Toyota Sequoia (2005). Manual - part 483

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1727

1921

3

Check harness and connector between body ECU and switch, switch and body
ground (See page 

IN–35

).

NG

Repair or replace harness or connector.

OK

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

DI–1686

).

I28518

1

1

1

1

R–W

Body ECU

B7

12

DCTY

PCTY

RRCY

RLCY

B5

22

B5

8

B7

7

R–W

R–W

R–W

LG–B

B–O

LG–B

D14
Door Courtesy Light
Switch Front LH

D9
DIODE

D16
Door Courtesy
Light Switch 
Rear LH

D17
Door
Courtesy
Light Switch
Rear RH

D15
Door Courtesy Light 
Switch Front RH

2

3

B–O

2

3

D8
DIODE

J/C

J30

J29

K

D

J/C

J45

J44

C

J

G

N

J/C

N

G

J45

J44

J/C

J30

J29

GR–R

GR–R

DI–1728

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1922

Door courtesy light switch circuit

CIRCUIT DESCRIPTION

The door courtesy light switch is turned ON when the door is opened and is turned OFF when the door is
closed.

WIRING DIAGRAM

DI577–10

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1729

1923

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 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”.
BODY ECU:

Item

Measurement Item/Display

(Range)

Normal Condition

Diagnostic Note

D DOR CTY SW

Driver door courtesy light switch/

ON or OFF

ON: Driver door is opened

OFF: Driver door is closed

–

P DOR CTY SW

Front passenger door courtesy

light switch/ON or OFF

ON: Front passenger door is

opened

OFF: Front passenger door is

closed

–

Rr DOR CTY SW

Rear passenger door courtesy

light switch/ON or OFF

ON: Rear passenger door is

opened

OFF: Rear passenger door is

closed

–

OK:

The indication on the tester switches between ON and OFF in accordance with the open/close
door status.

OK

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

DI–1686

).

NG

2

Check door courtesy light switch (See page 

BE–40

).

NG

Replace courtesy 

light 

switch.

OK

DI–1730

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1924

3

Check wire harness and connector between door courtesy light switch and body
ECU, door courtesy light 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

).