Audio And Visual System Steering Pad Switch Circuit

Body Electrical. Lexus Gs430, Gs300. Uzs190 Grs190
Audio Visual. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK RADIO RECEIVER ASSEMBLY

INSPECT STEERING PAD SWITCH ASSEMBLY

INSPECT SPIRAL CABLE

AUDIO AND VISUAL SYSTEM - Steering Pad Switch Circuit


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


Lexus Gs430, Gs300. Uzs190 Grs190.Audio Visual.Audio And Visual System.Audio And Visual System Steering Pad Switch Circuit


INSPECTION PROCEDURE

1.CHECK RADIO RECEIVER ASSEMBLY
Lexus Gs430, Gs300. Uzs190 Grs190.Audio Visual.Audio And Visual System.Audio And Visual System Steering Pad Switch Circuit

  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


    Lexus Gs430, Gs300. Uzs190 Grs190.Audio Visual.Audio And Visual System.Audio And Visual System Steering Pad Switch Circuit

  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
Lexus Gs430, Gs300. Uzs190 Grs190.Audio Visual.Audio And Visual System.Audio And Visual System Steering Pad Switch Circuit

  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