Toyota Sequoia (2005). Manual - part 521

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

DI–1879

2073

3

Check wire harness and connector between back door power window pulse sen-
sor and back door 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–1854

).

I28434

Back Door ECU

R16
Rear Wiper Motor

WIP–

4

5

L–Y

L–O

WIP+

1

2

B10

B10

R

F

DI–1880

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

2074

Rear wiper motor circuit

CIRCUIT DESCRIPTION

The wiper motor is controlled by the back door ECU.

WIRING DIAGRAM

DI94K–04

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

DI–1881

2075

INSPECTION PROCEDURE

HINT:
When using the hand–held tester, start the inspection from step 1 and when not using the hand–held tester,
start from step 2.

1

Check the rear wiper motor using hand–held tester.

PREPARATION:
(a)

Connect the hand–held tester to the DLC3.

(b)

Turn the ignition switch ON.

CHECK:
According to the display on the tester, perform the ACTIVE TEST.
BACK–DOOR:

Item

Test details

Diagnostic note

REAR WIPER

Operate the rear wiper motor ON/OFF

–

OK:

Rear wiper motor operates normally.

OK

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

DI–1854

).

NG

2

Check rear wiper motor (See page 

BE–49

).

NG

Replace the rear wiper motor.

OK

3

Check wire harness and connector between wiper motor and back door 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–1854

).

I18725

Back Door ECU

BKUL

1

2

G

B12
Back Door Key Lock and Unlock SW

3

R–W

L

KEYE

BKL

5

4

B10

19

B10

B10

DI–1882

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

2076

Back door key lock and unlock switch circuit

CIRCUIT DESCRIPTION

The back door ECU operates the back door lock motor based on information from the back door key lock
and unlock switch.
The back door power window goes up when the key is inserted into the cylinder and turned to the LOCK
position. The window goes down when the key is turned to the UNLOCK position.

WIRING DIAGRAM

DI94L–05