AUDIO AND VISUAL SYSTEM (for Radio Receiver Type) Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly to the radio 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 the switch is continuously depressed occurs.

Therefore, the radio receiver assembly cannot be operated using the steering pad switch assembly, and the radio receiver assembly itself cannot function.

WIRING DIAGRAM

A01DZQBE09

INSPECTION PROCEDURE

CAUTION:

The vehicle is equipped with an 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 SRS Click here.

PROCEDURE


  1. INSPECT STEERING PAD SWITCH ASSEMBLY


    1. Remove the steering pad switch assembly Click here.

      A01DZZ1E01
      Text in Illustration
      *1 Volume+ Switch *2 Volume- Switch
      *3 Seek- Switch *4 Seek+ Switch
      *5 MODE Switch - -

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      10 (AU1) - 8 (EAU) No switch is pushed 95 to 105 kΩ
      Seek+ switch is pushed Below 2.5 Ω
      Seek- switch is pushed 312.6 to 345.5 Ω
      Volume+ switch is pushed 950 to 1050 Ω
      Volume- switch is pushed 2954.5 to 3265.5 Ω
      9 (AU2) - 8 (EAU) No switch is pushed 95 to 105 kΩ
      MODE switch is pushed Below 2.5 Ω

    NG

    REPLACE STEERING PAD SWITCH ASSEMBLY Click here

    OK

  2. INSPECT SPIRAL CABLE SUB-ASSEMBLY


    1. A01E10ZE01
      Text in Illustration
      *a Steering Pad Switch Side
      *b Vehicle Side

      Remove the spiral cable sub-assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      8 (EAU) - 4 (EAU) Spiral cable is turned 2.5 rotations counterclockwise Below 1 Ω
      Spiral cable is centered
      Spiral cable is turned 2.5 rotations clockwise
      10 (AU1) - 6 (AU1) Spiral cable is turned 2.5 rotations counterclockwise
      Spiral cable is centered
      Spiral cable is turned 2.5 rotations clockwise
      9 (AU2) - 5 (AU2) Spiral cable is turned 2.5 rotations counterclockwise
      Spiral cable is centered
      Spiral cable is turned 2.5 rotations clockwise

      CAUTION:

      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.


    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - SPIRAL CABLE)


    1. Disconnect the R17 radio receiver assembly connector.

    2. Disconnect the S42 spiral cable sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R17-21 (SW1) - S42-6 (AU1) Always Below 1 Ω
      R17-22 (SW2) - S42-5 (AU2)
      R17-23 (SWG) - S42-4 (EAU)
      R17-21 (SW1) - Body ground Always 10 kΩ or higher
      R17-22 (SW2) - Body ground
      R17-23 (SWG) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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