Toyota Sequoia (2005). Manual - part 480

I24352

Body ECU

B5

KSW

IG

U1
Key Unlock Warning Switch

O

1

2

Y–G

13

A

A

J43
J/C

O

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1715

1909

Key unlock warning switch circuit

CIRCUIT DESCRIPTION

The key unlock warning switch turns on when the ignition key is inserted into the key cylinder and turns off
when the key is removed.

WIRING DIAGRAM

DI571–11

DI–1716

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1910

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 key unlock warning 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”.
BODY ECU:

Item

Measurement Item/Display

(Range)

Normal Condition

Diagnostic Note

KEY UNLK WRN SW

Key unlock warning switch/ON or

OFF

ON: Key is in ignition key cylinder

OFF: No key is in ignition key cyl-

inder

–

OK:

The indication on the tester switches between ON and OFF in accordance with the key unlock
warning switch status.

OK

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

DI–1686

).

NG

2

Check key unlock warning switch (See page 

BE–24

).

NG

Replace key unlock warning switch.

OK

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1717

1911

3

Check wire harness and connector between key unlock warning switch and
body ECU, key unlock warning switch 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–1686

).

I28517

R–L

B2
Back Door Power Window Control Switch

UP

DOWN

B6

BDN

14

15

6

B6

BUP

3

5

W

P–L

B6

21

PWS

Body ECU

DI–1718

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1912

Back door power window switch circuit

CIRCUIT DESCRIPTION

The body ECU detects the condition of the back door power window switch and sends the related information
to the back door ECU via BEAN.

WIRING DIAGRAM

DI572–08