AUDIO AND VISUAL SYSTEM > Steering Pad Switch Circuit

for Preparation Click here


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 using the steering pad switch.
If there is a short in the circuit, the same condition as when a switch is continuously depressed occurs.
Therefore, the radio receiver cannot be operated using the steering pad switch, and also the radio receiver itself cannot function.

WIRING DIAGRAM


E176042E01


INSPECTION PROCEDURE

NOTICE:
The vehicle is equipped with SRS (Supplemental Restraint System) which includes components 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 ASSEMBLY


    E176043E01

  1. Disconnect the D63 radio receiver assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D63-7 (SW1) - D63-6 (SWG)
    		No switch is pushed
    		95 to 105 kΩ
    Seek+ switch: pushed
    		Below 2.5 Ω
    Seek- switch: pushed
    		312.5 to 345.5 Ω
    Volume+ switch: pushed
    		950 to 1050 Ω
    Volume- switch: pushed
    		2954.5 to 3265.5 Ω
    D63-8 (SW2) - D63-6 (SWG)
    		No switch is pushed
    		95 to 105 kΩ
    MODE/PWR switch: pushed
    		Below 2.5 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Radio Receiver Assembly)

  1. Reconnect the radio receiver assembly connector.



NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

2.INSPECT STEERING PAD SWITCH LH


  1. Disconnect the V1 steering pad switch LH connector.


    E176044E01


    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Steering Pad Switch LH)

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    V1-10 (AU1) - V1-8 (EAU)
    		No switch is pushed
    		95 to 105 kΩ
    Seek+ switch: pushed
    		Below 2.5 Ω
    Seek- switch: pushed
    		312.5 to 345.5 Ω
    Volume+ switch: pushed
    		950 to 1050 Ω
    Volume- switch: pushed
    		2954.5 to 3265.5 Ω
    V1-9 (AU2) - V1-8 (EAU)
    		No switch is pushed
    		95 to 105 kΩ
    MODE/PWR switch: pushed
    		Below 2.5 Ω

  1. Reconnect the steering pad switch LH connector.



NG
REPLACE STEERING PAD SWITCH LH (Click here)
OK


3.INSPECT SPIRAL CABLE SUB-ASSEMBLY


    E170601E04

  1. Disconnect the V1 steering pad switch LH connector.

  1. Disconnect the D19 spiral cable sub-assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    V1-8 (EAU) - D19-4 (EAU)
    		Center
    		Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
    V1-10 (AU1) - D19-6 (AU1)
    		Center
    		Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
    V1-9 (AU2) - D19-5 (AU2)
    		Center
    		Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right

    Text in Illustration 
    *1
    		Component without harness connected
    (Spiral Cable Sub-Assembly)

    NOTICE:
    The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the precaution for the SRS (Click here).

  1. Reconnect the steering pad switch LH connector.

  1. Reconnect the spiral cable sub-assembly connector.



NG
REPLACE SPIRAL CABLE SUB-ASSEMBLY (Click here)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR