Toyota Sequoia (2005). Manual - part 499

I18711

D20
Door Unlock Detection 
SW Front LH

D22
Driver Door ECU

LSWD

LSWE

24

9

R–Y

W–B

3

4

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

DI–1791

1985

Door unlock detection switch circuit

CIRCUIT DESCRIPTION

The door unlock detection switch is built in the door lock motor. This switch is ON when the door lock knob
is in the unlock position and OFF when the lock knob is in the lock position. The ECU detects the door lock
knob conditions in this circuit. It is used as one of the operating conditions for the key confinement prevention
function.

WIRING DIAGRAM

DI1PG–16

DI–1792

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

1986

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 door unlock detection 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.
D–DOOR:

Item

Measurement Item/Dis-

play (Range)

Normal Condition

Diagnostic Note

LOCK POS SW

Lock position SW signal/

ON or OFF

ON: Door lock is in unlock position

OFF: Door lock is in lock position

–

OK:

Indication on the tester switches between ON and OFF in accordance with the door unlock
detection switch status.

OK

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

DI–1782

).

NG

2

Check door unlock detection switch (See page 

BE–79

).

NG

Replace the door lock assembly.

OK

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

DI–1793

1987

3

Check wire harness and connector between door unlock detection switch and
driver 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–1782

).

I18710

D22
Driver Door ECU

D20
Door Key Lock and 
Unlock SW Front LH

LSWE

KUL

KL

9

10

22

W–B

LG–R

LG–B

3

6

5

DI–1794

–

DIAGNOSTICS

DRIVER DOOR CONTROL SYSTEM

1988

Door key lock and unlock switch circuit

CIRCUIT DESCRIPTION

The door key lock and unlock switch is built in the door lock motor. When the key is turned to the lock side,
terminal 5 of the switch is grounded and when the key is turned to the unlock side, terminal 6 of the switch
is grounded.
The door key lock and unlock switch can be checked using the DTC check (refer to 

DI–1904

).

WIRING DIAGRAM

DI1PH–17