EWD(Electrical Wiring Diagram)

Chapter Outline
This chapter explains an EWD(Electrical Wiring Diagram).
• Description
• Introduction to using EWD

Let’s study the

EWD.
Click the "Next" button.
Description Description
In order to understand the system circuit diagram and be
able to detect trouble, you must know where the compo-
nents are installed in the vehicle and how they are con-
nected.
The EWD is prepared for each vehicle model.
The drawing that shows all of this is called the EWD
(Electrical Wiring Diagram).
(1/1)

EWD Contents
The EWD is as shown at left.
COROLLA
(1/1)
ELECTRICAL WIRING DIAGRAM
Section Code Page
INTRODUCTION A 2

HOW TO USE THIS MANUAL B 3

TROUBLESHOOTING C 12

ABBREVIATIONS D 17

GLOSSARY OF TERMS AND SYMBOLS E 18

RELAY LOCATIONS F 20

ELECTRICAL WIRING ROUTING G 34

SYSTEM CIRCUITS H 91

GROUND POINT I 294

POWER SOURCE (Current Flow Chart) J 302

CONNECTOR LIST K 308

PART NUMBER OF CONNECTORS L 320

OVERALL ELECTRICAL WIRING DIAGRAM M 324

-1-
 Abbreviations
ABBREVIATIONS D Abbreviations are used for components,
ABBREVIATIONS etc., that are often used in the EWD.
The following abbreviations are used in this manual. A list of these abbreviations is given in
A/C
A/T
=
=
Air Conditioner
Automatic Transaxle
the "ABBREVIATIONS" section.
ABS = Anti-Lock Brake System When using an EWD, refer to this sec-
COMB. = Combination
DLC3 = Data Link Connector 3 tion to look up the terms thought to be
ECT = Electronic Control Transmission
ECU = Electronic Control Unit abbreviations.
EFI
EMPS
=
=
Electronic Fuel Injection
Electric Motor Power Steering (1/1)
ESA = Electronic Spark Advance
EVAP = Evaporative Emission
G.C.C. = Gulf Cooperation Council
H/B = Hatchback Type
ISC = Idle Speed Control
J/B = Junction Block
LED = Light Emitting Diode
LH = Left-Hand
LHD = Left-Hand Drive
M/T = Manual Transaxle
O/D = Overdrive
R/B = Relay Block
RH = Right-Hand
RHD = Right-Hand Drive
S/D = Sedan Type
SRS = Supplemental Restraint System
SW = Switch
TEMP. = Temperature
TVSS = TOYOTA Vehicle Security System
VSV = Vacuum Switching Valve
VVT- i = Variable Valve Timing-intelligent
W/G = Wagon Type
w/ = With
w/o = Without

Glossary of Terms and Symbols

E GLOSSARY OF TERMS AND SYMBOLS
BATTERY GROUND FUSE RESISTOR, TAPPED SWITCH, IGNITION An EWD uses symbols to express vari-
ous components, such as battery and
(for Medium Current Fuse)
semiconductors.
CAPASITOR HORN RESISTOR,
(Condenser) FUSIBLE LINK VARIABLE or RHEOSTAT These symbols are listed in the "GLOS-
SARY OF TERMS AND SYMBOLS"
CIGARETTE LIGHTER IGNITION COIL
(for High Current Fuse or
Fusible link) SENSOR (Thermistor) SWITCH, WIPER PARK
section.
HEADLIGHTS (1/1)

CIRCUIT BREAKER 1. SINGLE FILAMENT SENSOR, SPEED TRANSISTOR

LIGHT

(Reed Switch Type)

2. DOUBLE FILAMENT
DIODE RELAY SHORT PIN WIRES
LED (LIGHT EMITTING
DIODE) (1) NOT
1. NORMALLY
CONNECTED
CLOSED

DIODE, ZENER SOLENOID

MOTOR
2. NORMALLY (2) SPLICED
M OPEN

PHOTODIODE RELAY, DOUBLE THROW SPEAKER SWITCH, MANUAL

METER, ANALOG
1. NORMALLY
CLOSED

DISTRIBUTOR, IIA METER, DIGITAL RESISTOR SWITCH, DOUBLE THROW

2. NORMALLY
FUEL
OPEN

-2-
Introduction to using EWD System Circuits
The contents page lists all systems in alphabetical order.
SYSTEM CIRCUITS H An explanation of each system circuit item will be given
COROLLA starting on the next page.
ELECTRICAL WIRING DIAGRAM (1/2)
SYSTEM CIRCUITS page
ABS 228
AIR CONDITIONER (AUTOMATIC A/C) 276
AIR CONDITIONER (MANUAL A/C) 282
BACK-UP LIGHT 162
CHARGING 100
CIGARETTE LIGHTER 168
CLOCK 170
COMBINATION METER 260
CONDENSER FAN (EXCEPT 2C) 268
CONDENSER FAN (2C) 272
COOLER 288
DOOR LOCK CONTROL (LHD) 180
DOOR LOCK CONTROL (RHD) 186
ECT AND A/T INDICATOR (1NZ-FE,2NZ-FE) 220
ECT AND A/T INDICATOR (1ZZ-FE,3ZZ-FE) 214
EMPS 238
ENGINE CONTOROL (1NZ-FE,2NZ-FE) 114
ENGINE CONTOROL (1ZZ-FE,3ZZ-FE) 102
ENGINE IMMOBILIZER SYSTEM 130
FRONT FOG LIGHT 138
FRONT WIPER AND WASHER 172
GLOW PLUG (2C) 126
HEADLIGHT (AUSTRALIA) 136
HEADLIGHT (EXCEPT AUSTRALIA) 134
HEATER 292
HORN 240
ILLUMINATION 146
INTERIOR LIGHT 140
KEY REMINDER 164
LIGHT REMINDER BUZZER 164
MOON ROOF 248
POWER SOURCE 92
POWER WINDOW 206
RADIATOR FAN (EXCEPT 2C) 268
RADIATOR FAN (2C) 272
RADIO AND PLAYER 252
REAR WINDOW DEFOGGER 256
REAR WIPER AND WASHER 176
REMOTE CONTROL MIRROR 250
SEAT BELT WARNING 242
SHIFT LOCK 246
SRS 233
STARTING AND IGNITION 96
STOP LIGHT 158
TAILLIGHT 154
TURN SIGNAL AND HAZARD WARNING LIGHT 150
TVSS (AUSTRALIA) 210
WIRELESS DOOR LOCK CONTROL (LHD) 192
WIRELESS DOOR LOCK CONTROL (RHD) 198

91

In the "SYSTEM CIRCUITS" section, the drawings show

1 1 1
the relationship between all of the electrical parts, wire
10A
HEAD LH
10A
HEAD RH
15A
DOME
harnesses, connectors, relays, etc., from the power sup-
2 2 2 ply to the ground point for each system.
Each connector and pin is given a code and number.
1 2H 1 1 1
L-Y
R-B

R-B

R-L

R-L

Searching for the code and number during troubleshoot-

B

HEADLIGHT

HEADLIGHT

HEADLIGHT

HEADLIGHT

4 2H
RH(HIGH)

1 2 1 2
LH(HIGH)

RH(LOW)
LH(LOW)

ing will allow you to find the connector and pin position.
H12

H13

H14

H11

2 1 2 1 4 2P

(2/2)
SB(L-Y)

CONNECTOR

23
JUNCTION

R-G
54
J3
R-G

R-Y

SB(L-Y)

R-Y

14
COMBINATION METER

8 2H 9 2H 14 2H 12 2H
HIGH BEAM

4 2F 10 2F 10 2N
C7
R-G

13
R-Y

W(R-G)

9 11
CONTROL SW

OFF LOW
DIMMER SW

TAIL HIGH
B

LIGHT

HEAD FLASH

FL MAIN
2.0L
C8 10
COMBINATION SW

BATTERY
W-B

A
J2
JUNCTION
CONNECTOR

IE

-3-
 Parts
1 1 1
The highlighted areas show the parts.
The parts are shown with a sky blue.
10A 10A 15A
HEAD LH HEAD RH DOME

(1/6)
2 2 2

1 2H 1 1 1

L-Y
R-B

R-B

R-L

R-L
B

HEADLIGHT

HEADLIGHT

HEADLIGHT

HEADLIGHT
4 2H

RH(HIGH)
1 2 1 2

LH(HIGH)

RH(LOW)
LH(LOW)
H12

H13

H14

H11
2 1 2 1 4 2P

SB(L-Y)

CONNECTOR
23

JUNCTION
R-G
54

J3
R-G

R-Y

SB(L-Y)
R-Y

14

COMBINATION METER
8 2H 9 2H 14 2H 12 2H

HIGH BEAM
4 2F 10 2F 10 2N

C7
R-G

13

R-Y W(R-G)

9 11
CONTROL SW

OFF LOW
DIMMER SW

TAIL HIGH
B

LIGHT

HEAD FLASH

FL MAIN
2.0L
C8 10
COMBINATION SW

BATTERY
W-B

A
J2
JUNCTION
CONNECTOR

IE

"C8" shows the connector code, and

"COMBINATION SW" shows the part
9 11
name.
(2/6)

OFF LOW
CONTROL SW

DIMMER SW

TAIL HIGH
LIGHT

HEAD FLASH

C8 10
COMBINATION SW
W-B

-4-
 These numbers (9, 10, 11) show the
connector pin numbers.
9 11
(3/6)

OFF LOW
CONTROL SW

DIMMER SW
TAIL HIGH
LIGHT

HEAD FLASH

C8 10
COMBINATION SW

W-B

1. How to read the connector pin

number
Pins consist of male pins that are
inserted and female pins in which the
male pins are inserted. Connectors
with male pins are called male con-
Locking portion
nectors, and connectors with female
pins are called female connectors.
Connectors have locks to ensure the
connectors are securely connected.
(4/6)

Female Male
connector connector ( )
Female pin Male pin

-5-
 The connector's locking portion is ori-
ented facing up so that when reading the
pin numbers on the connection surface,
the numbers are read from top left for
the female connector as shown in the
left in the illustration.
For the male connector, the numbers are
read from top right like the mirror image
of the female connector as shown in the
right in the illustration.
(5/6)

Up Up

1 2 3 3 2 1
4 5 6 7 8 8 7 6 5 4

Female connector Male connector

When using a tester to check the volt-

age, use a probe as shown in the figure
to check the voltage.
However, at this time the pin number is
read from the back of the connector.
Therefore, this is the reverse of when
reading from the connecting surface, so
be careful when reading the pin num-
bers.
(6/6)

1 2 3
4 5 6 7 8

Male connector

-6-
 Juncton Connector
1 1 1
The highlighted areas show the junction connectors.
(1/3)
10A 10A 15A
HEAD LH HEAD RH DOME

2 2 2

1 2H 1 1 1

L-Y
R-B

R-B

R-L

R-L
B

HEADLIGHT

HEADLIGHT

HEADLIGHT

HEADLIGHT
4 2H

RH(HIGH)
1 2 1 2

LH(HIGH)

RH(LOW)
LH(LOW)
H12

H13

H14

H11
2 1 2 1 4 2P

SB(L-Y)

CONNECTOR
23

JUNCTION
R-G
54

J3
R-G

R-Y

SB(L-Y)
R-Y

14

COMBINATION METER
8 2H 9 2H 14 2H 12 2H

HIGH BEAM
4 2F 10 2F 10 2N

C7
R-G

13

R-Y W(R-G)

9 11
CONTROL SW

OFF LOW
DIMMER SW

TAIL HIGH
B

LIGHT

HEAD FLASH

FL MAIN
2.0L
C8 10
COMBINATION SW

BATTERY
W-B

A
J2
JUNCTION
CONNECTOR

IE

The junction connectors bundle multiple

wires into a wire harness.
"J2" shows the junction connector code,

A
and "JUNCTION CONNECTOR" shows
that this part is a junction connector.
(2/3)

J2
JUNCTION
CONNECTOR

-7-
 1. Junction connector construction
As shown in the figure, the junction
connector construction consists of
short terminals to which multiple wire
Junction connector harnesses of the same color are con-
nected.
(3/3)

Same color

Short terminal

Junction Block and Relay Block

The highlighted area shows the junction
Junction block
W-R block. The junction block has the func-
1
tion of grouping and connecting electri-
W-R

1 IB1 (LHD)

cal circuits inside the block and

1 IG3 (RHD) P8
10A 30A 25 POWER WINDOW MASTER SW 7
GAUGE POWER P/W

2 combining relays, fuses, circuit break-

3 2G
ers, etc., to circuit boards.
W(W-R)

(*1) Some parts of the junction block do not

contain relays, fuses, etc., but only
1 5 W-R
(*2)
P/W
RELAY
serves as a connector.
2 3
The relay block has a construction
B E E SGND PLS LMT DU DD
2 2G 9 2G 2 2K 10 2G 8 2G 6 3 1 2 14 17 4 nearly identical to that of the junction
block, but it does not group and connect
electrical circuits inside the block.
Relay block The EWD is divided and expressed as
follows. Junction block: gray background
B-W

1 1 Relay block: colorless background

5 1

EFI
RELAY

3 2

1 1

-8-
 1. Junction block number and con-
nector code
The number in the ellipse (2) shows
the junction block number, and the
2G letter (G) shows the connector code.

1 5

P/W
RELAY

2 3

2 2G 9 2G 2 2K 10 2G

2. Connector pin number

These numbers (2, 9) show the con-
2G nector pin numbers.

2
9
1 5

P/W
RELAY

2 3

2 2G 9 2G 2 2K 10 2G

-9-
 3. Pin number
These numbers (1, 2, 3, 5) show the
P/W relay pin numbers.

1 5

P/W
RELAY

2 3

2 2G 9 2G 2 2K 10 2G

4. Internal wiring
Wiring inside the junction block These lines show the junction block
internal wiring.
(1/1)

1 5

P/W
RELAY

2 3

2 2G 9 2G 2 2K 10 2G

- 10 -
 Connector Joining Wire Harness and
Wire Harness

R9 R8 The highlighted area shows the symbols

REAR DOOR SPEAKER REAR DOOR SPEAKER for the connectors that join the wire har-
RH LH nesses.
(1/2)
(*1)

(*1)

(*1)

(*1)
W

W
R

R
11 BB1 10 BB1 11 BA1 10 BA1

BB1
(*1)

(*1)
B

The alphanumeric characters in the rect-

angle (BB1) show the connector code,
and the number outside the rectangle
(11) shows the pin number.
Also, the symbol ( ) indicates a male
connector side.
(2/2)

11 BB1

Male

Female

- 11 -
 Splice Points and Ground Point
The hexagonal symbol in the highlighted
area shows the splice point, and the tri-
angle symbol shows the ground point.
The splice point connects directly to the
wire without passing through a connec-
tor. (B7) and (E1) are splice point codes.
The ground point connects the wire to
the body or engine, etc.
W-B

W-B

W-B
(BH) and (EB) are ground point codes.
(1/1)

B7 E1

Splice point

BH EB

Ground point

Wiring Color
2 2
The alphanumeric characters in the
1 1 highlighted area show the wiring color.
The wiring colors also include striped
colors. These are expressed as L-Y with
R-B

R-B

R-L

R-L

the first letter standing for the wire base

color and the second letter standing for
HEADLIGHT

HEADLIGHT

HEADLIGHT

HEADLIGHT

1 2 1 2 the stripe color.

RH(HIGH)
LH(HIGH)

RH(LOW)
LH(LOW)

HINT:
H12

H13

H14

H11

2 1 2 1 Some EWD show the actual colors

for the wiring colors, and other EWD
show the wires in black and white.

R-G
R-G

R-Y

R-Y

- 12 -
 • Meanings of all alphanumeric
characters
(1/1)

B ¥ ¥ BLACK BR ¥ ¥ BROWN
G ¥ ¥ GREEN GR ¥ ¥ GRAY
L ¥ ¥ BLUE LG ¥ ¥ LIGHT
GREEN
O ¥ ¥ ORANGE
R ¥ ¥ RED P ¥ ¥ PINK
W ¥ ¥ WHITE V ¥ ¥ VIOLET
SB ¥ ¥ SKY BLUE Y ¥ ¥ YELLOW

Ex. Stripe type

L-Y

Power Source
J POWER SOURCE (Current Flow Chart) In this section, you will learn which sys-
tems are covered by each fuse.
Engine Room R/B (See page 24 (Gasoline), 26 (Diesel)) For example, the diagram indicates that
Fuse System Page the "10A, HORN" fuse covers only the
5A ALT-S Charging 100
"HORN".
10A HAZARD Turn Signal and Hazard Warning Light 150
Headlight (Australia) 136
Also, the "15A, DOME" fuse covers mul-
10A HEAD LH
Headlight (Except Australia) 134 tiple systems, including the "Interior
10A HEAD RH
Headlight (Australia) 136 Light", "Air Conditioner (Automatic A/C)",
Headlight (Except Australia) 134 "Clock", "Combination Meter", and other
10A HORN Horn 240
systems.
Air Conditioner (Automatic A/C) 276
Clock 170 The page numbers in the diagram refer
Combination Meter 260 to the system circuits.
Engine Control (1NZ-FE, 2NZ-FE) 114 (1/1)
Engine Control (1ZZ-FE, 3ZZ-FE) 102
Headlight (Australia) 136
Headlight (Except Australia) 134
15A DOME
Interior Light 140
Key Reminder and Light Reminder Buzzer 164
Radio and Player 250
Seat Belt Warning 242
TVSS (Australia) 210
Wireless Door Lock Control (LHD) 192
Wireless Door Lock Control (RHD) 198
ECT and A/T Indicator (1NZ-FE, 2NZ-FE) 220

- 13 -
 Information of System Circuit
R3 (A) RADIO AND PLAYER
(A) 4-GROUND : Always approx. 12 volts
When the area to be repaired or
(A) 3-GROUND : Approx. 12 volts with the ignition SW at ACC or ON position inspected is found in the system circuit
(A) 7-GROUND : Always continuity
diagram, refer to the next pages follow-
:PARTS LOCATION
ing the diagram.
Code See Page Code See Page Code See Page
This page gives an overview of and hints
A30 52 (RHD)
J3
41 (LHD) 43 (LHD S/D) for the system.
42 (LHD S/D) 53 (RHD) 45 (LHD W/G)
44 (LHD W/G)
R3 A
41 (LHD) R9 55 (RHD S/D) It also gives the reference for the
F9 54 (RHD S/D)
56 (RHD W/G)
53 (RHD)
41 (LHD)
57 (RHD W/G)
59 (RHD H/B)
"ELECTRICAL WIRING ROUTING" that
R4 B
2H 58 (RHD H/B)Engine Room Main Wire and53Instrument
29 (LHD)
29 (RHD)
(RHD) Panel J/B (Lower Finish Panel) 55 (RHD S/D) shows where the parts are located in the
42 (LHD S/D) Engine Room Main Wire and43Instrument
(LHD S/D)Panel J/B (Left SideT5
of the Instrument Panel)
57 (RHD W/G)
2P
29 (LHD)
44 (LHD W/G) Instrument Panel Wire and Instrument Panel
45 (LHD W/G) J/B (Lower Finish Panel)59 (RHD H/B) vehicle.
F10 54 (RHD S/D)Instrument Panel Wire
29 (RHD) R8 and Instrument Panel J/B (Left Side of the Instrument
55 (RHD S/D) 55 (RHDPanel)
S/D)
56 (RHD W/G) 57 (RHD W/G) T6 57 (RHD W/G) (1/1)
:CONNECTOR
58 (RHD H/B) JOINING WIRE HARNESS AND WIRE HARNESS 59 (RHD H/B)
59 (RHD H/B)
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
66 (LHD)
IA1 Instrument Panel Wire and Floor Wire (Left Kick Panel)
80 (RHD)
IB2 80 (RHD)
Front Door LH Wire and Instrument Panel Wire (Left Kick Panel)
IB3 66 (LHD)
IF1 68 (LHD)
Front Door RH Wire and Instrument Panel Wire (Right Kick Panel)
IG2 82 (RHD)
70 (LHD S/D)
72 (LHD W/G)
BA1 84 (RHD S/D) Rear Door LH Wire and Floor Wire (Left Side of the Center Pillar)
86 (RHD W/G)
88 (RHD H/B)
70 (LHD S/D)
72 (LHD W/G)
BB1 84 (RHD S/D) Rear Door RH Wire and Floor Wire (Right Side of the Center Pillar)
86 (RHD W/G)
88 (RHD H/B)

To Find the Desired Location

RADIO AND PLAYER
FROM POWER SOURCE SYSTEM (SEE PAGE 92) *1 : W/REAR SPEAKER
*2 : W/TWEETER
As an example, let's find "pin 11 of con-
nector BB1" of the RADIO AND PLAYER
1 *3 : W/O TWEETER
*4 : W/ POWER WINDOW OR W/ DOOR LOCK CONTROL
*5 : EXCEPT 4
*7 : FROM OCT. 2001 PRODUCTION
15A 15A
*8 : BEFORE OCT. 2001 PRODUCTION

and the REAR DOOR SPEAKER as well

DOME CIG

R9 R8
A30
2 REAR DOOR SPEAKER REAR DOOR SPEAKER
ANTENNA
RH LH

as the location of the "REAR DOOR

1 1 AMPLIFIER
SB(GR)

SPEAKER RH".
(*1)

(*1)

(*1)

(*1)
L-Y

W
R

1
30
J3

(The subject vehicle is a left-hand drive

JUNCTION
(W/REAR WINDOW ANTENNA TYPE)

CONNECTOR
4 2H 79 11 BB1 10 BB1 11 BA1 10 BA1

sedan type.)
BB1
(*1)

(*1)
B

Y
B

8 2F

(1/8)
3 IA1 9 IA1
L-Y

(*1)

(*1)

(*1)

(*1)
W
R
SB(GR)

R3 A , R4 B 8 A (*7)
4 A 3 A RADIO AND PLAYER 9 A (*8) 1 B 3 B 2 B 6 B
BU +B ACC+B ANT+B RR+ RR- RL+ RL-

GND FR+ FR- FL+ FL-

7 A 1 A 5 A 2 A 6 A
(*4)

(*4)
BR

LG

V
L

(*5)

(*5)
P

4 IF1 3 IF1 4 IB3 3 IB3 4 IB3 3 IB3 (LHD)

4 IG2 3 IG2 4 IB2 3 IB2 4 IB2 3 IB2 (RHD)
BR

IF

- 14 -
 First, let's find the position of "pin 11 of
RADIO AND PLAYER
FROM POWER SOURCE SYSTEM (SEE PAGE 92)
the connector joining wire harness and
wire harness called BB1".
*1 : W/REAR SPEAKER
*2 : W/TWEETER
1 *3 : W/O TWEETER
*4 : W/ POWER WINDOW OR W/ DOOR LOCK CONTROL
*5 : EXCEPT 4
15A
DOME
15A
CIG
*7 : FROM OCT. 2001 PRODUCTION
*8 : BEFORE OCT. 2001 PRODUCTION

R9 R8
(The subject vehicle is a left-hand drive
sedan type.)
A30
2 REAR DOOR SPEAKER REAR DOOR SPEAKER
ANTENNA
RH LH
1 1 AMPLIFIER

11 BB1 10 BB1 11 BA1 10 BA1 (2/8)

SB(GR)

(*1)

(*1)

(*1)

(*1)
L-Y

W
R

R
1
30
J3
JUNCTION

(W/REAR WINDOW ANTENNA TYPE)

CONNECTOR
4 2H 79 11 BB1 10 BB1 11 BA1 10 BA1

BB1

(*1)

(*1)
BB1

(*1)

(*1)
B
8 2F

Y
3 IA1 9 IA1
L-Y

(*1)

(*1)

(*1)

(*1)
W
R
SB(GR)

Y
R3 A , R4 B 8 A (*7)
4 A 3 A RADIO AND PLAYER 9 A (*8) 1 B 3 B 2 B 6 B
BU +B ACC+B ANT+B RR+ RR- RL+ RL-

GND
7 A
FR+
1 A 5 A
FR- FL+
2 A 6 A
FL-
3 IA1 9 IA1
(*4)

(*4)
BR

LG

V
L

(*5)

(*5)
P

4 IF1 3 IF1 4 IB3 3 IB3 4 IB3 3 IB3 (LHD)

4 IG2 3 IG2 4 IB2 3 IB2 4 IB2 3 IB2 (RHD)
BR

IF

F10 54 (RHD S/D) R8 55 (RHD S/D) 55 (RHD S/D) Looking at the information page of the
56 (RHD W/G) 57 (RHD W/G) T6 57 (RHD W/G)
58 (RHD H/B) 59 (RHD H/B) 59 (RHD H/B) system circuit, the item under "CON-
:RELAY BLOCKS
NECTOR JOINING WIRE HARNESS
Code See Page Relay Blocks (Relay Blocks Location)
AND WIRE HARNESS" refers us to
1
24 (Gasoline)
Engine Room R/B (Engine Compartment Left) page 70 for BB1 connector (LHD S/D).
26 (Diesel)
(3/8)
:JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page Junction Block and Wire Harness (Connector Location)
29 (LHD) Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
2F
29 (RHD) Instrument Panel Wire and Instrument Panel J/B (Left Side of the Instrument Panel)
29 (LHD) Engine Room Main Wire and Instrument Panel J/B (Lower Finish Panel)
2H
29 (RHD) Engine Room Main Wire and Instrument Panel J/B (Left Side of the Instrument Panel)
29 (LHD) Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
2P
29 (RHD) Instrument Panel Wire and Instrument Panel J/B (Left Side of the Instrument Panel)

:CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

Code See Page Joining Wire Harness and Wire Harness (Connector Location)
66 (LHD)
IA1 Instrument Panel Wire and Floor Wire (Left Kick Panel)
80 (RHD)
IB2 80 (RHD)
Front Door LH Wire and Instrument Panel Wire (Left Kick Panel)
IB3 66 (LHD)
IF1 68 (LHD)
Front Door RH Wire and Instrument Panel Wire (Right Kick Panel)
IG2 82 (RHD)
70 (LHD S/D)
72 (LHD W/G)
BA1 84 (RHD S/D) Rear Door LH Wire and Floor Wire (Left Side of the Center Pillar)
86 (RHD W/G)
88 (RHD H/B)
70 (LHD S/D)
72 (LHD W/G)
BB1 84 (RHD S/D) Rear Door RH Wire and Floor Wire (Right Side of the Center Pillar)
86 (RHD W/G)
88 (RHD H/B)

- 15 -
 Opening to page 70 we see the heading
"Location of Connector Joining Wire
Harness and Wire Harness".
G ELECTRICAL WIRING ROUTING
This shows us where connector BB1 is
: Location of Connector Joining Wire Harness and Wire Harness located in the vehicle.
: Location of Ground Point (4/8)
[LHD : S/D] Roof Wire Front Door Instrument BB1 Rear Door
RH Wire Panel Wire RH Wire

BK

Front Door
LH Wire
Rear Window
No.2 Wire
BA1

Rear Door Instrument Panel BI BJ

70 Floor Wire LH Wire No.3 Wire

Then, turning to the next page we can

find the BB1 pin number diagram.
This shows us the shape of the connec-
tor and the position of pin 11 of connec-
Connector Joining Wire Harness and Wire Harness
tor BB1.
We can also find the position of this pin
BA1 BB1 by searching for the connector code in
the section titled "CONNECTOR LIST".
(5/8)
1 2 3 1 2 3
3 2 1 3 2 1
4 5 6 7 8 4 5 6 7 8
8 7 6 5 4 8 7 6 5 4
9 10 11 12 13 9 10 11 12 13
13 12 11 10 9 13 12 11 10 9

Code Joining Wire Harness and Wire Harness (Connector Locarion)

BA1 Rear Door LH Wire and Floor Wire (Left Side of the Center Pillar)
BB1 Rear Door RH Wire and Instrument Panel Wire (Right Side of the Center Pillar)

- 16 -
 Next, let's look for the location of the
RADIO AND PLAYER
FROM POWER SOURCE SYSTEM (SEE PAGE 92)
connector code R9 "REAR DOOR
SPEAKER RH".
*1 : W/REAR SPEAKER
*2 : W/TWEETER
1 *3 : W/O TWEETER
*4 : W/ POWER WINDOW OR W/ DOOR LOCK CONTROL
*5 : EXCEPT 4
15A
DOME
15A
CIG
*7 : FROM OCT. 2001 PRODUCTION

R9
*8 : BEFORE OCT. 2001 PRODUCTION

R9 R8
R8 (6/8)
A30

REAR DOOR SPEAKER REAR DOOR S

2 REAR DOOR SPEAKER REAR DOOR SPEAKER
ANTENNA
RH LH
1 1 AMPLIFIER

RH LH

SB(GR)

(*1)

(*1)

(*1)

(*1)
L-Y

W
R

R
1
30
J3
JUNCTION

(W/REAR WINDOW ANTENNA TYPE)

CONNECTOR
4 2H 79 11 BB1 10 BB1 11 BA1 10 BA1

BB1

(*1)

(*1)
B

Y
B
8 2F

3 IA1 9 IA1
L-Y

(*1)

(*1)

(*1)
(*1)

(*1)

(*1)

(*1)
W
W
R
SB(GR)

Y
R

R
R3 A , R4 B 8 A (*7)
4 A 3 A RADIO AND PLAYER 9 A (*8) 1 B 3 B 2 B 6 B
BU +B ACC+B ANT+B RR+ RR- RL+ RL-

GND FR+ FR- FL+ FL-

7 A 1 A 5 A 2 A 6 A

11 BB1 10 BB1 11 BA1 10

(*4)

(*4)
BR

LG

V
L

(*5)

(*5)
P

4 IF1 3 IF1 4 IB3 3 IB3 4 IB3 3 IB3 (LHD)

4 IG2 3 IG2 4 IB2 3 IB2 4 IB2 3 IB2 (RHD)
BR

IF

Turn to the system circuit information

R3 (A) RADIO AND PLAYER
page. The connector code for the
(A) 4-GROUND : Always approx. 12 volts "REAR DOOR SPEAKER RH" is R9.
(A) 3-GROUND : Approx. 12 volts with the ignition SW at ACC or ON position
(A) 7-GROUND : Always continuity The item under "PARTS LOCATION"
refers us to page 43 for R9 (LHD S/D).
:PARTS LOCATION (7/8)
Code See Page Code See Page Code See Page
A30 52 (RHD) 41 (LHD) 43 (LHD S/D)
J3
42 (LHD S/D) 53 (RHD) 45 (LHD W/G)
44 (LHD W/G) 41 (LHD) R9 55 (RHD S/D)
R3 A
F9 54 (RHD S/D) 53 (RHD) 57 (RHD W/G)
56 (RHD W/G) 41 (LHD) 59 (RHD H/B)
R4 B
58 (RHD H/B) 53 (RHD) 55 (RHD S/D)
42 (LHD S/D) 43 (LHD S/D) T5 57 (RHD W/G)
44 (LHD W/G) 45 (LHD W/G) 59 (RHD H/B)
F10 54 (RHD S/D) R8 55 (RHD S/D) 55 (RHD S/D)
56 (RHD W/G) 57 (RHD W/G) T6 57 (RHD W/G)
58 (RHD H/B) 59 (RHD H/B) 59 (RHD H/B)

:RELAY BLOCKS
Code See Page Relay Blocks (Relay Blocks Location)
24 (Gasoline)
1 Engine Room R/B (Engine Compartment Left)
26 (Diesel)

:JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

Code See Page Junction Block and Wire Harness (Connector Location)
29 (LHD) Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
2F
29 (RHD) Instrument Panel Wire and Instrument Panel J/B (Left Side of the Instrument Panel)
29 (LHD) Engine Room Main Wire and Instrument Panel J/B (Lower Finish Panel)
2H
29 (RHD) Engine Room Main Wire and Instrument Panel J/B (Left Side of the Instrument Panel)
29 (LHD) Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
2P
29 (RHD) Instrument Panel Wire and Instrument Panel J/B (Left Side of the Instrument Panel)

:CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

- 17 -
 G
Page 43 is titled "Position of Parts in
Body".
Position of Parts in Body This shows us where the part corre-
[LHD : S/D] sponding to the connector code R9
R13 P10 P4 M2 M1 R14 P5 P14 R9 P12 P7
REAR DOOR SPEAKER RH is located
on the vehicle.
The parts location of purpose can be
found by looking as follows.
System circuit
↓
P9
Information page
P8 R11
↓
R7
Reference page
(8/8)

P13 P11 R8 P6 R10 R6

M 1 Moon Roof Control SW and Relay R 6 Rear Combination Light LH

M 2 Moon Roof Monitor and Limit SW R 7 Rear Combination Light RH
R 8 Rear Door Speaker LH
P 4 Personal Light R 9 Rear Door Speaker RH
P 5 Power Window Control SW (Front Passenger’s Side) R10 Rear Window Defogger

- 18 -
Exercise

Use the Exercises to check your level of understanding for the material in this Chapter. After answering each
Exercise, you can use the reference button to check the pages related to the current question. When you get
a incorrect answer, please return to the text to review the material and find the correct answer. When all
questions have been answered correctly, you can go to the next Chapter.
In this chapter, the Work Sheet is prepared as a part of exercises.
Click on the following underline, and open the Work Sheet.
Then, print it out before using.

Chapter All
Next Chapter All
Answers Answers
Correct Correct
Page with Exercises Page with Exercises
Related Text Related Text
Incorrect Incorrect
Answer Answer

Return to page of Return to page of

related text for review related text for review

How to use the Worksheet

In this chapter, the Work Sheet is prepared as a part of exercises.

Click on the Worksheet Download, and the Worksheet opens.
Print it out and fill your name in.
According to the questions, write the actual measuring value, etc.
Hand it to the Instructor after writing in the Worksheet.

- 19 -
Question- 1
The following statements pertain to the recent EWD. Mark each of the following statements True or False.

No. Question True or False Correct Answers

1 In the "SYSTEM CIRCUIT", the connector shape can be checked. True False

In the "ELECTRICAL WIRING ROUTING", parts location in the vehi-

2 True False
cle can be checked.

In the contents of "SYSTEM CIRCUIT", the system names are listed

3 True False
alphabetically.

In the "CONNECTOR LIST", the connector code location in the

4 True False
vehicle can be checked.

Question- 2
In the illustration, locate the locking portion of the connector in the top, and read the pin number from the connecting
side.
The "X" portion of the connector in the following illustration indicates the same pin number.
From the following word group, select the appropriate pin number.

1. Pin number 1
2. Pin number 2
3. Pin number 3
4. Pin number 4

X
Femaie connector
Maie connector

Question- 3
When the color code of the wire is L-B, select the appropriate one that the wire is indicated in the EWD.
1. 2.

Black Blue

Green Black

Black Blue

3. 4.

Green Black

Black Blue

Green Black

Answer: 1. 2. 3. 4.

- 20 -
Toyota Technician Course Guide
Toyota Technician>>Purpose of Periodic Maintenance
PPT Ref. Time
Group Unit Instruction Points
No. (page) Needed

Understand the goals of periodic maintenance.

- The purpose of the periodic maintenance is to prevent major problems from occurring in the future.
To maintain the vehicle in a condition that complies with various regulations.
To extend the life of the vehicle.
To enable the customers to enjoy a safe and economical automobile experience.
- The maintenance schedule varies by country and region, and also by local regulations. Trainees should understand the maintenance
schedule for the country they work in.

[Purpose of Purpose of Periodic Maintenance Purpose of Periodic Maintenance 1 1/1 10min.

Periodic
Maintenance] Maintenance Schedule Maintenance Schedule 2 1/3
Service Intervals 3 2/3

Toyota Technician>>Periodic Maintenance>>Description

PPT Ref. Time
Group Unit Instruction Points
No. (page) Needed
[Description] Description Explain methods for periodic maintenance. 1 1/1 20min.
Operations Efficiency Explain points for achieving efficient operations. 2 1/1
Lift Position and the Path Explain the position, operations, or path of each lift position. 3-12 1/10

1
 Name
Diagnosis Technician Work Sheet 4
Basic Diagnosis Technician>>Electrical Wiring Diagram

Use the EWD to check the followings.

Vehicle name and Pub. No. of EWD for use

Vehicle name Pub. No.

1. Check the name, capacity and location in the vehicle of the fuse connected to HEADLIGHT RH LOW.

(1) Open the page "HEADLIGHT " in the SYSTEM CIRCUIT section.

(2) Look for the part "HEADLIGHT RH (LOW)" in the EWD.

(3) Check and write the name and the code (connector code) of R/B (or J/B) and the capacity of fuse which is connected
to "HEADLIGHT RH (LOW)".

Connector code of
R/B (J/B)

Fuse name: capacity : A

(4) Check the See Page that this fuse is listed based on the connector code of R/B (or J/B) from "RELAY BLOCKS" or
"JUNCTION BLOCK AND WIRE HARNESS CONNECTOR" section in the information page.

(5) Check the fuse location in the R/B (or J/B) with the "RELAY LOCATIONS".

(6) Check the See Page listed in the "RELAY LOCATIONS" and open the page.

(7) Check the location in the diagram where the R/B (or J/B) is in the vehicle in the diagram.

(8) In case it is possible to prepare the vehicle used in the EWD, check the fuse location with the actual vehicle.

2. Check the location of water temperature sensor (engine coolant temperature switch) used in "ENGINE CONTROL" in the
vehicle.

(1) Open the page "ENGINE CONTROL" in the SYSTEM CIRCUIT section.

(2) Look for the part "Water temp. sensor" in the EWD to check the connector code.

Connector code

(3) Check the See Page that the water temp. sensor is listed based on the connector code from "PARTS LOCATION"
item in the information page.

(4) Check the location of the water temp. sensor in the "ELECTRICAL WIRING ROUTING".

(5) In case it is possible to prepare the vehicle used in the EWD, check the location of the "water temp. sensor" with the
actual vehicle.
 Name
Diagnosis Technician Work Sheet 5
Basic Diagnosis Technician>>Electrical Wiring Diagram

3. Check the location in the vehicle of the connector that connects the wire harness from "REAR SPEAKER RH" with the wire
harness from "RADIO AND PLAYER".
Also, check which pin in the connector is used in "REAR SPEAKER RH PLUS SIDE"

(1) Open the page "RADIO AND PLAYER" page in the SYSTEM CIRCUIT section.

(2) Look for the part "REAR SPEAKER RH" and "RADIO AND PLAYER" in the EWD.
Look for the connector to connect these wire harnesses and write the connector code and pin number.

Connector code

Pin number

(3) Check the See Page that this connector is listed from "CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS"
item in the information page.

(4) Check the connector location in the vehicle with the diagram by "Location of Connector Joining Wire Harness and
Wire Harness" item in the "ELECTRICAL WIRING ROUTING".

(5) Check the connector shape and pin location in the diagram with "Connector Joining Wire Harness and Wire Harness"
in the "ELECTRICAL WIRING ROUTING".

(6) In case it is possible to prepare the vehicle used in the EWD, check the connector shape and location and pin location
with the actual vehicle.

4. Check the ground location of "TAILLIGHT RH" in the vehicle.

(1) Open the page "TAILLIGHT" in the SYSTEM CIRCUIT section.

(2) Look for the "TAILLIGHT RH" and the ground connected to it in the EWD.

Code

(3) Check the See Page that the ground is listed from "GROUND POINTS" item in the information page.

(4) Check the ground point location in the vehicle with the diagram by "Location of Ground Points" item in the "ELECTRICAL
WIRING ROUTING".

(5) In case it is possible to prepare the vehicle used in the EWD, check the ground point location with the actual vehicle.