Toyota 4Runner: Illumination Circuit

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Audio / Video / Audio And Visual System / Illumination Circuit

DESCRIPTION

Power is supplied to the radio and display receiver assembly and steering pad switch illumination when the light control switch is in the tail or head position.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.
The vehicle is equipped with an SRS (Supplemental Restraint System). Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System (See page ).

PROCEDURE

1.	CHECK ILLUMINATION

(a) Check if the illumination for the radio and display receiver assembly, steering pad switch assembly, glove box or others (hazard switch, transmission control switch, etc.) comes on when the light control switch is turned to the tail or head position.

Result	Proceed to
Illumination comes on for all components except steering pad switch assembly.	A
Illumination comes on for all components except radio and display receiver assembly.	B
Illumination comes on for all components except radio and display receiver assembly and steering pad switch assembly.	C
No illumination comes on (radio and display receiver assembly, steering pad switch assembly, hazard switch, glove box, etc.).	D

GO TO STEP 5

GO TO METER / GAUGE SYSTEM

GO TO LIGHTING SYSTEM

2.	CHECK HARNESS AND CONNECTOR (BATTERY - SPIRAL CABLE SUB-ASSEMBLY)

(a) Disconnect the F23 spiral cable sub-assembly connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F23-12 (IL+2) - Body ground	Light control switch at tail or head	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Spiral Cable Sub-assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT SPIRAL CABLE SUB-ASSEMBLY

(a) Inspect the spiral cable sub-assembly (See page ).

NOTICE:

The spiral cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable sub-assembly may prevent the airbag from deploying. Refer to the pages shown in the brackets.

HINT:

Removal (See page )

Installation (See page )

REPLACE SPIRAL CABLE SUB-ASSEMBLY

4.	INSPECT STEERING PAD SWITCH ASSEMBLY

(a) Remove the steering pad switch assembly (See page ).

(b) Inspect the steering pad switch assembly (See page ).

HINT:

Only perform "Check the illumination".

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE STEERING PAD SWITCH ASSEMBLY

5.	CHECK HARNESS AND CONNECTOR (BATTERY - RADIO AND DISPLAY RECEIVER)

(a) Disconnect the G48 radio and display receiver assembly connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
G48-10 (ILL+) - Body ground	Light control switch at tail or head	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Radio and Display Receiver Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER - COMBINATION METER ASSEMBLY)

(a) Disconnect the G47 radio and display receiver assembly connector.

(b) Disconnect the F14 combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G47-5 (ILL-) - F14-11 (ILL-)	Always	Below 1 Ω
G47-5 (ILL-) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

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