Toyota Sequoia (2005). Manual - part 508

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

DI–1827

2021

INSPECTION PROCEDURE

1

Check ECU–IG, AM1, PWR No. 5 and ECU–B fuse.

CHECK:
Check continuity of the ECU–IG, AM1, PWR No. 5 and ECU–B fuse.
OK:

Continuity

NG

Replace the faulty fuse.

OK

2

Check voltage between terminals BDR, CPUB, SIG and GND of passenger door
ECU connector.

PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals SIG and GND of the passenger door ECU of the wire harness side
connector.
OK:

Voltage: 10 to 14 V

PREPARATION:
(a)

Turn the ignition switch OFF.

(b)

Disconnect the passenger door ECU connector.

CHECK:
Measure the voltage between terminals BDR, CPUB and GND of the passenger door ECU of the wire har-
ness side connector.
OK:

Voltage: 10 to 14 V

OK

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

DI–1818

).

NG

DI–1828

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

2022

3

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

IN–35

).

NG

Repair or replace wire harness or connector.

OK

4

Check wire harness and connector between passenger 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–1782

).

I28437

D21
Door Unlock Detection
SW Front RH

3

R–Y

4

LSWP

LSWE

W–B

4

Front Passenger 
Door ECU

13

24

9

F18 F18

F18 F18

*1: w/ Driving Position Memory
*2: w/o Driving Position Memory

(*1) (*2)

(*1) (*2)

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

DI–1829

2023

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

DI1Q8–09

DI–1830

–

DIAGNOSTICS

PASSENGER DOOR CONTROL SYSTEM

2024

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.
P–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–1818

).

NG

2

Check door unlock detection switch (See page 

BE–79

).

NG

Replace the door lock assembly.

OK