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 assembly. 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 assembly cannot be operated by the steering pad switch, and also the radio receiver assembly itself does not function.

WIRING DIAGRAM


E110347E01


INSPECTION PROCEDURE

1.CHECK RADIO RECEIVER ASSEMBLY
E108289E05

  1. Disconnect the L56 receiver connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L56-7 (SW1) - L56-6 (SWG)
    		No switch is pushed
    		Approx. 100 kΩ
    L56-7 (SW1) - L56-6 (SWG)
    		SEEK+ switch: pushed
    		Approx. 0 Ω
    L56-7 (SW1) - L56-6 (SWG)
    		SEEK- switch: pushed
    		Approx. 0.3 kΩ
    L56-7 (SW1) - L56-6 (SWG)
    		VOL+ switch: pushed
    		Approx. 1 kΩ
    L56-7 (SW1) - L56-6 (SWG)
    		VOL- switch: pushed
    		Approx. 3.2 kΩ
    L56-8 (SW2) - L56-6 (SWG)
    		No switch is pushed
    		Approx. 100 kΩ
    L56-8 (SW2) - L56-6 (SWG)
    		MODE switch: pushed
    		Approx. 0 Ω



OK
REPLACE RADIO RECEIVER ASSEMBLY
NG


2.INSPECT STEERING PAD SWITCH ASSEMBLY


    E109846E01

  1. Remove the steering pad switch.

  1. Measure the resistance of the connector.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A-10 (AU1) - A-8 (EAU)
    		No switch is pushed
    		Approx. 100 kΩ
    A-10 (AU1) - A-8 (EAU)
    		SEEK+ switch: pushed
    		Approx. 0 kΩ
    A-10 (AU1) - A-8 (EAU)
    		SEEK- switch: pushed
    		Approx. 0.3 kΩ
    A-10 (AU1) - A-8 (EAU)
    		VOL+ switch: pushed
    		Approx. 1 kΩ
    A-10 (AU1) - A-8 (EAU)
    		VOL- switch: pushed
    		Approx. 3.2 kΩ
    A-9 (AU2) - A-8 (EAU)
    		No switch is pushed
    		Approx. 100 kΩ
    A-9 (AU2) - A-8 (EAU)
    		MODE switch: pushed
    		Approx. 0 kΩ



NG
REPLACE STEERING PAD SWITCH ASSEMBLY
OK


3.INSPECT SPIRAL CABLE
I039337E02

  1. Disconnect the A steering pad switch and L20 spiral cable connectors.

  1. Measure the resistance of the connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    L20-4 (EAU) - A-8 (EAU)
    		Below 1 Ω
    L20-6 (AU1) - A-10 (AU1)
    		Below 1 Ω
    L20-5 (AU2) - A-9 (AU2)
    		Below 1 Ω



NG
REPLACE SPIRAL CABLE
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE