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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 Supplemental Restraint System (See AIRBAG SYSTEM ).
  1. CHECK ILLUMINATION 
    1. Check if the illumination for the radio receiver, steering pad switch, heater control switch or others (hazard switch, transmission control switch, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.

    Result 

    RESULT CHART

    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, hazard switch, heater control switch, etc.). C
    Illumination comes on only for hazard switch and steering pad switch. D

    B: Go to step 6 

    C: GO TO LIGHTING SYSTEM  (See PROBLEM SYMPTOMS TABLE )

    D: GO TO METER / GAUGE SYSTEM  (See PROBLEM SYMPTOMS TABLE )

    A: Go to Next Step 

  2. CHECK HARNESS AND CONNECTOR (BATTERY - SPIRAL CABLE) 
    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
    E6-12 (IL+2) - Body ground Light control SW TAIL or HEAD 11 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying Spiral Cable Connector
    G06010498Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  3. INSPECT STEERING PAD SWITCH ASSEMBLY 
    1. Disconnect the steering pad switch connector.
    2. Connect a battery positive (+) lead to terminal IL+2 and a negative (-) lead to terminal EAU of the steering pad switch assembly connector.
      Fig 2: Inspecting Steering Pad Switch Assembly
      G06010499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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  (See REMOVAL )

      OK: Go to Next Step 

  4. INSPECT SPIRAL CABLE 
    1. Disconnect the steering pad switch and the spiral cable connectors.
    2. Measure the resistance according to the value(s) in the table below.

    Standard Resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    Y1-8 (EAU) - E6-4 (EAU) Center Below 1 Ω
    2.5 rotations to the left
    2.5 rotations to the right
    Y1-5 (IL+2) - E6-12 (IL+2) 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 airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the page shown in the brackets.

    HINT:

    NG: REPLACE SPIRAL CABLE  (See REMOVAL )

    Fig 3: Identifying Steering Pad Switch And Spiral Cable Connectors
    G06010500Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

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

    Standard Resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    E26-6 (SWG) - E6-4 (EAU) Always Below 1 Ω
    E26-6 (SWG) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 4: Identifying Spiral Cable And Radio Receiver Connector
    G06010501Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  6. CHECK HARNESS AND CONNECTOR (BATTERY - 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 Connection Condition Specified Condition
    E103-2 (ILL*) - Body ground(1) Light control switch TAIL or HEAD 11 to 14 V
    E1-10 (ILL+) - Body ground(2) Light control switch TAIL or HEAD 11 to 14 V
    (1) for 8 Speakers
    (2) Except for 8 Speakers

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 5: Identifying Radio Receiver E103 And E1 Connector
    G06010502Courtesy 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 Connection Condition Specified Condition
      E103-12 (ILL-) - E46-29 (ILL-)(1) Always Below 1 Ω
      E2-5 (ILL-) - E46-29 (ILL-)(2) Always Below 1 Ω
      E46-11 (EP) - Body ground Always Below 1 Ω
      E46-29 (ILL-) - Body ground Always 10 kΩ or higher
      (1) for 8 Speakers
      (2) Except for 8 Speakers

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 6: Identifying Radio Receiver And Combination Meter Connector Terminals
      G06010503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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