Toyota 4Runner: Steering Pad Switch Circuit

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Navigation / Multi Info Display / Navigation System / Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly to the navigation receiver assembly.

If there is an open in the circuit, the audio system cannot be operated using the steering pad switch assembly.

If there is a short in the circuit, the same condition as when a switch is continuously depressed occurs.

Therefore, the navigation receiver assembly cannot be operated using the steering pad switch assembly, and also the navigation receiver assembly itself cannot function.

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 ).

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (STEERING PAD SWITCH SIGNAL)

(a) Disconnect the G37 navigation receiver assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G37-21 (SW1) - G37-23 (SWG)	No switch pushed	95 to 105 kΩ
	Up switch pushed	Below 2.5 Ω
	Down switch pushed	313 to 345 Ω
	Volume+ switch pushed	950 to 1050 Ω
	Volume- switch pushed	2955 to 3265 Ω
G37-22 (SW2) - G37-23 (SWG)	No switch pushed	95 to 105 kΩ
	MODE/HOLD switch pushed	Below 2.5 Ω
	On hook switch pushed	313 to 345 Ω
	Off hook switch pushed	950 to 1050 Ω
	Voice switch pushed	2955 to 3265 Ω
G37-24 (SW3) - G37-23 (SWG)	No switch pushed	95 to 105 kΩ
	Enter switch pushed	Below 2.5 Ω
	Back switch pushed	313 to 345 Ω
	Right switch pushed	950 to 1050 Ω
	Left switch pushed	2955 to 3265 Ω

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	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

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.
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 (NAVIGATION RECEIVER ASSEMBLY - SPIRAL CABLE SUB-ASSEMBLY)

REPLACE SPIRAL CABLE SUB-ASSEMBLY

Black Screen

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Illumination Circuit

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