Toyota 4Runner manuals

Toyota 4Runner: 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


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.
  • 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 )


OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - SPIRAL CABLE SUB-ASSEMBLY)


NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY

Black Screen
PROCEDURE 1. CHECK DISPLAY SETTING (a) Check that the display is not in screen off mode. OK: The display setting is not in screen off mode. NG ...

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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 CAU ...

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