Toyota Sequoia (2005). Manual - part 522

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

DI–1883

2077

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 back door key lock and unlock switch 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, read the DATA LIST.
BACK–DOOR:

Item

Measurement Item/

Display (Range)

Normal Condition

Diagnostic Note

KEY SW (UNLOCK)

Unlock SW linked with

the key/ON or OFF

ON: Back door lock is in unlock position

OFF: Back door lock is in lock position

–

KEY SW (LOCK)

Unlock SW linked with

the key/ON or OFF

ON: Back door lock is in lock position

OFF: Back door lock is in unlock position

–

UP/DOOR KEY

Back door key lock

and unlock switch

linked window open

and close/AVAIL or

NOT AVL

AVAIL: Key–linked open and close SET

NOT AVL: Key–linked open and close UNSET

*1

DOWN/DOOR KEY

Back door key lock

and unlock switch

linked window open

and close/AVAIL or

NOT AVL

AVAIL: Key–linked open and close SET

NOT AVL: Key–linked open and close UNSET

*1

*1: When the ignition key is not in the key cylinder and the back door is locked, turning and holding the back
door key in the lock position for 1.5 seconds or more activates the back door ECU to operate the power win-
dow motor and close the power window.
Similarly, turning and holding the back door key in the unlock position for 1.5 seconds or more when the back
door is unlocked will open the power window.
OK:

Indication on the tester switches between ON and OFF in accordance with the back door key
lock and unlock switch status.

OK

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

DI–1854

).

NG

DI–1884

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

2078

2

Check the back door key lock and unlock switch (See page 

BE–79

).

NG

Replace the back door key lock and unlock
switch.

OK

3

Check wire harness and connector between back door key lock and unlock
switch 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

).

I28435

Back Door ECU

P

1

2

L–R

R16
Rear Wiper Motor

L–B

3

3

L–W

W

SGND

12

18

B10

B10

B10

P

E

W

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

DI–1885

2079

Rear wiper limit switch circuit

CIRCUIT DESCRIPTION

The rear wiper limit switch is built in to the rear wiper motor. The W built in switch of the rear wiper motor is
ON when the rear wiper arm is in the position between stop and reverse and OFF when the rear wiper arm
is in any other position. The P built in switch of the rear wiper motor is OFF when the rear wiper arm is in
any position except stored and ON when the rear wiper arm is in the stored position.

WIRING DIAGRAM

DI94J–04

DI–1886

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

2080

INSPECTION PROCEDURE

1

Check rear wiper motor (See page 

BE–49

).

NG

Replace the rear wiper motor.

OK

2

Check wire harness and connector between rear 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

).