Toyota Sequoia (2005). Manual - part 477

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1703

1897

3

Check wire harness and connector between body ECU and body ground, body
ECU and battery (See page 

IN–35

).

NG

Repair or replace wire harness or connector.

OK

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

DI–1686

).

I18741

Body ECU

RWW

R1
Rear Washer
Motor

C10
Rear
Wiper and 
Washer 
Switch

RWLS

RWC1

Y–B

G–B

L–O

L–O

WASH1

OFF

INT

ON

WASH2

J8 J/C

1

2

IE

IA1

4

B7

13

A

G–B

G–B

IL1

B5

10

6

25

10

12

7

2

W–B

WR EW

C1R

+1R

B5

DI–1704

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1898

Rear wiper switch and motor circuit

CIRCUIT DESCRIPTION

Body ECU judges the switch position with the terminal voltage of the rear wiper and washer switch and runs
the washer motor.

WIRING DIAGRAM

DI56X–09

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1705

1899

INSPECTION PROCEDURE

1

Check wiper and washer switch (See page 

BE–49

).

NG

Replace wiper and washer switch.

OK

2

Check rear washer motor (See page 

BE–49

).

NG

Replace rear washer motor.

OK

3

Check wire harness and connector between wiper and washer switch and body
ECU, wiper and washer switch and body ground (See page 

IN–35

).

NG

Repair or replace wire harness or connector.

OK

4

Check wire harness and connector between rear washer motor and washer
switch, rear washer motor and body ECU (See page 

IN–35

).

NG

Repair or replace wire harness or connector.

OK

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

DI–1686

).

I24351

Body ECU

11

3

2

1

5

B

5

W

1G

TAILLIGHT Relay

To Taillight

F10
Fusible Link Block

LG

B7

ALT

TRLY

2

1L

8

1

Battery

Instrument Panel J/B

LG

D

D

J/9
J/C

DI–1706

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1900

Taillight Relay Circuit

CIRCUIT DESCRIPTION

TAILLIGHT relay will be ”ON” by operating the light control switch. The transistor which activates the tail light
relay has two sorts: one is activated by the light control switch for fail safe and the other is activated by CPU.
When the theft deterrent system is activated, it causes the transistor in the ECU to switch ON and OFF at
approximately 0.4 sec. intervals. This switches the TAILLIGHT relay ON and OFF, and thus flashing the tail-
lights (See the wiring diagram below).
In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the TAIL-
LIGHT relay switches OFF, and thus stopping the taillights flashing:

(1)

Unlock the front LH or RH door with a key.

(2)

Turn the ignition switch to ACC or ON position.

(3)

Unlock the doors with the wireless door lock control system.

(4)

Wait for approximately 60 seconds.

WIRING DIAGRAM

DI6QY–15