Toyota 4Runner manuals

Toyota 4Runner: 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)


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT STEERING PAD SWITCH ASSEMBLY

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


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



NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

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 )


OK

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


NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY

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