Toyota 4Runner: Illumination Circuit

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Navigation / Multi Info Display / Navigation System / Illumination Circuit

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System (See page ).

Inspect the fuse for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK ILLUMINATION

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

Result	Proceed to
Illumination comes on for all components except steering pad switch assembly.	A
Illumination comes on for all components except navigation receiver assembly.	B
Illumination comes on only for steering pad switch assembly.	C
No illumination comes on (navigation receiver assembly, hazard switch, heater control switch, etc.).	D

GO TO STEP 5

GO TO METER / GAUGE SYSTEM

GO TO LIGHTING SYSTEM

2.	CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(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 in the tail or head position	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT STEERING PAD SWITCH ASSEMBLY

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

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

REPLACE STEERING PAD SWITCH ASSEMBLY

4.	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.
As the spiral cable sub-assembly may break, do not rotate the spiral cable sub-assembly more than the specified amount.

HINT:

Removal (See page )

Installation (See page )

REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND)

REPLACE SPIRAL CABLE SUB-ASSEMBLY

5.	CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)

(a) Disconnect the G6 navigation receiver assembly connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
G6-10 (ILL+) - Body ground	Light control switch in the tail or head position	11 to 14 V

Text in Illustration

*a	Component without harness connected (Navigation Receiver Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the G5 navigation receiver assembly connector.

(b) Disconnect the F14 combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G5-5 (ILL-) - F14-11 (ILL-)	Always	Below 1 Ω
G5-5 (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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