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

      B: Go to step  6

      C: GO TO LIGHTING SYSTEM  (See LIGHTING SYSTEM )

      D: GO TO METER / GAUGE SYSTEM  (See METER / GAUGE SYSTEM )

      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 SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      E10-12 (IL+2) -Body ground Light control switch TAIL or HEAD 11 to 14 V
      Fig 1: Identifying E10 Spiral Cable Connector
      G06035706Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      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 SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      Y1-8 (EAU) - E10-4 (EAU) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      Y1-5 (IL+2) - E10-12 (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 pages shown in the brackets.

      HINT:

      • Removal (See REMOVAL )
      • Installation (See INSTALLATION )
        Fig 3: Identifying Y1 Steering Pad Switch And E10 Spiral Cable Connectors
        G06035708Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        NG: REPLACE SPIRAL CABLE  (See REMOVAL )

        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 SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      E32-6 (SWG) - E10-4 (EAU) Always Below 1 Ω
      E32-6 (SWG) - Body ground Always 10 kΩ or higher
      Fig 4: Identifying E10 Spiral Cable And E32 Radio Receiver Connectors
      G06035709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      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 SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      E40-2 (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 7 Speakers
      (2) Except for 7 Speakers
      Fig 5: Identifying Radio Receiver Connectors
      G06035710Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      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 SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      E40-12 (ILL-) - E55-29 (ILL-)(1) Always Below 1 Ω
      E2-5 (ILL-) - E55-29 (ILL-)(2) Always Below 1 Ω
      E55-11 (EP) - Body ground Always Below 1 Ω
      E55-29 (ILL-) - Body ground Always 10 kΩ or higher
      (1) for 7 Speakers
      (2) Except for 7 Speakers
      Fig 6: Identifying Radio Receiver And Combination Meter Connectors
      G06035711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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