 (terminal 2) and ETACS-ECU connector D-
224 (terminal 31).
Q: Is the wiring harness between column switch connector
CONNECTOR : D-203
HARNESS SIDE D-203 (terminal 2) and ETACS-ECU connector D-224
5 4 3 2 1 (terminal 31) in good condition?
10 9 8 7 6
YES : Go to Step 10.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the column switch (column-
AC204172 AM
ECU) normally.

CONNECTOR : D-224

HARNESS SIDE

3029 28 27 26 25 24 23 22 21
D-224(B) 40 39 38 37 36 35 3433 32 31
AC204174 AL

STEP 10. Replace the ECU.

(1) Replace the column switch.
(2) The system should communicate with the column switch
(column-ECU) normally.
Q: Can the system communicate with the column switch
(column-ECU)?
YES : No action is necessary and testing is complete.
NO : Replace the ETACS-ECU. The system should
communicate with the column switch (column-ECU)
normally.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-41

INSPECTION PROCEDURE A-3: Communication with the ETACS-ECU is not possible.

ETACS-ECU Power Supply and SWS Communication Circuit

FUSIBLE IGNITION
LINK 1 SWITCH (IG1)

RELAY
BOX

JUNCTION
BLOCK

ETACS-
ECU

POWER
SOURCE

DATA LINK COLUMN

CONNECTOR SWITCH
COLUMN-ECU
FRONT SIDE

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54B-42 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTOR : D-28 CONNECTOR : D-203

AC400706AJ AC204172 AG

CONNECTORS : D-209, 221 CONNECTORS : D-222, D-224

D-209

D-222
D-221
D-224(B)
AC204173 AL AC204174 AH

ECU) is damaged, also check the power supply cir-

.

CIRCUIT OPERATION
• The power supply to the ETACS-ECU is provided cuit from the ignition switch (IG1) (terminal 16 of the
by the battery and the ignition switch (IG1). ETACS-ECU), and repair if necessary. If the ground
• If the power supply system from the battery is circuit to the ECU (terminal 20 of the ETACS-ECU) is
defective, the system operates by the power sup- damaged, also check the ground circuit to the sensor
ply from the ignition switch (IG1). (terminal 23 of the ETACS-ECU), and repair if neces-
sary.
.

TECHNICAL DESCRIPTION (COMMENT) .

It is suspected that the power supply circuit to the TROUBLESHOOTING HINTS

ETACS-ECU is defective, or the wiring harness • The ETACS-ECU may be defective
between the SWS monitor kit and the ETACS-ECU • The wiring harness or connectors may have
or their connector(s) is damaged. If the battery power loose, corroded, or damaged terminals, or termi-
supply circuit to the ECU (terminal 6 of the ETACS- nals pushed back in the connector

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-43
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B

STEP 1. Check ETACS-ECU connector D-222 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector D-222 in good condition?
CONNECTOR : D-222
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. The system should communicate with the
ETACS-ECU normally.

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

STEP 2. Check the battery power supply circuit to the

ETACS-ECU. Test at ETACS-ECU connector D-222.
(1) Disconnect ETACS-ECU connector D-222 and measure the
CONNECTOR : D-222
voltage available at the junction block side of the connector.

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

(2) Measure the voltage between terminal 6 and ground.

• The voltage should be approximately 12 volts (battery
positive voltage).
CONNECTOR D-222 Q: Is the measured voltage approximately 12 volts (battery
(JUNCTION BLOCK SIDE) positive voltage)?
20 19 18171615 141312 1110 9 8 7 6 5 4 3 2 1 YES : Go to Step 4.
NO : Go to Step 3.

ACX01610 AB

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54B-44 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 3. Check the wiring harness between ETACS-ECU

connector D-222 (terminal 6) and the battery.
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR : D-28 NOTE: Also check intermediate connector D-28 and junction
block connector D-221 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If intermediate
connector D-28 or junction block connector D-221 is damaged,
repair or replace the damaged component(s) as described in
GROUP 00E, Harness Connector Inspection P.00E-2.
Q: Is the wiring harness between ETACS-ECU connector D-
222 (terminal 6) and the battery in good condition?
YES : No action is necessary and testing is complete.
AC400706AF NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
CONNECTOR : D-221 terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the ETACS-ECU normally.

HARNESS SIDE
2 1
8 7 6 5 4 3

AC204173 AJ

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-45

STEP 4. Check the ground circuit to the ETACS-ECU. Test

at ETACS-ECU connector D-222.
(1) Disconnect ETACS-ECU connector D-222 and measure the
CONNECTOR : D-222
resistance available at the junction block side of the
connector.

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

(2) Measure the resistance value between terminal 20 and

ground.
• The resistance should equal 2 ohms or less.
CONNECTOR D-222 Q: Is the measured resistance 2 ohms or less?
(JUNCTION BLOCK SIDE) YES : Go to Step 7.
20 19 18171615 141312 1110 9 8 7 6 5 4 3 2 1 NO : Go to Step 5.

ACX01569 AB

STEP 5. Check ETACS-ECU D-224 for loose, corroded or

damaged terminals, or terminals pushed back in the
connector.
Q: Is ETACS-ECU connectors D-224 in good condition?
CONNECTOR : D-224
YES : Go to Step 6.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. The system should communicate with the
ETACS-ECU normally.
HARNESS SIDE

3029 28 27 26 25 24 23 22 21
D-224(B) 40 39 38 37 36 35 3433 32 31
AC204174 AL

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54B-46 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 6. Check the wiring harness between ETACS-ECU

connector D-222 (terminal 20) and C-224 (terminal 23) and
the ground.
CONNECTORS : D-222, D-224

D-222

D-224(B)

JUNCTION BLOCK SIDE

D-222

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

HARNESS SIDE
D-224(B)

3029 28 27 26 25 24 23 22 21
40 39 38 37 36 35 3433 32 31

AC204192 AC

NOTE: Also check junction block connector D-209 for loose,

CONNECTOR : D-209
corroded, or damaged terminals, or terminals pushed back in
the connector. If junction block connector D-209 is damaged,
repair or replace the damaged component(s) as described in
GROUP 00E, Harness Connector Inspection P.00E-2.
Q: Is the wiring harness between ETACS-ECU connector D-
HARNESS SIDE 222 (terminal 20) and D-224 (terminal 23) and the ground
in good condition?
YES : No action is necessary and testing is complete.
AC204173 BW NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the ETACS-ECU normally.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-47

STEP 7. Check column switch connector D-203 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is column switch connector D-203 in good condition?
CONNECTOR : D-203
HARNESS SIDE YES : Go to Step 8.
5 4 3 2 1 NO : Repair or replace the damaged component(s). Refer
10 9 8 7 6
to GROUP 00E, Harness Connector Inspection
P.00E-2. The system should communicate with the
ETACS-ECU normally.

AC204172 AM

STEP 8. Check the wiring harness between column switch

connector D-203 (terminals 2 and 3) and ETACS-ECU
connector D-224 (terminals 31 and 21).
Q: Is the wiring harness between column switch connector
CONNECTOR : D-203
HARNESS SIDE D-203 (terminals 2 and 3) and ETACS-ECU connector D-
5 4 3 2 1 224 (terminals 31 and 21) in good condition?
10 9 8 7 6
YES : Replace the ETACS-ECU. The system should
communicate with the ETACS-ECU normally.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
AC204172 AM
should communicate with the ETACS-ECU normally.

CONNECTOR : D-224

HARNESS SIDE

3029 28 27 26 25 24 23 22 21
D-224(B) 40 39 38 37 36 35 3433 32 31
AC204174 AL

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54B-48 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

INSPECTION PROCEDURE A-4: Communication with the front-ECU is not possible.

NOTE: This troubleshooting procedure requires the

use of scan tool MB991958 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitorP.54B-10."
Front-ECU Power Supply and SWS Communication Circuit

FUSIBLE IGNITION
LINK 1 SWITCH (IG2)

RELAY JUNCTION
BOX BLOCK

FRONT-
ECU

POWER
SOURCE

DATA LINK JUNCTION

CONNECTOR BLOCK
ETACS-
FRONT SIDE
ECU

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-49

CONNECTORS : A-07X, A-08X CONNECTOR : D-28

A-08X
A-07X

AC204183 AI AC400706AJ

CONNECTOR : D-224

D-224(B)
AC204174 AG

TECHNICAL DESCRIPTION (COMMENT)

.

CIRCUIT OPERATION
• The power supply to the front-ECU is provided by It is suspected that the power supply circuit to the
the battery and the ignition switch (IG2). front-ECU is defective, or the wiring harness
• If the power supply system from the battery is between the SWS monitor kit and the front-ECU or
defective, the system operates by the power sup- their connector(s) is damaged. If the battery power
ply from the ignition switch (IG2). supply circuit to the ECU (terminal 7 of the front-
ECU) is damaged, also check the power supply cir-
.
cuit from the ignition switch (IG2) (terminal 30 of the
front-ECU), and repair if necessary.
.

TROUBLESHOOTING HINTS
• The ETACS-ECU may be defective
• The front-ECU may be defective
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

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54B-50 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
• MB991854: SWS Monitor Harness (For 13-pin)

STEP 1. Use scan tool MB991958 to select "ECU COMM

CHK" on the SWS monitor display.
Check the ETACS-ECU.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
DATA LINK DATA LINK (1) Connect the special tool. Refer to "How to connect SWS
CONNECTOR CONNECTOR monitor P.54B-7.
(13-PIN) (16-PIN)
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate scan tool MB991958 according to the procedure
below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
MB991911 3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."
MB991806 (4) Scan tool MB991958 should show "OK" on the "ECU
MB991862
COMM CHK" menu for the "ETACS ECU" menu.
MB991824 Q: Is "OK" displayed on the "ETACS ECU" menu?
YES : Go to Step 2.
NO : Refer to Inspection Procedure A-3 "Communication
with ETACS-ECU is not possible P.54B-41."

MB991827 AC309091AB

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-51

STEP 2. Check the front-ECU connector A-07X for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is the front-ECU connector A-07X in good condition?
CONNECTOR : A-07X
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. The system should communicate with the
front-ECU normally.

RELAY BOX SIDE

11 10 9 8 7 6 5 4 3 2 1
AC204183 AB

STEP 3. Check the battery power supply circuit to the

front-ECU. Test at front-ECU connector A-07X.
(1) Disconnect front-ECU connector A-07X and measure the
CONNECTOR : A-07X
voltage available at the relay box side of the connector.

RELAY BOX SIDE

11 10 9 8 7 6 5 4 3 2 1
AC204183 AB

(2) Measure the voltage between terminal 7 and ground.

• The voltage should be approximately 12 volts (battery
positive voltage).
CONNECTOR A-07X Q: Is the measured voltage approximately 12 volts (battery
(RELAY BOX SIDE) positive voltage)?
YES : Go to Step 5.
NO : Go to Step 4.

11 10 9 8 7 6 5 4 3 2 1
ACX01287AB

STEP 4. Check the wiring harness between front-ECU

connector A-07X (terminal 7) and the battery.
Q: Is the wiring harness between front-ECU connector A-
CONNECTOR : A-07X
07X (terminal 7) and the battery in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the front-ECU normally.
RELAY BOX SIDE
11 10 9 8 7 6 5 4 3 2 1
AC204183 AB

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54B-52 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 5. Check the front-ECU connector A-08X for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is front-ECU connector A-08X in good condition?
CONNECTOR : A-08X
YES : Go to Step 6.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. The system should communicate with the
front-ECU normally.

RELAY BOX SIDE

AC204183 AS

STEP 6. Check the ground circuit to the front-ECU. Test at

front-ECU connector A-08X.
(1) Disconnect front-ECU connector A-08X and measure the
CONNECTOR : A-08X
resistance available at the relay box side of the connector.

RELAY BOX SIDE

AC204183 AS

(2) Measure the resistance value between terminal 31 and

ground.
• The resistance should equal 2 ohms or less.
CONNECTOR A-08X Q: Is the measured resistance 2 ohms or less?
(RELAY BOX SIDE)
YES : Go to Step 8.
NO : Go to Step 7.

31 30 29 28 27 26 25 24 23 22 21
ACX01288AB

STEP 7. Check the wiring harness between front-ECU

connector A-08X (terminal 31) and the ground.
Q: Is the wiring harness between front-ECU connector A-
CONNECTOR : A-08X
08X (terminal 31) and ground in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the front-ECU normally.
RELAY BOX SIDE

AC204183 AS

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-53

STEP 8. Check the ETACS-ECU connector D-224 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector D-224 in good condition?
CONNECTOR : D-224
YES : Go to Step 9.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. The system should communicate with the
front-ECU normally.
HARNESS SIDE

3029 28 27 26 25 24 23 22 21
D-224(B) 40 39 38 37 36 35 3433 32 31
AC204174 AL

STEP 9. Check the wiring harness between front-ECU

connector A-08X (terminal 22) and ETACS-ECU connector
D-224 (terminal 21).
CONNECTOR : A-08X

RELAY BOX SIDE

AC204183 AS

CONNECTOR : D-224

HARNESS SIDE

3029 28 27 26 25 24 23 22 21
D-224(B) 40 39 38 37 36 35 3433 32 31
AC204174 AL

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54B-54 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTOR : D-28 NOTE: Also check intermediate connector D-28 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector D-28 is damaged, repair or
replace the damaged component(s) as described in GROUP
00E, Harness Connector Inspection P.00E-2.
Q: Is the wiring harness between front-ECU connector A-
08X (terminal 22) and ETACS-ECU connector D-224
(terminal 21) in good condition?
YES : Go to Step 10.
AC400706AF NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the front-ECU normally.

STEP 10. Replace the ECU.

(1) Replace the front-ECU.
(2) The system should communicate with the front-ECU
normally.
Q: Can the system communicate with the front-ECU?
YES : No action is necessary and testing is complete.
NO : Replace the ETACS-ECU. The system should
communicate with the front-ECU normally.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-55

INSPECTION PROCEDURE A-5: Communication with the sunroof motor assembly (sunroof-ECU) is
not possible.

Sunroof Motor Assembly (Sunroof-ECU) and SWS Communication Circuit

FUSIBLE IGNITION FUSIBLE

LINK 4 SWITCH (IG2) LINK 2

RELAY
JUNCTION BOX
BLOCK

JUNCTION
BLOCK

SUNROOF MOTOR
ASSEMBLY

CONTROL CIRCUIT

DATA LINK ETACS-

CONNECTOR ECU
FRONT SIDE

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54B-56 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

FUSIBLE LINK (1), (4) CONNECTORS : D-26, D-28

FUSIBLE LINK (4)

D-28
D-26
FUSIBLE LINK (1)

BATTERY
ACX02274 AE AC400706AK

CONNECTORS : D-207, D-208, D-210, D-211 CONNECTOR : D-224

D-207 D-208
D-210

D-211(B)

D-224(B)
AC204173 AP AC204174 AG

CONNECTORS : F-02, F-24

F-02
F-24

AC204177 AJ

TECHNICAL DESCRIPTION (COMMENT)

.

CIRCUIT OPERATION
• Power to the sunroof motor assembly is supplied The power supply circuit or the communication circuit
through fusible links (1) and (4). to the sunroof motor assembly or the sunroof motor
• When the ignition switch (IG2) signal is on, the assembly may be defective.
sunroof motor assembly is ready to operate. .

TROUBLESHOOTING HINTS
• The sunroof motor assembly may be defective
.

• The wiring harness or connectors may have

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-57
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B

STEP 1. Check sunroof motor assembly connector F-02 for

loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is sunroof motor assembly connector F-02 in good
CONNECTOR : F-02
condition?
HARNESS SIDE YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. The system should communicate with the
sunroof motor assembly (sunroof-ECU) normally.

AC204177 AQ

STEP 2. Check the fusible link (1) line of power supply

circuit to the sunroof motor assembly. Test at sunroof
motor assembly connector F-02.
(1) Disconnect sunroof motor assembly connector F-02 and
CONNECTOR : F-02
measure the voltage available at the wiring harness side of
HARNESS SIDE the connector.

AC204177 AQ

(2) Measure the voltage between terminal 3 and ground.

• The voltage should be approximately 12 volts (battery
CONNECTOR: F-02 positive voltage).
(HARNESS SIDE)
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Go to Step 4.
4 3 2 1
NO : Go to Step 3.
10 9 8 7 6 5

AC204458 AB

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54B-58 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 3. Check the wiring harness between sunroof motor

assembly connector F-02 (terminal 3) and fusible link (1).
FUSIBLE LINK (1)

BATTERY
ACX02274 AE

CONNECTORS : F-02, F-24

F-02

F-24

HARNESS SIDE
F-02
4 3 2 1
10 9 8 7 6 5

F-24
1 2
3 4 5 6

AC204195 AB

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-59
CONNECTORS : D-26, D-28 NOTE: Also check junction block connectors D-207, D-221,
intermediate connectors D-26, D-28 and F-24 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If junction block connectors D-207, D-221, interme-
diate connectors D-26, D-28 or F-24 is damaged, repair or
replace the damaged component(s) as described in GROUP
D-26 00E, Harness Connector Inspection P.00E-2.
D-28 Q: Is the wiring harness between sunroof motor assembly
connector F-02 (terminal 3) and fusible link (1) in good
condition?
HARNESS SIDE YES : No action is necessary and testing is complete.
D-26 NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the sunroof motor assembly
D-28
(sunroof-ECU) normally.

AC400707AN

CONNECTORS : D-207, D-221

D-207

D-221

HARNESS SIDE
D-207
4 3 2 1

D-221
2 1
8 7 6 5 4 3

AC204191 BK

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54B-60 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 4. Check the fusible link (4) line of power supply

circuit to the sunroof motor assembly. Test at sunroof
motor assembly connector F-02.
(1) Disconnect sunroof motor assembly connector F-02 and
CONNECTOR : F-02
measure the voltage available at the wiring harness side of
HARNESS SIDE the connector.

AC204177 AQ

(2) Measure the voltage between terminal 1 and ground.

• The voltage should be approximately 12 volts (battery
CONNECTOR: F-02 positive voltage).
(HARNESS SIDE)
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Go to Step 6.
4 3 2 1
NO : Go to Step 5.
10 9 8 7 6 5

AC201738 AC

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-61

STEP 5. Check the wiring harness between sunroof motor

assembly connector F-02 (terminal 1) and fusible link (4).
FUSIBLE LINK (4)

BATTERY
ACX02274 AD

CONNECTORS : F-02, F-24

F-02

F-24

HARNESS SIDE
F-02
4 3 2 1
10 9 8 7 6 5

F-24
1 2
3 4 5 6

AC204195 AB

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54B-62 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTORS : D-26, D-28 NOTE: Also check intermediate connectors D-26, D-28 and F-
24 for loose, corroded, or damaged terminals, or terminals
pushed back in the connector. If intermediate connector D-26,
D-28 or F-24 is damaged, repair or replace the damaged com-
ponent(s) as described in GROUP 00E, Harness Connector
Inspection P.00E-2.
D-26 Q: Is the wiring harness between sunroof motor assembly
D-28 connector F-02 (terminal 1) and fusible link (4) in good
condition?
YES : No action is necessary and testing is complete.
HARNESS SIDE NO : The wiring harness may be damaged or the
D-26 connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the sunroof motor assembly
(sunroof-ECU) normally.
D-28

AC400707AN

STEP 6. Check the ignition switch (IG2) circuit to the

sunroof motor assembly. Test at sunroof motor assembly
connector F-02.
(1) Disconnect sunroof motor assembly connector F-02 and
CONNECTOR : F-02
measure the voltage available at the wiring harness side of
HARNESS SIDE the connector.
(2) Turn the ignition switch to the "ON" position.

AC204177 AQ

(3) Measure the voltage between terminal 2 and ground.

• The voltage should be approximately 12 volts (battery
CONNECTOR: F-02 positive voltage).
(HARNESS SIDE)
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Go to Step 8.
4 3 2 1
NO : Go to Step 7.
10 9 8 7 6 5

AC201740AC

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-63

STEP 7. Check the wiring harness between sunroof motor

assembly connector F-02 (terminal 2) and ignition switch
(IG2).
CONNECTORS : F-02, F-24

F-02

F-24

HARNESS SIDE
F-02
4 3 2 1
10 9 8 7 6 5

F-24
1 2
3 4 5 6

AC204195 AB

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54B-64 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTOR : D-26 NOTE: Also check junction block connectors D-208, D-210,
intermediate connectors D-26 and F-24 for loose, corroded, or
damaged terminals, or terminals pushed
back in the connector. If junction block connector D-208, D-
210, intermediate connectors D-26 or F-24 is damaged, repair
or replace the damaged component(s) as described in GROUP
00E, Harness Connector Inspection P.00E-2.
Q: Is the wiring harness between sunroof motor assembly
connector F-02 (terminal 2) and the ignition switch (IG2)
AC400706AL in good condition?
YES : No action is necessary and testing is complete.
CONNECTORS: D-208, D-210
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
D-208 Repair the wiring harness as necessary. The system
D-210
should communicate with the sunroof motor assembly
(sunroof-ECU) normally.

HARNESS SIDE

D-208

D-210

AC204191 BJ

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-65

STEP 8. Check the ground circuit to the sunroof motor

assembly. Test at sunroof motor assembly connector F-02.
(1) Disconnect sunroof motor assembly connector F-02 and
CONNECTOR : F-02
measure the resistance available at the wiring harness side
HARNESS SIDE of the connector.

AC204177 AQ

(2) Measure the resistance value between terminal 5 and

ground.
• The resistance should equal 2 ohms or less.
CONNECTOR: F-02 Q: Is the measured resistance 2 ohms or less?
(HARNESS SIDE)
YES : Go to Step 10.
4 3 2 1 NO : Go to Step 9.
10 9 8 7 6 5

AC201746 AC

STEP 9. Check the wiring harness between sunroof motor

assembly connector F-02 (terminal 5) and ground.
Q: Is the wiring harness between sunroof motor assembly
CONNECTOR : F-02
connector F-02 (terminal 5) and ground in good
HARNESS SIDE condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the sunroof motor assembly
AC204177 AQ
(sunroof-ECU) normally.

STEP 10. Check ETACS-ECU connector D-224 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector D-224 in good condition?
CONNECTOR : D-224
YES : Go to Step 11.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. The system should communicate with the
sunroof motor assembly (sunroof-ECU) normally.
HARNESS SIDE

3029 28 27 26 25 24 23 22 21
D-224(B) 40 39 38 37 36 35 3433 32 31
AC204174 AL

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54B-66 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 11. Check the wiring harness between sunroof motor

assembly connector F-02 (terminal 10) and ETACS-ECU
connector D-224 (terminal 21).
CONNECTOR : D-224

HARNESS SIDE

3029 28 27 26 25 24 23 22 21
D-224(B) 40 39 38 37 36 35 3433 32 31
AC204174 AL

CONNECTORS : F-02, F-24

F-02

F-24

HARNESS SIDE
F-02
4 3 2 1
10 9 8 7 6 5

F-24
1 2
3 4 5 6

AC204195 AB

CONNECTOR : D-26 NOTE: Also check intermediate connectors D-26 and F-24 for
loose, corroded, or damaged terminals, or terminals pushed
back in the connector. If intermediate connector D-26 or F-24 is
damaged, repair or replace the damaged component(s) as
described in GROUP 00E, Harness Connector Inspection
P.00E-2.
Q: Is the wiring harness between sunroof motor assembly
connector F-02 (terminal 10) and ETACS-ECU connector
D-224 (terminal 21) in good condition?
AC400706AL
YES : Go to Step 12.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the sunroof motor assembly
(sunroof-ECU) normally.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-67

STEP 12. Replace the ECU.

(1) Replace the sunroof motor assembly.
(2) The system should communicate with the sunroof motor
assembly normally.
Q: Can the system communicate with the sunroof motor
assembly?
YES : No action is necessary and testing is complete.
NO : Replace the ETACS-ECU. The system should
communicate with the sunroof motor assembly
(sunroof-ECU) normally.

INSPECTION PROCEDURE A-6: Communication with the RV meter is not possible.

NOTE: This troubleshooting procedure requires the

use of scan tool MB991958 and SWS monitor kit
MB991862. For details of how to use the SWS moni-
tor, refer to "How to use SWS monitor P.54B-10."
RV Meter and and SWS Communication Circuit

RV METER

DATA LINK COLUMN

CONNECTOR SWITCH
COLUMN-ECU
FRONT SIDE

CONNECTOR : D-08 CONNECTOR : D-203

D-08(B)

AC400706 AM AC204172 AG

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54B-68 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

TECHNICAL DESCRIPTION (COMMENT) TROUBLESHOOTING HINTS

The RV meter or its power supply circuit or communi- • The RV meter may be defective
cation circuit may be defective. • The wiring harness or connectors may have
.
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
• MB991854: SWS Monitor Harness (For 13-pin)

STEP 1. Use scan tool MB991958 to select "ECU COMM

CHK" on the SWS monitor display.
Check the column-ECU.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
DATA LINK DATA LINK (1) Connect the special tool. Refer to "How to connect SWS
CONNECTOR CONNECTOR monitor P.54B-7.
(13-PIN) (16-PIN)
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate scan tool MB991958 according to the procedure
below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
MB991911 3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."
MB991806 (4) Scan tool MB991958 should show "OK" on the "ECU
MB991862
COMM CHK" menu for the "COLUMN ECU" menu.
MB991824 Q: Is "OK" displayed on the "COLUMN ECU" menu?
YES : Go to Step 2.
NO : Refer to Inspection Procedure A-2 "Communication
with column switch (column-ECU) is impossible
P.54B-34."

MB991827 AC309091AB

STEP 2. Check the RV meter.

Q: Does the RV meter work normally?
YES : Go to Step 3.
NO : Carry out troubleshooting for the RV meter first. Refer
to GROUP 54A, RV meter P.54A-236.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-69

STEP 3. Check RV meter connector D-08 and column

switch connector D-203 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
CONNECTOR : D-08 Q: Are RV meter connector D-08 and column switch
connector D-203 in good condition?
D-08(B)
YES : Go to Step 4.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. The system should communicate with the
RV meter normally.
HARNESS SIDE

AC400706 AN

CONNECTOR : D-203
HARNESS SIDE
5 4 3 2 1
10 9 8 7 6

AC204172 AM

STEP 4. Check the wiring harness between RV meter

connector D-08 (terminal 6) and column switch connector
D-203 (terminal 3).
CONNECTOR : D-08 Q: Is the wiring harness between RV meter connector D-08
(terminal 6) and column switch connector D-203
D-08(B)
(terminal 3) in good condition?
YES : Replace the RV meter. The system should
communicate with the RV meter normally.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
HARNESS SIDE
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
AC400706 AN should communicate with the RV meter normally.

CONNECTOR : D-203
HARNESS SIDE
5 4 3 2 1
10 9 8 7 6

AC204172 AM

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54B-70 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

TONE ALARM
GENERAL DESCRIPTION CONCERNING TONE ALARM
M1549021000285
The ECU related to the alarm function types and var-
ious control functions are as follows.
FUNCTION CONTROL ECU
Ignition key reminder tone alarm function ETACS-ECU
Light reminder tone alarm function ETACS-ECU, column switch
Seat belt tone alarm function ETACS-ECU
RV meter operating sound function ETACS-ECU, RV meter

Ignition key reminder tone alarm function

When the driver’s door is opened with the ignition key inserted
ON
Ignition switch
(IG1)
in the ignition key cylinder (ignition switch is in the OFF posi-
OFF
tion) the tone alarm sounds intermittently (horning sound) to
Key ON
reminder (Key removed) indicate that the ignition key has not been removed.
switch OFF
(Key inserted)
Driver's ON (Open)
door
switch OFF (Closed)
Ignition key ON (Tone alarm
inserted sounds)
reminder OFF (Tone alarm
tone alarm does not sound)
output
AC005427AB

Light reminder tone alarm function

When the taillight or headlight is ON, if the ignition key is
Tail light or ON
headlight removed and the driver's door is opened, a tone alarm will
OFF
Key ON
sound continuously to warn that the light is illuminated. How-
reminder (Key removed) ever, if the taillight or headlight has been turned off by the
switch OFF
(Key inserted) headlight automatic-shutdown function, the tone alarm will not
Driver's
door
ON (Open) sound.
switch OFF (Closed)

Light ON (Tone alarm

reminder sounds)
OFF (Tone alarm
tone does not sound)
alarm output AC005428 AB

Seat belt tone alarm function

If any of the following conditions is met with the igni- • The ETACS-ECU sounds the tone alarm 12
tion switch at "ON" or "ST", the ETACS-ECU sounds cycles (after 0.5 second) if the seat belt switch is
the tone alarm by using the driver's seat belt switch on (driver's seat belt is not fastened) when sixty
signal. seconds or more have elapsed since the ignition
• The ETACS-ECU sounds the tone alarm for six switch is turned "ON". One cycle consists of five-
seconds if the ignition switch is turned "ON" while second "on" and then three-second "off".
the seat belt switch is on (the driver's seat belt is NOTE: The ETACS-ECU stops sounding immedi-
not fastened). ately when the seat belt witch is off (driver's seat belt
is fastened) or the ignition switch is turned to the
"OFF" or "ACC" position while the seat belt tone
alarm function is working.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-71

ON
Ignition
switch (IG1)
OFF

ON
(UNFASTENED)
Seat
belt
switch OFF
(FASTENED)
12cycles (approx. 90 seconds)
Seat ON
belt (Tone alarm
tone sounds)
alarm
output OFF
(Tone alarm
does not 6 seconds 5 seconds T
sound)
60 seconds 1cycle
(approx. 8 seconds)
T: 3 seconds
ON
(Tone alarm
sounds)
Seat belt
tone alarm OFF
sounding (Tone alarm t1 t1 t1 t2
cycle does not
sound)
t1: 0.16 second
1 second t2: 0.52 second
AC308767 AB

RV meter operating sound function

When tone alarm sounding is requested from the RV
meter, the ETACS-ECU activates the built-in tone
alarm. The RV meter will "beep" when adjusting the
brightness level, only with the ignition key in the
"ACC" position.

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54B-72 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

General circuit diagram for Ignition key reminder tone alarm function

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-73
General circuit diagram for light reminder tone alarm function

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54B-74 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

General circuit diagram for seat belt tone alarm function

General circuit diagram for RV meter operating sound function

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-75

INSPECTION PROCEDURE B-1: Tone Alarm: Ignition key reminder tone alarm function does not work
normally.

NOTE: This troubleshooting procedure requires the

use of scan tool MB991958 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor P.54B-10."

Ignition Key Reminder Tone Alarm Function

. .

CIRCUIT OPERATION TECHNICAL DESCRIPTION (COMMENT)

The ETACS-ECU operates the ignition key reminder If the function does not work normally, the input cir-
tone alarm function (sounds the tone alarm intermit- cuit system from the switches or the ETACS-ECU
tently), based on input signals from the following may be defective (refer to "CIRCUIT OPERATION").
switches:
• Ignition switch (IG1): OFF
.

TROUBLESHOOTING HINTS
• Key reminder switch: OFF • The key reminder switch may be defective
• Driver’s door switch: ON • The front door switches may be defective
The ETACS-ECU operates the ignition key reminder • The ETACS-ECU may be defective
tone alarm function (sounds the tone alarm intermit- • The wiring harness or connectors may have
tently) if any of the following conditions are satisfied: loose, corroded, or damaged terminals, or termi-
• Ignition switch: LOCK position (key inserted) nals pushed back in the connector
• Driver’s door: OPEN

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54B-76 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
• MB991854: SWS Monitor Harness (For 13-pin)

STEP 1. Use scan tool MB991958 to select "ECU COMM

CHK" on the SWS monitor display.
Check the ETACS-ECU.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
DATA LINK DATA LINK (1) Connect the special tool. Refer to "How to connect SWS
CONNECTOR CONNECTOR monitor P.54B-7
(13-PIN) (16-PIN)
(2) Connect SWS monitor kit MB991862 to the data link
connector (13-pin).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Operate scan tool MB991958 according to the procedure
below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
MB991911
2. Select "SWS."
MB991806 3. Select "SWS MONITOR."
MB991862
4. Select "ECU COMM CHK."
MB991824 (5) Scan tool MB991958 should show "OK" on the "ECU
COMM CHK" menu for the "ETACS ECU" menu.
Q: Is "OK" displayed on the "ETACS ECU" menu?
YES : Go to Step 2.
NO : Refer to Inspection Procedure A-3 "Communication
with ETACS-ECU is not possible P.54B-41."

MB991827 AC309091AB

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STEP 2. Check the input signal by using "FUNCTION

DIAG." menu of the SWS monitor.
Check the input signals from the following switches:
• Ignition switch: OFF (key inserted)
• Driver’s door: open
• Front passenger's door: closed
DATA LINK DATA LINK Operate scan tool MB991958 according to the procedure below
CONNECTOR CONNECTOR to display "KEY RMND. ALM."
(13-PIN) (16-PIN)
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "BUZZER."
MB991911 6. Select "KEY RMND. ALM."
Check that normal conditions are displayed on the items
MB991862
MB991806 described in the table below.
NOTE: The scan tool display changes when the driver's or the
MB991824 front passenger's door is opened. If any of the doors is open,
the system can not be checked correctly.
ITEM NO. ITEM NAME NORMAL
CONDITION
ITEM 30 IG SW (IG1) OFF
ITEM 32 FRONT DOOR SW ON
MB991827 AC309091AB
ITEM 43 BUZZER ON

Q: Are normal conditions displayed on the "IG SW (IG1)",

"FRONT DOOR SW" and "BUZZER"?
Normal conditions are displayed for all the items :
Replace the ETACS-ECU. The ignition key reminder
tone alarm function should now work normally.
The scan tool does not show the respective normal
condition for item "IG SW (IG1)." : Refer to Inspection
Procedure O-2 "ETACS-ECU does not receive any
signal from the ignition switch (IG1) P.54B-496."
The scan tool does not show the respective normal
condition for item "FRONT DOOR SW." : Refer to
Inspection Procedure O-5 "ETACS-ECU does not
receive any signal from the driver's or the front
passenger's door switch P.54B-509."
The scan tool does not show the respective normal
condition for item "BUZZER." : Go to Step 3.

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54B-78 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 3. Check the input signal (by using the pulse check
mode of the monitor.)
Check the input signals from the key reminder switch.
DATA LINK DATA LINK Operate scan tool MB991958 according to the procedure below
CONNECTOR CONNECTOR to display "PULSE CHECK."
(13-PIN) (16-PIN)
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."
• Check whether scan tool MB991958 sounds or not when
the ignition key is removed and reinserted.
MB991911 Q: Does scan tool MB991958 sound when the ignition key
is removed and reinserted?
MB991806 YES : Replace the ETACS-ECU. The ignition key reminder
MB991862
tone alarm function should now work normally.
MB991824 NO : Refer to Inspection Procedure P-1 "ETACS-ECU does
not receive any signal from the key reminder switch
P.54B-532."

MB991827 AC309091AB

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-79

INSPECTION PROCEDURE B-2: Tone Alarm: Light reminder tone alarm function does not work
normally.

NOTE: This troubleshooting procedure requires the

use of scan tool MB991958 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor P.54B-10."

Light Reminder Tone Alarm Function

. .

CIRCUIT OPERATION TECHNICAL DESCRIPTION (COMMENT)

The ETACS-ECU operates the light reminder tone If the function does not work normally, the input cir-
alarm function intermittently according to the follow- cuit system from the switches or the ETACS-ECU
ing signals: may be defective (refer to "CIRCUIT OPERATION").
• Ignition switch (IG1): OFF
• Front door switch (LH): ON
.

TROUBLESHOOTING HINTS
• Taillight switch: ON • The front door switches may be defective
• Headlight switch: ON • The column switch (turn-signal light and lighting
The ETACS-ECU operates the light reminder tone switch) may be defective
alarm function intermittently under the following con- • The ETACS-ECU may be defective
ditions. • The wiring harness or connectors may have
• Ignition switch: LOCK position (key removed) loose, corroded, or damaged terminals, or termi-
• Driver’s door: OPEN nals pushed back in the connector
• Lighting Switch: Tail or Head position

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54B-80 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
• MB991854: SWS Monitor Harness (For 13-pin)

STEP 1. Use scan tool MB991958 to select "ECU COMM

CHK" on the SWS monitor display.
Check the following ECUs:
• ETACS-ECU
• Column-ECU
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
DATA LINK DATA LINK (1) Connect the special tool. Refer to "How to connect SWS
CONNECTOR CONNECTOR monitor P.54B-7
(13-PIN) (16-PIN)
(2) Connect SWS monitor kit MB991862 to the data link
connector (13-pin).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Operate scan tool MB991958 according to the procedure
below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
MB991911
2. Select "SWS."
MB991806 3. Select "SWS MONITOR."
MB991862
4. Select "ECU COMM CHK."
MB991824 (5) Scan tool MB991958 should show "OK" on the "ECU
COMM CHK" menus for both the "ETACS ECU" and the
"COLUMN ECU" menus.
Q: Is "OK" displayed on both the "ETACS ECU" and
"COLUMN ECU" menus?
"OK" are displayed for all the items : Go to Step 2.
"NG" is displayed on the "ETACS ECU" menu : Refer to
MB991827 AC309091AB
Inspection Procedure A-3 "Communication with
ETACS-ECU is not possible P.54B-41."
"NG" is displayed on the "COLUMN ECU" menu : Refer
to Inspection Procedure A-2 "Communication with
column switch (column-ECU) is not possible P.54B-
34."

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-81

STEP 2. Check the input signal by using "FUNCTION

DIAG." menu of the SWS monitor.
Check the input signals from the following switches:
• Ignition switch: OFF (key removed)
• Lighting switch: TAIL or HEAD
• Driver’s door: open
• Front passenger's door: closed
DATA LINK DATA LINK Operate scan tool MB991958 according to the procedure below
CONNECTOR CONNECTOR to display "LGT MONI. ALRM."
(13-PIN) (16-PIN)
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "BUZZER."
MB991911 6. Select "LGT MONI. ALRM."
Check that normal conditions are displayed on the items
MB991862
MB991806 described in the table below.
ITEM NO. ITEM NAME NORMAL
MB991824
CONDITION
ITEM 00 HEADLIGHT SW Either of items
is ON
ITEM 01 TAILLIGHT SW
ITEM 30 IG SW (IG1) OFF
ITEM 32 FRONT DOOR SW ON
MB991827 AC309091AB ITEM 35 H/L AUTO-CUT OFF
ITEM 43 BUZZER ON

Q: Are normal conditions displayed for "HEADLIGHT SW",

"TAILLIGHT SW", "IG SW IG1", "FRONT DOOR SW", "H/
L AUTO-CUT" and "BUZZER"?
Normal conditions are displayed for all the items :
Replace the ETACS-ECU. The light reminder tone
alarm function should now work normally.
The scan tool does not show the respective normal
condition for item "HEADLIGHT SW" : Refer to
Inspection Procedure O-6 "ETACS-ECU does not
receive any signal from the headlight switch P.54B-
516."
The scan tool does not show the respective normal
condition for item "TAILLIGHT SW" : Refer to Inspection
Procedure O-6 "ETACS-ECU does not receive any
signal from the taillight switch P.54B-516."
The scan tool does not show the respective normal
condition for item "IG SW (IG1)" : Refer to Inspection
Procedure O-2 "ETACS-ECU does not receive any
signal from the ignition switch (IG1) P.54B-496."

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54B-82 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

The scan tool does not show the respective normal

condition for item "FRONT DOOR SW" : Refer to
Inspection Procedure O-5 "ETACS-ECU does not
receive any signal from the driver's or the front
passenger's door switch P.54B-509."
The scan tool does not show the respective normal
condition for item "H/L AUTO-CUT" : Refer to Inspection
Procedure J-9 "Headlight automatic shutdown
function does not work normally P.54B-354."
The scan tool does not show the respective normal
condition for item "BUZZER" : Replace the ETACS-ECU.
The light reminder tone alarm function should now
work normally.

INSPECTION PROCEDURE B-3: Tone Alarm: Seat belt tone alarm function does not work normally.

NOTE: This troubleshooting procedure requires the

use of scan tool MB991958 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor P.54B-10."

Seat Belt Tone Alarm Function

TECHNICAL DESCRIPTION (COMMENT)

.

CIRCUIT OPERATION
The ETACS-ECU operates the seat belt tone alarm If the function does not work normally, the input cir-
function intermittently according to signals from the cuit system from the switches or the ETACS-ECU
following switches: may be defective (refer to "CIRCUIT OPERATION").
• Ignition switch (IG1): ON .

• Driver's seat belt switch: ON TROUBLESHOOTING HINTS

The ETACS-ECU operates the seat belt tone alarm • The driver's seat belt switch may be defective
function intermittently under the following conditions: • The ETACS-ECU may be defective
• Ignition switch: ON or START • The wiring harness or connectors may have
• Driver’s seat belt: UNFASTENED loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
.

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 SIMPLIFIED WIRING SYSTEM (SWS)
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54B-83
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
• MB991854: SWS Monitor Harness (For 13-pin)

STEP 1. Use scan tool MB991958 to select "ECU COMM

CHK" on the SWS monitor display.
Check the ETACS-ECU.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
DATA LINK DATA LINK (1) Connect the special tool. Refer to "How to connect SWS
CONNECTOR CONNECTOR monitor P.54B-7.
(13-PIN) (16-PIN)
(2) When the ignition switch is turned to the "ON" position.
(3) Operate scan tool MB991958 according to the procedure
below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
MB991911 3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."
MB991806 (4) Scan tool MB991958 should show "OK" on the "ECU
MB991862
COMM CHK" menu for the "ETACS ECU" menu.
MB991824 Q: Is "OK" displayed on the "ETACS ECU" menu?
YES : Go to Step 2.
NO : Refer to Inspection Procedure A-3 "Communication
with ETACS-ECU is not possible P.54B-41."

MB991827 AC309091AB

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54B-84 SIMPLIFIED WIRING SYSTEM (SWS)
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STEP 2. Check the input signal by using "DATA LIST"

menu of the SWS monitor.
Turn the ignition switch to the "ON" position before checking
input signals from the ignition switch (IG1).
DATA LINK DATA LINK Operate scan tool MB991958 according to the procedure below
CONNECTOR CONNECTOR to display "ETACS ECU."
(13-PIN) (16-PIN)
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "DATA LIST."
5. Select "ETACS ECU."
MB991911 Check that normal conditions are displayed on the items
described in the table below.
MB991806
MB991862 ITEM NO. ITEM NAME NORMAL CONDITION
MB991824 ITEM 30 IG SW (IG1) ON

Q: Is normal condition displayed on the "IG SW (IG1)"?

YES : Go to Step 3.
NO : Refer to Inspection Procedure O-2 "ETACS-ECU
does not receive any signal from the ignition switch
(IG1) P.54B-496."
MB991827 AC309091AB

STEP 3. Check the input signal (by using the pulse check
mode of the monitor.)
Check input signal from the driver's side seat belt switch.
Operate scan tool MB991958 according to the procedure below
DATA LINK
CONNECTOR to display "PULSE CHECK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."
• When the driver's seat belt is unfastened, check if scan tool
MB991958 sounds or not.

MB991911
Q: Does scan tool MB991958 sound when the driver's side
seat belt is unfastened?
YES : Replace the ETACS-ECU. Verify that the seat belt
MB991824 tone alarm function now works normally.
NO : Refer to Inspection Procedure P-3 "ETACS-ECU does
not receive any signal from the driver's seat belt
switch P.54B-540."

MB991827 AC307591 AB

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54B-85

INSPECTION PROCEDURE B-4: Tone Alarm: RV meter operating sound function does not work
normally.

NOTE: This troubleshooting procedure requires the

use of scan tool MB991958 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor P.54B-10."

RV Meter Annunciation Function

. .

CIRCUIT OPERATION TROUBLESHOOTING HINTS

The ETACS-ECU sound a tone alarm when the RV • The RV meter may be defective
meter sends a sound request signal to the ECU. • The ETACS-ECU may be defective
.
• The wiring harness or connectors may have
TECHNICAL DESCRIPTION (COMMENT) loose, corroded, or damaged terminals, or termi-
If this function does not work normally, the RV meter, nals pushed back in the connector
the ETACS-ECU or their communication circuit may
be defective.

DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
• MB991854: SWS Monitor Harness (For 13-pin)

STEP 1. Check the RV meter.

Q: Does the RV meter work normally?
YES : Go to Step 2.
NO : Check the RV meter. Refer to GROUP 54A, RV meter
P.54A-247.

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54B-86 SIMPLIFIED WIRING SYSTEM (SWS)
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STEP 2. Use scan tool MB991958 to select "ECU COMM

CHK" on the SWS monitor display.
Check the following ECUs:
• ETACS-ECU
• RV meter
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
DATA LINK DATA LINK (1) Connect the special tool. Refer to "How to connect SWS
CONNECTOR CONNECTOR monitor P.54B-7
(13-PIN) (16-PIN)
(2) Connect SWS monitor kit MB991862 to the data link
connector (13-pin).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Operate scan tool MB991958 according to the procedure
below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
MB991911
2. Select "SWS."
MB991806 3. Select "SWS MONITOR."
MB991862
4. Select "ECU COMM CHK."
MB991824 (5) Scan tool MB991958 should show "OK" on the "ECU
COMM CHK" menus for both the "ETACS ECU" and the
"CENTER DISP." menus.
Q: Is "OK" displayed on both the "ETACS ECU" and
"CENTER DISP." menu?
"OK" are displayed for all the items : Go to Step 3.
"NG" is displayed on the "ETACS ECU" menu : Refer to
MB991827 AC309091AB
Inspection Procedure A-3 "Communication with
ETACS-ECU is not possible P.54B-41."
"NG" is displayed on the "CENTER DISP." menu : Refer
to Inspection procedure A-6 "Communication with RV
meter is not possible P.54B-67."

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-87

STEP 3. Check the input signal by using "FUNCTION

DIAG." menu of the SWS monitor.
Turn the ignition switch to the "ON" position to check the input
signals from the following switches.
DATA LINK DATA LINK Operate scan tool MB991958 according to the procedure below
CONNECTOR CONNECTOR to display "CENTR. DIS. ALM."
(13-PIN) (16-PIN)
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "BUZZER."
MB991911 6. Select "CENTR. DIS. ALM."
When the RV meter display switch is operated, check that nor-
MB991862
MB991806 mal conditions are displayed on the items described in the table
below.
MB991824
ITEM NO. ITEM NAME NORMAL
CONDITION
ITEM 43 BUZZER ON
ITEM 60 beep data ON (2 kHz)

Q: Are normal conditions displayed on the "BUZZER" and

MB991827 AC309091AB "beep data"?
Normal conditions are displayed for all the items :
Replace the ETACS-ECU. Verify that the RV meter
operating sound function works normally.
The scan tool does not show the respective normal
condition for item "BUZZER." : Replace the ETACS-ECU.
Verify that the RV meter operating sound function
works normally.
The scan tool does not show the respective normal
condition for item "beep data." : Refer to Inspection
Procedure O-10 "ETACS-ECU does not receive
signal from any control switches P.54B-529."

CENTRAL DOOR LOCKING SYSTEM

GENERAL DESCRIPTION CONCERNING THE CENTRAL DOOR LOCKING SYSTEM
M1549021100345
The following ECUs affect the functions and control
of the central door locking system.
FUNCTION CONTROL ECU
Door lock function Operating the driver’s or front passenger’s door lock key ETACS-ECU
cylinder
Operating the driver’s or front passenger’s door lock switch
Operating the driver’s door inside lock knob
Door unlock function Operating the driver’s door lock key cylinder
Operating the front passenger’s door lock key cylinder
Operating the driver’s or front passenger’s door lock switch
Forgotten key prevention function

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54B-88 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

DOOR LOCK FUNCTION

.

OPERATING THE DRIVER’S OR FRONT PASSENGER’S

DOOR LOCK KEY CYLINDER
When you insert the ignition key to the driver’s or front passen-
ger’s door lock key cylinder and turn the key clockwise to lock
the door, the ETACS-ECU energizes its door lock relay for 0.5
DRIVER'S OR
ON
PASSENGER'S (LOCK) second to activate all the door lock actuators. Then all the
DOOR LOCK doors will be locked.
KEY CYLINDER OFF
SWITCH

ON
LOCK RELAY
OUTPUT
OFF
0.5 second

ALL DOOR'S LOCK

LOCK
ACTUATOR UNLOCK

AC203730AB

OPERATING THE DRIVER’S OR FRONT PASSENGER’S

DOOR LOCK SWITCH
When the door is locked by driver’s or front passenger’s door
DRIVER'S OR ON(LOCK)
FRONT lock switch, the ETACS-ECU energizes its door lock relay for
PASSENGER'S
DOOR LOCK
OFF 0.5 second to activate all the door lock actuators. Then all the
SWITCH ON(UNLOCK) doors will be locked.
ON
LOCK RELAY
OUTPUT t
OFF

LOCK
ALL DOOR'S
LOCK ACTUATOR
UNLOCK
t: 0.5 second AC203009 AC

OPERATING THE DRIVER’S DOOR INSIDE LOCK KNOB

When the door is locked by driver's door inside lock knob, the
UNLOCK ETACS-ECU energizes its door lock relay for 0.5 second to
DRIVER'S DOOR
INSIDE LOCK KNOB activate all the door lock actuators. Then all the doors will be
LOCK
locked.
ON
LOCK RELAY OUTPUT
OFF t

ALL DOOR'S LOCK LOCK

ACTUATOR
UNLOCK
t: 0.5 second AC202980AC

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-89
DOOR UNLOCK FUNCTION
.

OPERATING THE DRIVER’S DOOR LOCK KEY CYLINDER

When you insert the ignition key to the driver’s door lock key
cylinder and turn the key counterclockwise to unlock the door,
DRIVER'S ON
DOOR LOCK (UNLOCK) the ETACS-ECU energizes its door unlock relay for 0.5 second
KEY CYLINDER to activate only the driver’s door lock actuator. Then only the
SWITCH OFF
driver’s door will be unlocked.
When you turn the key counterclockwise again, the ETACS-
ON
UNLOCK RELAY ECU energizes its door unlock relay for 0.5 second to activate
OUTPUT
OFF t t
all the door lock actuator. Then all the doors will be unlocked.

DRIVER'S LOCK
DOOR LOCK
ACTUATOR UNLOCK

PASSESNGER'S LOCK
DOOR LOCK
ACTUATOR UNLOCK

BACK DOOR LOCK

LOCK
ACTUATOR UNLOCK

t: 0.5 second
AC200017AD

OPERATING THE FRONT PASSENGER’S DOOR LOCK KEY

CYLINDER
When you insert the ignition key to the front passenger’s door
FRONT ON(UNLOCK)
PASSENGER'S lock key cylinder and turn the key counterclockwise to unlock
DOOR LOCK KEY
CYLINDER SWITCH OFF the door, the ETACS-ECU energizes its door unlock relay for
0.5 second to activate all the door lock actuators. Then all the
ON
UNLOCK RELAY doors will be unlocked.
OUTPUT
OFF t

ALL DOOR'S LOCK LOCK

ACTUATOR
UNLOCK
t: 0.5 second AC203005AC

OPERATING THE DRIVER’S OR FRONT PASSENGER’S

DOOR LOCK SWITCH
ON(LOCK) When the door is unlocked by driver’s or front passenger's door
DRIVER'S OR
FRONT PASSENGER'S lock switch, the ETACS-ECU energizes its door unlock relay for
OFF
DOOR LOCK 0.5 second to activate all the door lock actuators. Then all the
SWITCH
ON(UNLOCK) doors will be unlocked.
UNLOCK RELAY
ON
OUTPUT
OFF t

ALL DOOR'S LOCK

LOCK
ACTUATOR
UNLOCK
t: 0.5 second AC203006AC

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54B-90 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

FORGOTTEN KEY PREVENTION FUNCTION after approximately 0.3 second. This prevents the
If the driver's door is opened with the ignition key door from being locked unintentionally. If the system
inserted in the ignition key cylinder and then locked fails to unlock the door, the ETACS-ECU try to turn
(i.e., the unlock switch integrated in the driver's door on the unlock relay five times in maximum for 0.5
lock actuator is off, and the lock switch is on), the second every one second.
ETACS-ECU turns on the unlock relay for 0.5 second

(KEY REMOVED)
KEY REMINDER
SWITCH (KEY INSERTED)

DRIVER'S DOOR (OPEN)ON

SWITCH
(CLOSE)OFF

LOCK
DRIVER'S DOOR LOCK
ACTUATOR SWITCH UNLOCK

ON
LOCK RELAY OUTPUT
OFF

ON
UNLOCK RELAY OUTPUT
OFF

t : 0.3 second
AC101499 AE
T1 : 0.5 second
T2 : 1 second

NOTE: The dotted line indicates that the system is

trying to turn on the unlock relay if the door can not
be unlocked.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-91
GENERAL CIRCUIT DIAGRAM FOR THE CENTRAL DOOR LOCKING SYSTEM
JUNCTION BLOCK
ETACS-ECU DOOR LOCK
ACTUATOR
(FRONT: LH)

DOOR LOCK
ACTUATOR
(FRONT: RH)

DOOR LOCK
ACTUATOR
(REAR: LH)

DOOR LOCK
ACTUATOR
(REAR: RH)

BACK
DOOR LOCK
ACTUATOR
POWER WINDOW
MAIN SWITCH

POWER WINDOW
SUB SWITCH
(FRONT: RH)

DOOR LOCK
KEY CYLINDER
SWITCH (LH)

DOOR LOCK
KEY CYLINDER
SWITCH (RH)

FUSIBLE FUSIBLE
DATA LINK LINK 2 LINK 1
CONNECTOR (13-PIN)
DATA LINK
CONNECTOR (16-PIN) RELAY
BOX

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54B-92 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

INSPECTION PROCEDURE C-1: Central Door Locking System: Central door lock system does not
work at all.

NOTE: This troubleshooting procedure requires the

use of scan tool MB991958 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor P.54B-10."
Central Door Lock Power Supply Circuit

FUSIBLE
LINK 2

JUNCTION
BLOCK
ETACS-
ECU

UNLOCK LOCK UNLOCK

RELAY RELAY RELAY

FRONT PASSENGER' S
AND REAR DOOR
LOCK ACTUATOR

DRIVER' S
DOOR LOCK
ACTUATOR

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-93

FUSIBLE LINK (2) CONNECTORS: D-25, D-28

D-28

FUSIBLE LINK

BATTERY D-25
ACX02274 AF AC000758 AK

CONNECTOR: D-222 CONNECTORS: D-209, D-211, D-217

JUNCTION BLOCK (REAR VIEW) JUNCTION BLOCK (FRONT VIEW)

D-209

D-211

ACX02286 AC
D-217 ACX02285 AK

CONNECTOR: H-10
DRIVER'S DOOR

AC203774 AP

• Door lock switch, which is incorporated in the

.

CIRCUIT OPERATION
• The ETACS-ECU controls the central door lock power window main switch or power window
system, locking or unlocking all the doors by acti- sub switch (front RH)
vating the central door lock relay (built into the .

ETACS-ECU). The ETACS-ECU uses inputs from TROUBLESHOOTING HINTS

the following components: • The ETACS-ECU may be defective
• Driver's or passenger's door lock actuator • The wiring harness or connectors may have
switch loose, corroded or damaged terminals, or termi-
• Driver's or passenger's door lock key cylinder nals pushed back in the connector
switch

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54B-94 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
• MB991854: SWS Monitor Harness (For 13-pin)

STEP 1. Use scan tool MB991958 to select "ECU COMM

CHK" on the SWS monitor display.
Check the following ETACS-ECU.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958. Also con-
nect SWS monitor kit MB991862 after turning on scan tool
MB991958.
DATA LINK DATA LINK (1) Connect the special tool. Refer to "How to connect SWS
CONNECTOR CONNECTOR monitor P.54B-7
(13-PIN) (16-PIN)
(2) Connect SWS monitor kit MB991862 to the data link
connector (13-pin).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Operate scan tool MB991958 according to the procedure
below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
MB991911
2. Select "SWS."
MB991806 3. Select "SWS MONITOR."
MB991862
4. Select "ECU COMM CHK".
MB991824 (5) Scan tool MB991958 should show "OK" on the "ECU
COMM CHK" menu for the "ETACS ECU" menu.
Q: Is "OK" displayed on the "ETACS ECU" menu?
YES : Go to Step 2.
NO : Refer to Inspection Procedure A-3 "Communication
with ETACS-ECU is not possible P.54B-41."

MB991827 AC309091AB

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-95

STEP 2. Check the ETACS-ECU connector D-222 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is the ETACS-ECU connector D-222 in good condition?
CONNECTOR : D-222
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that the central door locking system
should now works normally.

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

STEP 3. Check the battery power supply circuit to the

ETACS-ECU. Test at ETACS-ECU connector D-222.
(1) Disconnect ETACS-ECU connector D-222, and measure at
CONNECTOR : D-222
the junction block side.

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

(2) Measure the voltage between terminal 12 and ground.

• The measured value should be approximately 12 volts
(battery positive voltage).
CONNECTOR D-222 Q: Is the measured voltage approximately 12 volts (battery
(JUNCTION BLOCK SIDE) positive voltage)?
20 19 18171615 141312 1110 9 8 7 6 5 4 3 2 1 YES : Go to Step 5.
NO : Go to Step 4.

ACX01570 AB

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54B-96 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 4. Check the wiring harness between the ETACS-

ECU connector D-222 (terminal 12) and fusible link (2).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

FUSIBLE LINK (2)

FUSIBLE LINK

BATTERY
ACX02274 AF

CONNECTOR: D-211 NOTE: Also check junction block connector D-211 and interme-
JUNCTION BLOCK diate connector D-28 for loose, corroded, or damaged termi-
(FRONT VIEW) nals, or terminals pushed back in the connector. If junction
block connector D-211 or intermediate connector D-28 is dam-
D-211(B) aged, repair or replace the damaged component(s) as
described in GROUP 00E, Harness Connector Inspection
HARNESS SIDE P.00E-2.
Q: Is the wiring harness between ETACS-ECU connector D-
222 (terminal 12) and fusible link (2) in good condition?
AC203850AJ
YES : No action is necessary and testing is complete.
CONNECTOR : D-28
NO : The wiring harness may be damaged or the connector
may have loose, corroded or damaged terminals, or
terminals pushed back in the connector. Repair the
wiring harness as necessary. Verify that the central
door locking system should now works normally.

AC400706AF

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-97

STEP 5. Check driver's door lock actuator connector H-10

for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
CONNECTOR: H-10 Q: Is driver's door lock actuator connector H-10 in good
FRONT DOOR <DRIVER'S SIDE> condition?
YES : Go to Step 6.
NO : The wiring harness may be damaged or the
H-10 (B) connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair or replace the damaged component(s). Refer
(HARNESS SIDE) to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that the central door locking system
AC000235 AH
should now works normally.

STEP 6. Check the wiring harness from the ETACS-ECU

connector D-222 (terminal 4) to driver's door lock actuator
connector H-10 (terminal 6).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR: H-10
FRONT DOOR <DRIVER'S SIDE>

H-10 (B)

(HARNESS SIDE)

AC000235 AH

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54B-98 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTOR : D-25 NOTE: Also check intermediate connector D-25 and junction
block connector D-217 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If intermediate
connector D-25 or junction block connector D-217 is damaged,
repair or replace the damaged component(s) as described in
GROUP 00E, Harness Connector InspectionP.00E-2.
Q: Is the wiring harness from the ETACS-ECU connector D-
222 (terminal 4) to driver's door lock actuator connector
H-10 (terminal 6) in good condition?
AC400706 BC YES : Go to Step 7.
NO : The wiring harness may be damaged or the
CONNECTOR : D-217 connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair or replace the damaged component(s). Verify
that the central door locking system should now works
normally.
HARNESS SIDE

AC204173 BV

STEP 7. Check the wiring harness from the ETACS-ECU

connector D-222 (terminal 19) to driver's door lock
actuator connector H-10 (terminal 4).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR: H-10
FRONT DOOR <DRIVER'S SIDE>

H-10 (B)

(HARNESS SIDE)

AC000235 AH

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-99
CONNECTOR : D-25 NOTE: Also check intermediate connector D-25 and junction
block connector D-209 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If intermediate
connector D-25 or junction block connector D-209 is damaged,
repair or replace the damaged component(s) as described in
GROUP 00E, Harness Connector InspectionP.00E-2.
Q: Is the wiring harness from the ETACS-ECU connector D-
222 (terminal 19) to driver's door lock actuator
connector H-10 (terminal 4) in good condition?
AC400706 BC YES : Replace the ETACS-ECU. Verify that the central door
locking system should now works normally.
CONNECTOR : D-209 NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair or replace the damaged component(s). Verify
that the central door locking system should now works
normally.
HARNESS SIDE

AC204173 BW

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54B-100 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

INSPECTION PROCEDURE C-2: Central Door Locking System: Some doors do not lock or unlock.

Central Door Lock Circuit

JUNCTION BLOCK

ETACS-ECU

UNLOCK LOCK UNLOCK

RELAY RELAY RELAY

DOOR LOCK DOOR LOCK BACK

ACTUATOR ACTUATOR DOOR LOCK
(FRONT (FRONT (REAR (REAR ACTUATOR
: LH) : RH) : LH) : RH)

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-101
CONNECTORS: D-15, D-111 CONNECTORS: D-25, D-125

D-125
D-111

D-15 D-25
AC000759 AB AC000758 AI

CONNECTORS: D-209, D-217 CONNECTOR: D-222

JUNCTION BLOCK (FRONT VIEW) JUNCTION BLOCK (REAR VIEW)

D-209

D-217 ACX02285 AL ACX02286 AC

CONNECTORS: F-12, F-23 CONNECTOR: G-10

F-23

F-12

ACX02289AE AC204524 AE

CONNECTOR: H-10 CONNECTOR: H-13

FRONT DOOR <DRIVER'S SIDE> REAR DOOR <LH>

AC000235 AI AC000237AP

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54B-102 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTOR: H-24 CONNECTOR: H-21

FRONT DOOR <RH> REAR DOOR <RH>

H-24(B)

AC400794 AE AC000316 AQ

CONNECTOR: I-05

ACX02293 AB

. .

CIRCUIT OPERATION TECHNICAL DESCRIPTION (COMMENT)

• The ETACS-ECU controls the central door lock If only some doors do not lock or unlock, the harness
system, locking or unlocking all the doors by acti- wiring between the door lock actuator or the ETACS-
vating the central door lock relay (built into the ECU and the door lock actuator may be defective.
ECU). The ETACS-ECU uses inputs from the fol- .

lowing components: TROUBLESHOOTING HINTS

• Driver's or passenger's door lock actuator • The driver’s or front passenger’s door lock actua-
switch tor may be defective
• Driver's or passenger's door lock key cylinder • The ETACS-ECU may be defective
switch • The harness wiring or connectors may have
• Door lock switch, which is incorporated in the loose, corroded or damaged terminals, or termi-
power window main switch or power window nals pushed back in the connector
sub switch (front RH)

DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set

STEP 1. Check which door lock is defective.

Q: Which of the door locks is defective?
Driver's door : Go to Step 2.
Front passenger's door : Go to Step 7.
Rear passenger's door (LH) : Go to Step 12.
Rear passenger's door (RH) : Go to Step 17.
Back door : Go to Step 22.

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-103

STEP 2. Check driver's door lock actuator connector H-10

for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
CONNECTOR: H-10 Q: Is driver's door lock actuator connector H-10 in good
FRONT DOOR <DRIVER'S SIDE> condition?
YES : Go to Step 3.
NO : Repair or check the connector. Refer to GROUP 00E,
H-10 (B) Harness Connector Inspection P.00E-2. After repairs
have been made, verify that all the doors can now be
locked and unlocked normally.
(HARNESS SIDE)

AC000235 AH

STEP 3. Check the driver's door lock actuator.

1. Remove the driver's door lock actuator, and check it. Refer
LOCK to GROUP 42 − Door Handle and Latch P.42-41.
VIEW A UNLOCK 2. Follow the table below to check the driver's door lock actua-
tor for correct operation.
LEVER BATTERY LEVER
POSITION CONNECTION OPERATION

LEVER At the • Connect terminal 4 The lever moves

"LOCK" to the positive from the "LOCK"
A ACX00543 AE position battery terminal position to the
• Connect terminal 6 "UNLOCK" position.
to the negative
battery terminal
At the • Connect terminal 6 The lever moves
"UNLOCK" to the positive from the "UNLOCK"
position battery terminal position to the
• Connect terminal 4 "LOCK" position.
to the negative
battery terminal

Q: Does the driver's door lock actuator work normally?

YES : Go to Step 4.
NO : Replace the driver's door lock actuator. Verify that all
the doors can be locked and unlocked function should
now work normally.

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54B-104 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 4. Check ETACS-ECU connector D-222 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector D-222 in good condition?
CONNECTOR : D-222
YES : Go to Step 5.
NO : Repair or check the connector. Refer to GROUP 00E,
Harness Connector Inspection P.00E-2. After repairs
have been made, verify that all the doors can now be
locked and unlocked normally.

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

STEP 5. Check the harness wiring from ETACS-ECU

connector D-222 (terminal 19) to driver's door lock
actuator connector H-10 (terminal 4).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR: H-10
FRONT DOOR <DRIVER'S SIDE>

H-10 (B)

(HARNESS SIDE)

AC000235 AH

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SYMPTOM PROCEDURES
54B-105
CONNECTOR : D-25 NOTE: Also check junction block connector D-209 and inter-
mediate connector D-25 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If junction
block connector D-209 or intermediate connector D-25 is dam-
aged, repair or replace the damaged component(s) as
described in GROUP 00E, Harness Connector Inspec-
tionP.00E-2.
Q: Is the harness wiring from ETACS-ECU connectors D-
222 (terminal 19) to driver's door lock actuator
AC400706 BC connector H-10 (terminal 4) in good condition?
CONNECTOR: D-209
YES : Go to Step 6.
JUNCTION BLOCK NO : The harness wiring may be damaged or the
(FRONT VIEW) connectors may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the harness wiring as necessary. After repairs
have been made, verify that all the doors can now be
locked and unlocked normally.

AC203850 AO

STEP 6. Check the harness wiring from ETACS-ECU

connector D-222 (terminal 4) to driver's door lock actuator
connector H-10 (terminal 6).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR: H-10
FRONT DOOR <DRIVER'S SIDE>

H-10 (B)

(HARNESS SIDE)

AC000235 AH

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54B-106 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTOR : D-25 NOTE: Also check junction block connector D-217 and inter-
mediate connector D-25 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If junction
block connector D-217 or intermediate connector D-25 is dam-
aged, repair or replace the damaged component(s) as
described in GROUP 00E, Harness Connector Inspec-
tionP.00E-2.
Q: Is the harness wiring from ETACS-ECU connectors D-
222 (terminal 4) to driver's door lock actuator connector
AC400706 BC H-10 (terminal 6) in good condition?
YES : Replace the ETACS-ECU. Verify that all the doors
CONNECTOR: D-217
JUNCTION BLOCK can be locked and unlocked normally.
(FRONT VIEW) NO : The harness wiring may be damaged or the
connectors may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the harness wiring as necessary. After repairs
have been made, verify that all the doors can now be
1 2 3 4 5 6 7
locked and unlocked normally.
8 9 10 11 12 13 14 15

AC203850 AP

STEP 7. Check front passenger’s door lock actuator

connector H-24 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.
CONNECTOR: H-24 Q: Is passenger’s seat door lock actuator connector H-24
FRONT DOOR <RH> in good condition?
YES : Go to Step 8.
NO : Repair or replace the damaged component(s). Refer
H-24 (B)
to GROUP 00E, Harness Connector Inspection
P.00E-2. After repairs have been made, verify that all
the doors can now be locked and unlocked normally.
HARNESS SIDE

AC400794 AF

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-107

STEP 8. Check the front passenger's door lock actuator.

1. Remove the passenger’s door lock actuator, and check it.
UNLOCK Refer to GROUP 42 − Door Handle and Latch P.42-41.
VIEW A LOCK 2. Follow the table below to check the passenger's door lock
actuator for correct operation.
LEVER BATTERY LEVER
POSITION CONNECTION OPERATION
LEVER At the • Connect terminal 6 The lever moves
"LOCK" to the positive from the "LOCK"
A ACX02351 AC position battery terminal position to the
• Connect terminal 4 "UNLOCK" position.
to the negative
battery terminal
At the • Connect terminal 4 The lever moves
"UNLOCK" to the positive from the "UNLOCK"
position battery terminal position to the
• Connect terminal 6 "LOCK" position.
to the negative
battery terminal

Q: Does the front passenger's door lock actuator work

normally?
YES : Go to Step 9.
NO : Replace the front passenger’s door lock actuator.
Verify that all the doors can be locked and unlocked
normally.

STEP 9. Check ETACS-ECU connector D-222 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector D-222 in good condition?
CONNECTOR : D-222
YES : Go to Step 10.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. After repairs have been made, verify that all
the doors can now be locked and unlocked normally.

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

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54B-108 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 10. Check the harness wiring from ETACS-ECU

connector D-222 (terminal 4) to front passenger's door
lock actuator connector H-24 (terminal 4).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR: H-24
FRONT DOOR <RH>

H-24 (B)

HARNESS SIDE

AC400794 AF

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-109
CONNECTOR: D-15 NOTE: Also check junction block connector D-217 and inter-
mediate connector D-15 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If junction
block connector D-217 or intermediate connector D-15 is dam-
aged, repair or replace the damaged component(s) as
described in GROUP 00E, Harness Connector Inspec-
tionP.00E-2.
Q: Is the harness wiring from ETACS-ECU connector D-222
(terminal 4) to front passenger's door lock actuator
connector H-24 (terminal 4) in good condition?
YES : Go to Step 11.
NO : The harness wiring may be damaged or the
connectors may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the harness wiring as necessary. After repairs
have been made, verify that all the doors can now be
locked and unlocked normally.

AC203860AD

CONNECTOR: D-217
JUNCTION BLOCK
(FRONT VIEW)

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

AC203850 AP

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54B-110 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 11. Check the harness wiring from ETACS-ECU

connector D-222 (terminal 17) to front passenger's door
lock actuator connector H-24 (terminal 6).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR: H-24
FRONT DOOR <RH>

H-24 (B)

HARNESS SIDE

AC400794 AF

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-111
CONNECTOR: D-15 NOTE: Also check junction block connector D-217 and inter-
mediate connector D-15 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If junction
block connector D-217 or intermediate connector D-15 is dam-
aged, repair or replace the damaged component(s) as
described in GROUP 00E, Harness Connector Inspec-
tionP.00E-2.
Q: Is the harness wiring from ETACS-ECU connector D-222
(terminal 17) to front passenger's door lock actuator
connector H-24 (terminal 6) in good condition?
YES : Replace the ETACS-ECU. Verify that all the doors
can be locked and unlocked normally.
NO : The harness wiring may be damaged or the
connectors may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the harness wiring as necessary. After repairs
have been made, verify that all the doors can now be
locked and unlocked normally.

AC203860AD

CONNECTOR: D-217
JUNCTION BLOCK
(FRONT VIEW)

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

AC203850 AP

STEP 12. Check rear passenger's door lock actuator (LH)

connector H-13 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.
CONNECTOR: H-13 Q: Is rear passenger's door lock actuator (LH) connector H-
REAR DOOR <LH> 13 in good condition?
H-13 (B) YES : Go to Step 13.
NO : Repair or check the connector. Refer to GROUP 00E,
Harness Connector Inspection P.00E-2. After repairs
have been made, verify that all the doors can now be
locked and unlocked normally.
(HARNESS SIDE)

AC000237AQ

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54B-112 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 13. Check the rear passenger's door lock actuator

(LH).
1. Remove the rear passenger's door lock actuator (LH), and
LOCK check it. Refer to GROUP 42 − Door Handle and Latch
VIEW A UNLOCK P.42-41.
2. Follow the table below to check the rear passenger's door
lock actuator (LH) for correct operation.
LEVER BATTERY LEVER
POSITION CONNECTION OPERATION
LEVER
At the • Connect terminal 2 to The lever moves
A ACX00543 AE "LOCK" the positive battery from the "LOCK"
position terminal position to the
• Connect terminal 3 to "UNLOCK" position.
the negative battery
terminal
At the • Connect terminal 3 to The lever moves
"UNLOCK" the positive battery from the "UNLOCK"
position terminal position to the
• Connect terminal 2 to "LOCK" position.
the negative battery
terminal

Q: Does the rear passenger's door lock actuator (LH) work

normally?
YES : Go to Step 14.
NO : Replace the rear passenger's door lock actuator (LH).
Verify that all the doors can be locked and unlocked
normally.

STEP 14. Check ETACS-ECU connector D-222 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector D-222 in good condition?
CONNECTOR : D-222
YES : Go to Step 15.
NO : Repair or check the connector. Refer to GROUP 00E,
Harness Connector Inspection P.00E-2. After repairs
have been made, verify that all the doors can now be
locked and unlocked normally.

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-113

STEP 15. Check the harness wiring from ETACS-ECU

connector D-222 (terminal 4) to rear passenger's door lock
actuator (LH) connector H-13 (terminal 4).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR: H-13
REAR DOOR <LH>

H-13 (B)

(HARNESS SIDE)

AC000237AQ

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54B-114 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTOR : D-125
NOTE: Also check junction block connector D-217 and inter-
mediate connector D-125 and F-12 for loose, corroded, or
damaged terminals, or terminals pushed back in the connector.
If junction block connector D-217, intermediate connector D-
125 or F-12 is damaged, repair or replace the damaged com-
ponent(s) as described in GROUP 00E, Harness Connector
Inspection P.00E-2.
Q: Is the harness wiring from ETACS-ECU connectors D-
222 (terminal 4) to rear passenger's door lock actuator
AC400706BA (LH) connector H-13 (terminal 4) in good condition?
YES : Go to Step 16.
CONNECTOR: D-217
JUNCTION BLOCK NO : The harness wiring may be damaged or the
(FRONT VIEW) connectors may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the harness wiring as necessary. After repairs
have been made, verify that all the doors can now be
locked and unlocked normally.
1 2 3 4 5 6 7
8 9 10 11 12 13 14 15

AC203850 AP

CONNECTOR: F-12

AC204484 AH

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-115

STEP 16. Check the harness wiring from ETACS-ECU

connector D-222 (terminal 17) to rear passenger's door
lock actuator (LH) connector H-13 (terminal 6).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR: H-13
REAR DOOR <LH>

H-13 (B)

(HARNESS SIDE)

AC000237AQ

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54B-116 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTOR : D-125
NOTE: Also check junction block connector D-217 and inter-
mediate connectors D-125 and F-12 for loose, corroded, or
damaged terminals, or terminals pushed back in the connector.
If junction block connector D-217 or intermediate connector D-
125 or F-12 is damaged, repair or replace the damaged com-
ponent(s) as described in GROUP 00E, Harness Connector
InspectionP.00E-2.
Q: Is the harness wiring from ETACS-ECU connectors D-
222 (terminal 17) to rear passenger's door lock actuator
AC400706BA (LH) connector H-13 (terminal 6) in good condition?
YES : Replace the ETACS-ECU. Verify that all the doors
CONNECTOR: D-217
JUNCTION BLOCK can be locked and unlocked normally.
(FRONT VIEW) NO : The harness wiring may be damaged or the
connectors may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the harness wiring as necessary. After repairs
have been made, verify that all the doors can now be
1 2 3 4 5 6 7
locked and unlocked normally.
8 9 10 11 12 13 14 15

AC203850 AP

CONNECTOR: F-12

AC204484 AH

STEP 17. Check rear passenger’s door lock actuator (RH)

connector H-21 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.
CONNECTOR: H-21 Q: Is rear passenger’s seat door lock actuator (RH)
REAR DOOR <RH> connector H-21 in good condition?
YES : Go to Step 18.
H-21 (B) NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. After repairs have been made, verify that all
the doors can now be locked and unlocked normally.
HARNESS SIDE

AC000316 AS

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-117

STEP 18. Check the rear passenger's door lock actuator

(RH).
1. Remove the rear passenger’s door lock actuator (RH), and
UNLOCK check it. Refer to GROUP 42 − Door Handle and Latch
LOCK P.42-41.
VIEW A
2. Follow the table below to check the rear passenger's door
1 2 3 lock actuator (RH) for correct operation.
4 5 6
LEVER BATTERY LEVER
LEVER POSITION CONNECTION OPERATION
At the • Connect terminal 3 The lever moves
A AC201170 AB "LOCK" to the positive from the "LOCK"
position battery terminal position to the
• Connect terminal 2 "UNLOCK" position.
to the negative
battery terminal
At the • Connect terminal 2 The lever moves
"UNLOCK" to the positive from the "UNLOCK"
position battery terminal position to the
• Connect terminal 3 "LOCK" position.
to the negative
battery terminal

Q: Is the rear passenger's seat door lock actuator (RH)

normal?
YES : Go to Step 19.
NO : Replace the rear passenger’s seat door lock actuator
(RH). Verify that all the doors can be locked and
unlocked normally.

STEP 19. Check ETACS-ECU connector D-222 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector D-222 in good condition?
CONNECTOR : D-222
YES : Go to Step 20.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. After repairs have been made, verify that all
the doors can now be locked and unlocked normally.

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

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54B-118 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 20. Check the harness wiring from ETACS-ECU

connector D-222 (terminal 4) to rear passenger's door lock
actuator (RH) connector H-21 (terminal 6).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR: H-21
REAR DOOR <RH>

H-21 (B)

HARNESS SIDE

AC000316 AS

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-119
CONNECTOR : D-111 NOTE: Also check junction block connector D-209 and inter-
mediate connector D-111 and F-23 for loose, corroded, or dam-
aged terminals, or terminals pushed back in the connector. If
junction block connector D-209 or intermediate connector D-
111 or F-23 are damaged, repair or replace the damaged com-
ponent(s) as described in GROUP 00E, Harness Connector
Inspection P.00E-2.
Q: Is the harness wiring from ETACS-ECU connector D-222
(terminal 4) to rear passenger's door lock actuator (RH)
AC400710 AG connector H-21 (terminal 6) in good condition?
CONNECTOR: D-209
YES : Go to Step 21.
JUNCTION BLOCK NO : The harness wiring may be damaged or the
(FRONT VIEW) connectors may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the harness wiring as necessary. After repairs
have been made, verify that all the doors can now be
locked and unlocked normally.

AC203850 AO

CONNECTOR: F-23

AC204484 AJ

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54B-120 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 21. Check the harness wiring from ETACS-ECU

connector D-222 (terminal 17) to rear passenger's door
lock actuator (RH) connector H-21 (terminal 4).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR: H-21
REAR DOOR <RH>

H-21 (B)

HARNESS SIDE

AC000316 AS

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-121
CONNECTOR : D-111 NOTE: Also check junction block connector D-209 and inter-
mediate connector D-111 and F-23 for loose, corroded, or dam-
aged terminals, or terminals pushed back in the connector. If
junction block connector D-209 or intermediate connector D-
111 or F-23 are damaged, repair or replace the damaged com-
ponent(s) as described in GROUP 00E, Harness Connector
Inspection P.00E-2.
Q: Is the harness wiring from ETACS-ECU connector D-222
(terminal 17) to rear passenger's door lock actuator (RH)
AC400710 AG connector H-21 (terminal 4) in good condition?
CONNECTOR: D-209
YES : Replace the ETACS-ECU. Verify that all the doors
JUNCTION BLOCK can be locked and unlocked normally.
(FRONT VIEW) NO : The harness wiring may be damaged or the
connectors may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the harness wiring as necessary. After repairs
have been made, verify that all the doors can now be
locked and unlocked normally.

AC203850 AO

CONNECTOR: F-23

AC204484 AJ

STEP 22. Check back door lock actuator connector I-05 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
CONNECTOR: I-05 Q: Is back door lock actuator connector I-05 in good
condition?
YES : Go to Step 23.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
HARNESS SIDE I-05 (B) P.00E-2. Verify that all the doors (including the back
door) can be locked and unlocked normally.

ACX02293 BA

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54B-122 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 23. Check the back door lock actuator.

1. Remove the back door lock actuator, and check it. Refer to
GROUP 42 − Back door Handle and Latch P.42-54.
LEVER 2. Follow the table below to check the back door lock actuator
for correct operation.
A
LEVER BATTERY LEVER
VIEW A POSITION CONNECTION OPERATION
UN At the • Connect terminal 3 The lever moves
LOCK
LOCK "LOCK" to the positive from the "LOCK"
AC103292 AC position battery terminal position to the
• Connect terminal 2 "UNLOCK" position.
to the negative
battery terminal
At the • Connect terminal 2 The lever moves
"UNLOCK" to the positive from the "UNLOCK"
position battery terminal position to the
• Connect terminal 3 "LOCK" position.
to the negative
battery terminal

Q: Is the back door lock actuator normal?

YES : Go to Step 24.
NO : Replace the back door lock actuator. Verify that all the
doors (including the back door) can be locked and
unlocked normally.

STEP 24. Check ETACS-ECU connector D-222 for loose,

corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector D-222 in good condition?
CONNECTOR : D-222
YES : Go to Step 25.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that all the doors (including the back
door) can be locked and unlocked normally.

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-123

STEP 25. Check the harness wiring from ETACS-ECU

connector D-222 (terminal 17) to back door lock actuator
connector I-05 (terminal 4).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR: I-05

HARNESS SIDE I-05 (B)

ACX02293 BA

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54B-124 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTOR : D-111 NOTE: Also check junction block connector D-209 and inter-
mediate connector D-111 and G-10 for loose, corroded, or
damaged terminals, or terminals pushed back in the connector.
If junction block connector D-209 or intermediate connector D-
111 or G-10 is damaged, repair or replace the damaged com-
ponent(s) as described in GROUP 00E, Harness Connector
Inspection P.00E-2.
Q: Is the harness wiring from ETACS-ECU connector D-222
(terminal 17) to back door lock actuator connector I-05
AC400710 AG (terminal 4) in good condition?
CONNECTOR: D-209
YES : Go to Step 26.
JUNCTION BLOCK NO : The harness wiring may be damaged or the
(FRONT VIEW) connectors may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the harness wiring as necessary. Verify that all
the doors (including the back door) can be locked and
unlocked normally.

AC203850 AO

CONNECTOR: G-10

G-10

AC204524 AF

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-125

STEP 26. Check the harness wiring from ETACS-ECU

connector D-222 (terminal 4) to back door lock actuator
connector I-05 (terminal 6).
CONNECTOR : D-222

JUNCTION BLOCK SIDE

20 19 18 17 16 15 14 13 121110 9 8 7 6 5 4 3 2 1

AC204174 AJ

CONNECTOR: I-05

HARNESS SIDE I-05 (B)

ACX02293 BA

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54B-126 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

CONNECTOR : D-111 NOTE: Also check junction block connector D-209 and inter-
mediate connector D-111 and G-10 for loose, corroded, or
damaged terminals, or terminals pushed back in the connector.
If junction block connector D-209 or intermediate connector D-
111 or G-10 is damaged, repair or replace the damaged com-
ponent(s) as described in GROUP 00E, Harness Connector
Inspection P.00E-2.
Q: Is the harness wiring from ETACS-ECU connector D-222
(terminal 4) to back door lock actuator connector I-05
AC400710 AG (terminal 6) in good condition?
CONNECTOR: D-209
YES : Replace the ETACS-ECU. Verify that all the doors
JUNCTION BLOCK (including the back door) can be locked and unlocked
(FRONT VIEW) normally.
NO : The harness wiring may be damaged or the
connectors may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the harness wiring as necessary. Verify that all
the doors (including the back door) can be locked and
unlocked normally.
AC203850 AO

CONNECTOR: G-10

G-10

AC204524 AF

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-127

INSPECTION PROCEDURE C-3: Central Door Locking System: All the doors do not lock or unlock
with just the door lock switch operation.

Central Door Lock (Door Lock Switch) Circuit

• The ETACS-ECU may be defective

.

TECHNICAL DESCRIPTION (COMMENT)

The door lock switch (built into the power window • The wiring harness or connectors may have
switch) or the ETACS-ECU may be defective. loose, corroded or damaged terminals, or termi-
nals pushed back in the connector
.

TROUBLESHOOTING HINTS
• The power window switch (door lock switch) may
be defective

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54B-128 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B

Check the input signal (by using the pulse check mode of
the monitor.)
Check the input signals from the door lock switch:
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991502 to the data link connector
DATA LINK
CONNECTOR (16-pin).
(2) Operate scan tool MB991958 as follows:
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."
(3) Move the driver's or the front passenger's door lock switch
from "LOCK" to "UNLOCK" or vice versa.
MB991911 (4) Check scan tool MB991958 sounds or not.
Q: Does scan tool MB991958 sound when operating the
door lock switches as described?
MB991824
YES : Replace the ETACS-ECU. Verify that all the doors
can now be locked and unlocked by the door lock
switch.
NO : Refer to Inspection Procedure P-7 "ETACS-ECU does
not receive any signal from the door lock switch
(incorporated in the power window main switch)
P.54B-589."
MB991827 AC307591 AB

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-129

INSPECTION PROCEDURE C-4: Central Door Locking System: All the doors do not lock or unlock
with just the door lock key cylinder key operation.

Central Door Lock (Door Lock Key Cylinder Switch) Circuit

TROUBLESHOOTING HINTS
.

TECHNICAL DESCRIPTION (COMMENT)

The door lock switch (built into the power window • The door lock key cylinder switch may be defec-
switch) or the ETACS-ECU may be defective. tive
• The ETACS-ECU may be defective
.
• The wiring harness or connectors may have
loose, corroded or damaged terminals, or termi-
nals pushed back in the connector

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54B-130 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B

Check the input signal (by using the pulse check mode of
the monitor.)
Check the input signals from the door lock key cylinder switch.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991502 to the data link connector
DATA LINK
CONNECTOR (16-pin).
(2) Operate scan tool MB991958 as follows:
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."
(3) Use the driver's or passenger's door lock key cylinder to
lock and unlock the doors.
MB991911 (4) Check that scan tool MB991958 sounds.
Q: Does scan tool MB991958 sound when operating the
door locks as described?
MB991824
YES : Replace the ETACS-ECU. Verify that all the doors
can now be locked and unlocked by using each door
lock key cylinder switch.
NO : Refer to Inspection Procedure P-5 "ETACS-ECU does
not receive any signal from the driver's, front
passenger's or back door lock key cylinder switch
P.54B-557."
MB991827 AC307591 AB

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-131

INSPECTION PROCEDURE C-5: Central Door Locking System: All the doors do not lock with just the
driver's inside lock knob operation.

Central Door Lock (Door Lock Actuator Switch) Circuit

TROUBLESHOOTING HINTS
.

TECHNICAL DESCRIPTION
The driver's door lock actuator switch or the ETACS- • The driver's door lock actuator switch may be
ECU may be defective. defective
• The ETACS-ECU may be defective
.
• The wiring harness or connectors may have
loose, corroded or damaged terminals, or termi-
nals pushed back in the connector

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54B-132 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B

Check the input signal (by using the pulse check mode of
the monitor.)
Check the input signals from the driver's door lock actuator
switch.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991502 to the data link connector
DATA LINK
CONNECTOR (16-pin).
(2) Operate scan tool MB991958 as follows:
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."
(3) Lock or unlock the driver's inside lock knob.
(4) Check scan tool MB991958 sounds or not.
MB991911
Q: Does scan tool MB991958 sound when the driver's
inside lock knob is locked or unlocked, or the
passenger's side lock knob is moved from the lock to
MB991824
the unlock position?
YES : Replace the ETACS-ECU. Verify that all the doors
can be locked or unlocked by operating the driver's
inside lock knob.
NO : Refer to Inspection Procedure P-6 "ETACS-ECU does
not receive any signal from the driver's, front
passenger's or back door lock actuator switch P.54B-
MB991827 AC307591 AB
574."

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-133

INSPECTION PROCEDURE C-6: Central Door Locking System: Forgotten key prevention function
does not work normally.

NOTE: This troubleshooting procedure requires the

use of scan tool MB991958 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor P.54B-10."
Forgotten Key Prevention Circuit

TECHNICAL DESCRIPTION (COMMENT)

.

CIRCUIT OPERATION
The ETACS-ECU operates the forgotten key preven- If the forgotten key prevention function does not
tion function according to the following switches: work normally, the input circuit from the switches or
• Key reminder switch: OFF the ETACS-ECU may be defective.
• Driver's or front passenger's door switch: ON .

• Driver's door lock actuator switch: being turned TROUBLESHOOTING HINTS

ON • The key reminder switch may be defective
The ETACS-ECU activates the forgotten key preven- • The driver's or front passenger's door switch may
tion function under the following conditions: be defective
• Ignition key: inserted into the ignition key cylinder • The driver's door lock actuator switch may be
• Driver's or front passenger's door: open defective
• Driver’s or front passenger’s door lock: being • The ETACS-ECU may be defective
locked electrically • The wiring harness or connectors may have
• Driver’s door lock: being locked manually loose, corroded or damaged terminals, or termi-
nals pushed back in the connector
.

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54B-134 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991813: SWS Monitor Kit
• MB991806: SWS Monitor Cartridge
• MB991812: SWS Monitor Harness (For Column-ECU)
• MB991822: Probe Harness
• MB991854: SWS Monitor Harness (For 13-pin)

STEP 1. Use scan tool MB991958 to select "ECU COMM

CHK" on the SWS monitor display.
Check the ETACS-ECU.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
DATA LINK DATA LINK (1) Connect the special tool. Refer to "How to connect SWS
CONNECTOR CONNECTOR monitor P.54B-7
(13-PIN) (16-PIN)
(2) Connect the SWS monitor kit MB991862 to the data link
connector (13-pin).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Operate scan tool MB991958 as follows:
1. Select "SYSTEM SELECT."
MB991911 2. Select "SWS."
3. Select "SWS MONITOR."
MB991806 4. Select "ECU COMM CHK".
MB991862
(5) Check scan tool MB991958 should show "OK" on the
MB991824 "ETACS ECU" menu.
Q: Is "OK" displayed on the "ETACS ECU" menu?
YES : Go to Step 2.
NO : Refer to Inspection Procedure A-3 "Communication
with ETACS-ECU is not possible P.54B-41."

MB991827 AC309091AB

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 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES
54B-135

STEP 2. Check the input signal by using "DATA LIST"

menu of the SWS monitor.
DATA LINK DATA LINK Check the input signals from the following switches:
CONNECTOR CONNECTOR • Driver’s door: open
(13-PIN) (16-PIN)
• Front passenger’s door: close
(1) Operate scan tool MB991958 as follows:
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
MB991911 4. Select "DATA LIST."
5. Select "ETACS ECU."
MB991862
MB991806 (2) Check that normal conditions are displayed on the items
described in the table below.
MB991824
ITEM NO. ITEM NAME NORMAL
CONDITION
ITEM 32 FRONT DOOR SW ON

Q: The scan tool show the respective normal condition for

item "FRONT DOOR SW."
MB991827 YES : Go to Step 3.
AC309091AB
NO : Refer to Inspection Procedure O-5 "ETACS-ECU
does not receive any signal from the driver's or the
front passenger's door switch P.54B-509."

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54B-136 SIMPLIFIED WIRING SYSTEM (SWS)
SYMPTOM PROCEDURES

STEP 3. Check the input signal (by using the pulse check
mode of the monitor.)
Check the input signals from the following switches:
DATA LINK
CONNECTOR • Key reminder switch
• Driver's door lock actuator switch
(1) Operate scan tool MB991958 as follows:
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."
(2) If the switches (see table below), which are applicable for
MB991911 the input signal check, are operated, verify if scan tool
MB991958 sounds or not.

MB991824
ITEM NAME CHECK CONDITIONS
Key reminder switch Remove
Driver's door lock actuator Turn on and off the driver's
switch door lock actuator switch.

Q: Does scan tool MB991958 sound whenever the key

reminder switch and the driver’s door lock actuator
MB991827 AC307591 AB
switch are operated?
Buzzer of scan tool MB991958 sounds normally :
Replace the ETACS-ECU. Verify that the forgotten
key prevention function works normally.
Scan tool MB991958 does not sound when the ignition
key is removed and reinserted : Refer to Inspection
Procedure P-1 "ETACS-ECU does not receive a
signal from the key reminder switch P.54B-532."
Scan tool MB991958 does not sound when the driver’s
door lock actuator switch is operated : Refer to
Inspection Procedure P-6 "ETACS-ECU does not
receive any signal from the driver's, front passenger's
or back door lock actuator switch P.54B-574."

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