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Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT RADIO RECEIVER ASSEMBLY 
    1. Disconnect the R3 radio receiver assembly connector.
    2. Measure the resistance.

      Standard 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      SW1 (R3-7) - SWG (R3-6) No switch is pushed Approx. 100 k
      SW1 (R3-7) - SWG (R3-6) SEEK+ switch is pushed Approx. 0
      SW1 (R3-7) - SWG (R3-6) SEEK - switch is pushed Approx. 0.3 k
      SW1 (R3-7) - SWG (R3-6) VOL+ switch is pushed Approx. 1 k
      SW1 (R3-7) - SWG (R3-6) VOL - switch is pushed Approx. 3.1 k
      SW2 (R3-8) - SWG (R3-6) No switch is pushed Approx. 100 k
      SW2 (R3-8) - SWG (R3-6) MODE switch is pushed Approx. 0

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

    Fig 1: Identifying R3 Radio Receiver Assembly Connector Terminals
    G04412717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to next step 

  2. INSPECT STEERING PAD SWITCH LH (AU1, AU2, EAU) 
    Fig 2: Inspecting Steering Pad Switch LH
    G04412718Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the steering pad switch LH connector.
    2. Measure the resistance.

      Standard 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      AU1 - EAU No switch is pushed Approx. 100 k
      AU1 - EAU SEEK+ switch is pushed Approx. 0
      AU1 - EAU SEEK - switch is pushed Approx. 0.3 k
      AU1 - EAU VOL+ switch is pushed Approx. 1 k
      AU1 - EAU VOL - switch is pushed Approx. 3.1 k
      AU2 - EAU No switch is pushed Approx. 100 k
      AU2 - EAU MODE switch is pushed Approx. 0

    NG: REPLACE STEERING PAD SWITCH LH 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - RADIO RECEIVER ASSEMBLY) 
    1. Disconnect the S8 spiral cable sub-assembly connector.
    2. Disconnect the R3 radio receiver assembly connector.
    3. Check the resistance.

      Standard 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      SW1 (R3-7) - AU1 (S8-6) Below 1
      SW2 (R3-8) - AU2 (S8-5) Below 1
      SWG (R3-6) - EAU (S8-4) Below 1
      SW1 (R3-7) - Body ground 10 k or higher
      SW2 (R3-8) - Body ground 10 k or higher
      SWG (R3-6) - Body ground 10 k or higher

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 3: Identifying S8 Spiral Cable Sub-Assembly Connector Terminals
    G04412719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE SPIRAL CABLE SUB-ASSEMBLY 

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