Toyota 4Runner: Steering Pad Switch Circuit

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Audio / Video / Audio And Visual System / Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly to the radio and display receiver assembly.

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

If there is a short in the circuit, the resulting condition is the same as if a switch were continuously pressed. Therefore, the radio and display receiver assembly cannot be operated using the steering pad switch assembly, and the radio and display receiver assembly itself cannot function.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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.	INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Disconnect the G49 radio and display receiver assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G49-21 (SW1) - G49-23 (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
G49-22 (SW2) - G49-23 (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
G49-24 (SW3) - G49-23 (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

Text in Illustration

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

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.

HINT:

Removal (See page )

Installation (See page )

REPAIR OR REPLACE HARNESS OR CONNECTOR (RADIO AND DISPLAY RECEIVER - SPIRAL CABLE SUB-ASSEMBLY)

REPLACE SPIRAL CABLE SUB-ASSEMBLY

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