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Inspection Procedure

NOTE: 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 supplemental restraint system.
  1. CHECK ILLUMINATION 
    1. Check if the illumination for the radio receiver, steering pad switch, multi-display and other illuminations (hazard switch, etc.) come on when the light control switch is turned to the HEAD or TAIL position.

      Result 

      RESULT

      Result Proceed to
      Illumination comes on for all components except steering pad switch. A
      Illumination comes on for all components except radio receiver. B
      Illumination comes on for all components except multi-display. C
      No illumination comes on (radio receiver, hazard switch, multi-display, etc.). D

    B: Go to step  6

    C: Go to step  7

    D:  Go to METER / GAUGE SYSTEM

    A: Go to next step 

  2. CHECK WIRE HARNESS (BATTERY - SPIRAL CABLE) 
    1. Disconnect the C12 cable connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      STANDARD VOLTAGE

      Tester Connection Condition Specified Condition
      C12-12 (ILL+) - Body ground Light control switch TAIL or HEAD 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 1: Identifying C12 Cable Connector
    G05189861Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  3. INSPECT STEERING PAD SWITCH 
    Fig 2: Inspecting Steering Pad Switch
    G05189862Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the steering pad switch connector.
    2. Connect the battery's positive (+) lead to terminal 5 (ILL+) and the negative (-) lead to terminal 8 (EAU) of the steering pad switch connector.
    3. Check if the illumination for the steering pad switch comes on.

      OK: 

      Illumination for the steering pad switch comes on. 

    NG: REPLACE STEERING PAD SWITCH 

    OK: Go to next step 

  4. INSPECT SPIRAL CABLE 
    1. Disconnect the steering pad switch connector.
    2. Disconnect the spiral cable connector.
    3. Measure the resistance of the cable.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Spiral Cable Position Specified Condition
      C12-4 (EAU) - A-8 (EAU) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      C12-12 (ILL+) - A-5 (ILL+) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      NOTE: The spiral cable is an important part of the SRS. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the SRS section's precaution.

    NG: REPLACE SPIRAL CABLE 

    Fig 3: Identifying Spiral Cable Connector
    G05189863Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  5. CHECK WIRE HARNESS (SPIRAL CABLE - RADIO RECEIVER) 
    1. Disconnect the R5 receiver connector.
    2. Disconnect the C12 cable connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Specified Condition
      R5-6 (SWG) - C12-4(EAU) Below 1 Ω
      R5-6 (SWG) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 4: Identifying R5 Receiver Connector And C12 Cable Connector
    G05189864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE RADIO RECEIVER 

  6. CHECK WIRE HARNESS (BATTERY - RADIO RECEIVER) 
    1. Disconnect the R3*1 or R6*2 receiver connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      STANDARD VOLTAGE

      Tester Connection Condition Specified Condition
      R3-10 (ILL+) - Body ground*1 Light control switch TAIL or HEAD 10 to 14 V
      R6-2 (ILL+) - Body ground*2 Light control switch TAIL or HEAD 10 to 14 V
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Specified Condition
      R4-5 (ILL-) - Body ground*1 Below 1 Ω
      R6-12 (ILL-) - Body ground*2 Below 1 Ω
      HINT:
      • *1: for 6 speaker system
      • *2: for 9 speaker system

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 5: Identifying R3*1 Or R6*2 Receiver Connector
    G05189865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE RADIO RECEIVER 

  7. CHECK WIRE HARNESS (BATTERY - MULTI-DISPLAY) 
    1. Disconnect the M13 display connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      STANDARD VOLTAGE

      Tester Connection Condition Specified Condition
      M13-1 (ILL*) - Body ground*1 Light control switch TAIL or HEAD 10 to 14 V
      M13-12 (ILL+) - Body ground*2 Light control switch TAIL or HEAD 10 to 14 V
    3. Measure the resistance of the wire harness side connector.
      Fig 6: Identifying M13 Display Connector
      G05189866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Specified Condition
      M13-2 (ILL-) - Body ground*1 Below 1 Ω
      M13-11 (ILL-) - Body ground*2 Below 1 Ω
      HINT:
      • *1: for 3 connector type
      • *2: for 4 connector type

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE MULTI-DISPLAY 

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