AUDIO AND VISUAL SYSTEM > Steering Pad Switch Circuit

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DESCRIPTION

This circuit sends an operation signal from the steering pad switch to the radio receiver.
If there is an open in the circuit, the audio system cannot be operated by the steering pad switch.
If there is a short in the circuit, the same condition as that when the switch is continuously depressed occurs.
Therefore, the radio receiver cannot be operated by the steering pad switch, and also the radio receiver itself cannot function.

WIRING DIAGRAM


E110885E01


INSPECTION PROCEDURE

NOTICE:
The vehicle is equipped with an SRS (Supplemental Restraint System) such as airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the Supplemental Restraint System (Click here).

1.INSPECT RADIO RECEIVER


    E110928E04

  1. Disconnect the radio receiver connector R4.

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

    Standard resistance:
    Tester connection
    		Condition
    		Specified condition
    SW1 - SWG
    		No switch is pushed
    		Approx. 100 kΩ
    SW1 - SWG
    		SEEK+ switch: push
    		Approx. 0 Ω
    SW1 - SWG
    		SEEK- switch: push
    		Approx. 0.3 kΩ
    SW1 - SWG
    		VOL+ switch: push
    		Approx. 1 kΩ
    SW1 - SWG
    		VOL- switch: push
    		Approx. 3.2 kΩ
    SW2 - SWG
    		No switch is pushed
    		Approx. 100 kΩ
    SW2 - SWG
    		MODE switch: push
    		Approx. 0 Ω



NG
Go to step 2
OK

RETURN TO THE ORIGINAL INSPECTION FLOW BECAUSE THE CHECK RESULT IS NORMAL 

2.INSPECT STEERING PAD SWITCH LH

  1. Disconnect the steering pad switch LH connector.



  1. Measure the resistance according to the values in the table below.


    I035645E01


    Standard resistance:

    Tester connection
    		Condition
    		Specified condition
    AU1 - EAU
    		No switch is pushed
    		Approx. 100 kΩ
    AU1 - EAU
    		SEEK+ switch: push
    		Approx. 0 Ω
    AU1 - EAU
    		SEEK- switch: push
    		Approx. 0.3 kΩ
    AU1 - EAU
    		VOL+ switch: push
    		Approx. 1 kΩ
    AU1 - EAU
    		VOL- switch: push
    		Approx. 3.2 kΩ
    AU2 - EAU
    		No switch is pushed
    		Approx. 100 kΩ
    AU2 - EAU
    		MODE switch: push
    		Approx. 0 Ω



NG
REPLACE STEERING PAD SWITCH LH
OK


3.INSPECT SPIRAL CABLE


    I039337E03

  1. Disconnect the steering pad switch and spiral cable connectors.

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

    Standard resistance:
    Tester connection
    		Condition
    		Specified condition
    EAU - EAU
    		Always
    		Below 1 Ω
    AU1 - AU1
    		Always
    		Below 1 Ω
    AU2 - AU2
    		Always
    		Below 1 Ω



OK
REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE - RADIO RECEIVER)
NG

REPLACE SPIRAL CABLE