Toyota 4Runner: Back Door Courtesy Switch Circuit

Toyota 4Runner Service Manual / Vehicle Interior / Lighting (int) / Lighting System / Back Door Courtesy Switch Circuit

DESCRIPTION

The multiplex network door ECU receives a back door open/closed signal from the back door lock.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM (BACK DOOR COURTESY LIGHT SWITCH)

(a) Using the Techstream, read the Data List (See page ).

Back Door

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Back Door Courtesy Switch	Back door courtesy light switch signal / ON or OFF	ON: Back door open OFF: Back door closed	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Back Door Courtesy Switch

Back door courtesy light switch signal / ON or OFF

ON: Back door open

OFF: Back door closed

OK:

Tester display changes according to opening and closing of back door.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT BACK DOOR LOCK ASSEMBLY (BACK DOOR COURTESY LIGHT SWITCH)

(a) Remove the back door lock (See page ).

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 - 3	Open-latch	Below 1 Ω
2 - 3	Full-latch	10 kΩ or higher

Text in Illustration

	Full-latch
	Open-latch

REPLACE BACK DOOR LOCK ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - MULTIPLEX NETWORK DOOR ECU)

(a) Disconnect the W8 back door lock connector.

(b) Disconnect the W10 multiplex network door ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
W8-2 (S) - W10-10 (BDCY)	Always	Below 1 Ω
W8-2 (S) - Body ground	Always	10 kΩ or higher
W8-3 (E) - W10-18 (CTYE)	Always	Below 1 Ω
W8-3 (E) - Body ground	Always	10 kΩ or higher

REPLACE MULTIPLEX NETWORK DOOR ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR

IG Signal Circuit

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Door Courtesy Switch Circuit

DESCRIPTION The main body ECU (multiplex network body ECU) receives a door open/closed signal from each door courtesy light switch. WIRING DIAGRAM PROCEDURE 1. READ VALU ...

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