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Inspection Procedure

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 notices for the Supplemental Restraint System (See AIRBAG SYSTEM ).
  1. CHECK ILLUMINATION 
    1. Check if the illumination for the navigation receiver assembly, steering pad switch, glove box and other components (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 navigation receiver assembly. B
      No illumination comes on (radio receiver, hazard switch, glove box, 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 

      STANDARD VOLTAGE REFERENCE CHART

      Tester Connection Condition Specified Condition
      E10-12 (IL+2) - Body ground Light control switch in TAIL or HEAD 11 to 14 V
      Fig 1: Identifying E10 Spiral Cable Connector
      G06035972Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

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

      Standard Resistance 

      STANDARD RESISTANCE REFERENCE CHART

      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
      Fig 2: Identifying Y1 Steering Pad Switch And E10 Spiral Cable Connectors
      G06035973Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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:

  4. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - NAVIGATION RECEIVER ASSEMBLY) 
    1. Disconnect the connectors from the navigation receiver assembly and spiral cable.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE REFERENCE CHART

      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 3: Identifying E32 Spiral Cable And E10 Navigation Receiver Assembly Connectors
      G06035974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

  5. INSPECT STEERING PAD SWITCH ASSEMBLY 
    1. Disconnect the steering pad switch assembly connector.
    2. Connect a positive (+) lead to terminal IL+2 and a negative (-) lead to terminal EAU of the steering pad switch connector.
      Fig 4: Inspecting Steering Pad Switch Assembly
      G06010767Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check if the illumination for the steering pad switch comes on.

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

      NG: REPLACE STEERING PAD SWITCH ASSEMBLY  (See REMOVAL )

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

  6. CHECK HARNESS AND CONNECTOR (BATTERY - NAVIGATION RECEIVER ASSEMBLY) 
    1. Disconnect the navigation receiver assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      STANDARD VOLTAGE REFERENCE CHART

      Tester Connection Condition Specified Condition
      E1-10 (ILL+) - Body ground Light control switch in TAIL or HEAD 11 to 14 V
      Fig 5: Identifying E1 Navigation Receiver Assembly Connector
      G06010768Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

  7. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - COMBINATION METER) 
    1. Disconnect the navigation receiver assembly connector.
    2. Disconnect the combination meter connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE REFERENCE CHART

      Tester Connection Condition Specified Condition
      E2-5 (ILL-) - E55-29 (ILL-) Always Below 1 Ω
      E2-5 (ILL-) - Body ground Always 10 kΩ or higher
      Fig 6: Identifying E2 Navigation Receiver Assembly And E55 Combination Meter Connectors
      G06035977Courtesy 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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