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Home >> Lexus >> 2008 >> SC 430 >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Audio/Visual >> Audio And Visual System >> Steering Pad Switch Circuit >> Inspection Procedure

Inspection Procedure

  1. READ VALUE OF TECHSTREAM (STEERING PAD SWITCH MODULATOR) 
    1. Check the DATA LIST for proper functioning of the steering pad switch.

      Steering pad switch modulator: 

      DATA LIST

      Tester Display Test Part Control Range Diagnostic Note
      AV MODE SW Audio mode switch / ON or OFF ON: Audio mode switch is pushed
      OFF: Audio mode switch is not pushed
      -
      AV VOL UP SW Audio volume UP switch / ON or OFF ON: Audio volume UP switch is pushed
      OFF: Audio volume UP switch is not pushed
      -
      AV VOL DOWN SW Audio volume DOWN switch / ON or OFF ON: Audio volume DOWN switch is pushed
      OFF: Audio volume DOWN switch is not pushed
      -
      AV SEL UP SW Audio selector UP switch / ON or OFF ON: Audio selector UP switch is pushed
      OFF: Audio selector UP switch is not pushed
      -
      AV SEL DOWN SW Audio selector DOWN switch / ON or OFF ON: Audio selector DOWN switch is pushed
      OFF: Audio selector DOWN switch is not pushed
      -
      AV VOL SET SW Audio volume set switch / ON or OFF ON: Audio volume set switch is pushed
      OFF: Audio volume set switch is not pushed
      -
      VOICE HOOK SW* Speech recognition hook switch / ON or OFF ON: Speech recognition hook switch is pushed
      OFF: Speech recognition hook switch is not pushed
      -
      HINT:
      *: w/ Navigation System

      OK: 

      ON appears on the screen when each steering pad switch is pushed. 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

    NG: Go to next step 

  2. REPLACE STEERING PAD SWITCH MODULATOR 
    1. Replace steering pad switch.
    2. Check if the vehicle is equipped with a navigation system.

      Result 

      RESULT CHART

      Result Proceed to
      w/ Navigation system A
      w/o Navigation system B

    B: END 

    A: Go to next step 

  3. RESET STEERING PAD SWITCH MODULATOR 
    1. The following procedure must be completed within 30 seconds:
      1. Turn the ignition switch to ACC.
      2. Press the "Mode" button for at least 10 seconds.
      3. Within 5 seconds, press channel up twice and channel down twice.

    NEXT: END