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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The vehicle is equipped with an SRS (Supplemental Restraint System). Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the Supplemental Restraint System (See PRECAUTION ).
  1. CHECK ILLUMINATION 
    1. Check if the illumination for the radio receiver, steering pad switch, cigarette lighter, glove box light or others (transmission control SW, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.

      Result 

      RESULT REFERENCE

      Result Proceed to
      Illumination comes on for all components except steering pad switch. A
      Illumination comes on for all components except radio receiver. B
      No illumination comes on (radio receiver, steering pad switch, cigarette lighter, glove box light, transmission control switch). C
      No illumination comes on for any component except glove box light. D

    B:  Go to step  6

    C:  Go to LIGHTING SYSTEM

    D:  Go to COMBINATION METER SYSTEM

    A: Go to Next Step 

  2. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - BATTERY) 
    1. Disconnect the spiral cable connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      IL+2 - Body ground Light control SW TAIL or HEAD 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying Spiral Cable Connector Terminals
    G05006222Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  3. INSPECT STEERING PAD SWITCH ASSEMBLY 
    1. Disconnect the steering pad switch assembly connector.
      Fig 2: Identifying Steering Pad Switch Connector Terminals
      G05407757Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the positive (+) lead to terminal ILL+ and the negative (-) lead to terminal EAU of the steering pad switch assembly connector.
    3. Check if the illumination for the steering pad switch assembly comes on.

      OK: Illumination for the steering pad switch assembly comes on. 

    NG: REPLACE STEERING PAD SWITCH ASSEMBLY 

    OK: Go to Next Step 

  4. INSPECT SPIRAL CABLE 
    1. Disconnect the spiral cable connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      EAU - EAU Always Below 1 Ω
      IL+2 - IL+2 Always Below 1 Ω

    NG: REPLACE SPIRAL CABLE 

    Fig 3: Identifying Spiral Cable Connector Terminals
    G05006224Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - RADIO RECEIVER) 
    1. Disconnect the radio receiver connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connector Condition Specified Condition
      GND - EAU Always Below 1 Ω
      GND - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 4: Disconnecting Radio Receiver Connectors
    G05407759Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : REPLACE RADIO RECEIVER 

  6. INSPECT RADIO RECEIVER 
    1. Disconnect the radio receiver connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connector Condition Specified Condition
      ILL+ - Body ground Light control switch TAIL or HEAD 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 5: Disconnecting Radio Receiver Connectors
    G05407760Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  7. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER) 
    1. Disconnect the radio receiver connector and the combination meter connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connector Condition Specified Condition
      ILL- - ILL- Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 6: Disconnecting Radio Receiver Connector And Combination Meter Connector
    G05407761Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:  Go to COMBINATION METER SYSTEM

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