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Home >> Toyota >> 2008 >> Corolla LE, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 49 (Navigation System) >> Navigation System >> Illumination Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Camry Solara. 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) such as the airbags. 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 CHART

      Condition 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 (navigation receiver, hazard switch, glove box, etc.) C
      Illumination comes on only for glove box and steering pad switch. D

    B: Go to step  6

    C:  Go TO LIGHTING SYSTEM

    D: A GO TO  COMBINATION METER 

    A: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (BATTERY - SPIRAL CABLE) 
    Fig 1: Checking Harness And Connector (Battery - Spiral Cable)
    G04980949Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the spiral cable connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      IL+2 - Body ground Light control switch TAIL or HEAD 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK STEERING PAD SWITCH ASSEMBLY 
    1. Disconnect the steering pad switch assembly connector.
      Fig 2: Checking Steering Pad Switch Assembly
      G05135522Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the positive (+) lead to terminal ILL+ and the negative (-) lead to terminal 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 assembly comes on. 

    NG: REPLACE STEERING PAD SWITCH ASSEMBLY 

    OK: Go to next step 

  4. INSPECT SPIRAL CABLE 
    Fig 3: Inspecting Spiral Cable
    G04980951Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Spiral cable position Specified Condition
      EAU - EAU Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      ILL+ - 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 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 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - NAVIGATION RECEIVER ASSEMBLY) 
    Fig 4: Checking Harness And Connector (Spiral Cable - Navigation Receiver Assembly)
    G05135524Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      SWG - EAU Always Below 1 Ω
      SWG - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE NAVIGATION RECEIVER ASSEMBLY 

  6. CHECK HARNESS AND CONNECTOR (BATTERY - NAVIGATION RECEIVER ASSEMBLY) 
    Fig 5: Checking Harness And Connector (Battery - Navigation Receiver Assembly)
    G05135525Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the navigation receiver assembly connector R7.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      ILL+ - Body ground Light control switch TAIL or HEAD 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY COMBINATION METER) 
    Fig 6: Checking Harness And Connector (Navigation Receiver Assembly Combination Meter)
    G05135526Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the navigation receiver assembly and combination meter connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      ILL- - ILL- Always Below 1 Ω
      ILL- - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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