Toyota Sequoia (2005). Manual - part 517

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

DI–1863

2057

3

Check wire harness and connector between back door ECU and battery 
(See page 

IN–35

).

NG

Repair or replace wire harness or connector.

OK

4

Check wire harness and connector between back door ECU and body ground 
(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

).

I18726

Back Door ECU

BDCY

B10

7

2

1

W–B

B9
Back Door Courtesy Light Switch

CTYE

B10

20

R

DI–1864

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

2058

Back door courtesy light switch circuit

CIRCUIT DESCRIPTION

The back door courtesy light switch is built in the back door lock assembly.
This switch comes on when the back door is opened and goes off when the back door is closed.

WIRING DIAGRAM

DI57K–07

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

DI–1865

2059

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 courtesy light 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

COURTSY SW

Back door courtesy

light SW signal/ON or

OFF

ON: Back door is open

OFF: Back door is closed

–

OK:

Indication on the tester switches between ON and OFF in accordance with the courtesy light
switch status.

OK

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

DI–1854

).

NG

2

Check back door courtesy light switch (See page 

BE–40

).

NG

Replace the back door lock assy.

OK

DI–1866

–

DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

2060

3

Check wire harness and connector between back door courtesy light 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

).