Toyota 4Runner: Door Courtesy Switch Circuit

Toyota 4Runner Service Manual / Vehicle Interior / Lighting (int) / Lighting System / 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 VALUE USING TECHSTREAM (DOOR COURTESY LIGHT SWITCH)

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

Main Body

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
RR Door Courtesy SW	Rear door courtesy light switch RH signal / ON or OFF	ON: Rear door RH open OFF: Rear door RH closed	-
RL Door Courtesy SW	Rear door courtesy light switch LH signal / ON or OFF	ON: Rear door LH open OFF: Rear door LH closed	-
FR Door Courtesy SW	Front door courtesy light switch RH signal / ON or OFF	ON: Front door RH open OFF: Front door RH closed	-
FL Door Courtesy SW	Front door courtesy light switch LH signal / ON or OFF	ON: Front door LH open OFF: Front door LH closed	-

OK:

Normal conditions listed above are displayed.

Result

Result	Proceed to
OK	A
NG (Front door courtesy light switch does not operate)	B
NG (Rear door courtesy light switch does not operate)	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

GO TO STEP 5

2.	INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (LH OR RH)

(a) Remove the front door courtesy light switch assembly (See page ).

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

Text in Illustration

*a	Component without harness connected (Front Door Courtesy Light Switch Assembly)

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
1 - Switch body	Pin not pushed	Below 1 Ω
1 - Switch body	Pin pushed	10 kΩ or higher

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY - MAIN BODY ECU)

(a) Disconnect the O5*1 or N5*2 front door courtesy light switch assembly connector.

(b) Remove the main body ECU (multiplex network body ECU) (See page ).

*1: for LH
*2: for RH

Standard Resistance:

for LH

Tester Connection	Condition	Specified Condition
O5-1 - 2F-27	Always	Below 1 Ω
O5-1 - Body ground	Always	10 kΩ or higher

for RH

Tester Connection	Condition	Specified Condition
N5-1 - 2B-15	Always	Below 1 Ω
N5-1 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY

(a) Remove the driver side junction block assembly (See page ).

Text in Illustration

Component without harness connected

(Driver Side Junction Block Assembly)

(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

Standard Resistance:

Tester Connection	Condition	Specified Condition
2F-27 - A-2 (FLCY)	Always	Below 1 Ω
2B-15 - A-4 (FRCY)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY

5.	INSPECT REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (LH OR RH)

(a) Remove the rear door courtesy light switch assembly (See page ).

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

Text in Illustration

*a	Component without harness connected (Rear Door Courtesy Light Switch Assembly)

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
1 - Switch body	Pin not pushed	Below 1 Ω
1 - Switch body	Pin pushed	10 kΩ or higher

REPLACE REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY

6.	CHECK HARNESS AND CONNECTOR (REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY - MAIN BODY ECU)

(a) Disconnect the O6*1 or N7*2 rear door courtesy light switch assembly connector.

(b) Disconnect the F8 or F10 main body ECU (multiplex network body ECU) connector.

*1: for LH
*2: for RH

Standard Resistance:

for LH

Tester Connection	Condition	Specified Condition
O6-1 - F8-3 (LCTY)	Always	Below 1 Ω
O6-1 - Body ground	Always	10 kΩ or higher

for RH

Tester Connection	Condition	Specified Condition
N7-1 - F10-27 (RCTY)	Always	Below 1 Ω
N7-1 - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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