Toyota Sequoia (2005). Manual - part 519

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

DI–1871

2065

3

Check wire harness and connector between back door unlock detection 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

).

I18723

Back Door ECU

ACT+

B10

15

3

4

L–R

B13
Back Door Lock Motor

L–B

B10

14

ACT–

DI–1872

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

2066

Back door lock motor circuit

CIRCUIT DESCRIPTION

When the back door ECU receives a LOCK/UNLOCK demand signal from the body ECU or back door key
lock and unlock switch, etc., it operates the back door lock motor based on the signal.

WIRING DIAGRAM

DI94G–05

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

DI–1873

2067

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 lock 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

DOOR LOCK

Operate the door lock motor at rear door LOCK/

UNLOCK

–

OK:

Back door lock motor operates normally.

OK

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

DI–1854

).

NG

2

Check back door lock motor (See page 

BE–79

).

NG

Replace the back door lock motor.

OK

3

Check wire harness and connector between back door lock 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

).

I28432

Back Door ECU

B10

B10

25

13

4

1

W

P

B14
Back Door
Power Window Motor

BDDN

BDUP

D

U

DI–1874

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

2068

Back door power window motor circuit

CIRCUIT DESCRIPTION

The back door power window goes down when voltage is applied to the BDDN terminal of the back door
ECU, and the window goes up when voltage is applied to the BDUP terminal.

WIRING DIAGRAM

DI94H–05