Toyota Sequoia (2005). Manual - part 476

I28394

Parking Brake Switch

Door Lock Motor

Rear Power 
Window Motor

Courtesy Light 
Switch

Courtesy Light

Rear Courtesy Light Switch

Horn Switch

Stop Light

Rear Room Light

Front Map Light

Courtesy Light

Rear Courtesy 
Light Switch

Door Lock Motor

Rear Power 
Window Motor

Rear Window Control 
Switch RH

Door Lock Motor

Power Window Switch

 Passenger Door ECU

 Door Lock Control Switch

 Power Window Switch

Stop Light

Power Window
Master Switch

 Driver 

Door ECU

 Door Lock 

Control Switch

 Power 

Window Switch

 Window Lock

Switch

Door Lock Motor

Rear Window 
Control Switch LH

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1699

1893

DI94S–08

DI–1700

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1894

CIRCUIT INSPECTION

Power source circuit

CIRCUIT DESCRIPTION

This circuit provides power to operate the body ECU.
BDR terminal: Power source for door lock motor
S+B terminal: Power source for security horn
ACC terminal: Power source for accessory
BECU terminal: Power source for backing up body ECU
IG terminal: Power source for starting body ECU
WIG terminal: Power source for washer motor

I28515

Engine Room J/B

Body ECU

Instrument Panel J/B

SECURITY

I18
Ignition SW

BDR

ACC

BECU

S+B

B6

L–W

IA5

2D

2C

2H

1C

1E

1G

1L

1G

1G

1C

1C

1J

1

2

3

4

5

6

7

10

11

5

6

2

5

8

1

10

1

3

3

2

1

6

L–W

IA5

10

B6

B7

B6

1

2

1

8

1

2

DOOR No. 2

ECU–B

Short
Pin

2

W–L

W–L

W–R

B

B

W

GR

W–R

P

RAD No. 2

AM1

WSH

ECU–IG

1

2

AM1

ACC

B7

IG1

W–L

ALT

R/B

F10
FL Block

Battery

L–Y

B–R

B–Y

B

W–B

B7

B6

IE

1

2

IG

WIG

GND1

1

W–R

1

2

3A

3E

Sub J/B No. 3

4

Engine Room R/B No. 2

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1701

1895

WIRING DIAGRAM

DI–1702

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1896

INSPECTION PROCEDURE

1

Check RAD No. 2, AM1, WSH, ECU–IG, Door No. 2 and ECU–B fuses.

CHECK:
Check for continuity of the RAD No. 2, AM1, WSH, ECU–IG, door No. 2 and ECU–B fuses.
OK:

Continuity

NG

Replace defective fuse.

OK

2

Check voltage between terminals ACC, WIG, IG, BECU, S+B, BDR and GND1 of
body ECU connector.

PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals ACC, WIG, IG and GND1.
OK:

Voltage: 10 to 14 V

PREPARATION:
Turn the ignition switch OFF.
CHECK:
Measure the voltage between terminals BECU, BDR, S+B and GND1.
OK:

Voltage: 10 to 14 V

OK

Proceed to next circuit inspection shown in
problem symptoms table (See page 

DI–1686

).

NG