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Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Corolla. 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 AIRBAG SYSTEM ).
  1. CHECK ILLUMINATION 
    1. Check if the illumination for the navigation receiver assembly, steering pad switch, glove box 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 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 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 switch in TAIL or HEAD 11 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying Spiral Cable Connector Terminal
    G06010764Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 

    RESISTANCE REFERENCE

    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 cause airbag deployment. Be sure to read the page shown in the brackets.

    HINT:

    NG: REPLACE SPIRAL CABLE  (See REMOVAL )

    Fig 2: Identifying Steering Pad Switch Connector Terminal
    G06010765Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  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 

    RESISTANCE REFERENCE

    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 3: Identifying Navigation Receiver Assembly Connector Terminal And Spiral Cable Connector Terminal
    G06010766Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 

    VOLTAGE SPECIFICATION

    Tester Connection Condition Specified Condition
    E1-10 (ILL+) - Body ground Light control switch in TAIL or HEAD 11 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 5: Identifying Navigation Receiver Assembly Connector Terminal
    G06010768Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 

    RESISTANCE REFERENCE

    Tester Connection Condition Specified Condition
    E2-5 (ILL-) - E46-29 (ILL-) Always Below 1 Ω
    E2-5 (ILL-) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 6: Identifying Combination Meter Connector Terminal
    G06010769Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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