Toyota Sequoia (2005). Manual - part 487

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1743

1937

3

Check wire harness and connector between wireless door lock buzzer and body
ECU, body ground and wireless door lock buzzer (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

).

I24358

Body ECU

P2
Parking
Brake SW

PKB

1

4

B5

3

4

LG–R

LG–R

Sub J/B No. 4

4D

4C

DI–1744

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1938

Parking brake switch circuit

CIRCUIT DESCRIPTION

The body ECU determines if the parking brake switch is ON or OFF and sends the parking brake switch ON/
OFF signal to the combination meter via BEAN.

WIRING DIAGRAM

DI29Y–18

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1745

1939

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 parking brake 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

PARKING BRAKE SW

Parking brake switch/ON or OFF

ON: 

Parking brake pedal depressed

(ON)

OFF: 

Parking brake released (OFF)

–

OK:

The indication on the tester switches between ON and OFF in accordance with the parking
brake switch status.

OK

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

DI–1686

).

NG

2

Check parking brake switch (See page 

BE–55

).

NG

Replace parking brake switch.

OK

DI–1746

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1940

3

Check wire harness and connector between parking brake switch and body 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–1686

).