NAVIGATION SYSTEM(for HDD) Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch assembly to the navigation ECU sub-assembly.

If there is an open in the circuit, the audio system cannot be operated using the steering pad switch assembly.

If there is a short in the circuit, the same condition as when a switch is continuously depressed occurs.

Therefore, the navigation ECU sub-assembly cannot be operated using the steering pad switch assembly, and also the navigation ECU sub-assembly itself cannot function.

WIRING DIAGRAM

A01CWXME05

CAUTION / NOTICE / HINT

Note

The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

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PROCEDURE


  1. INSPECT STEERING PAD SWITCH ASSEMBLY


    1. Remove the steering pad switch assembly.

      Click here

    2. Inspect the steering pad switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STEERING PAD SWITCH ASSEMBLY Click here

    OK

  2. INSPECT SPIRAL CABLE SUB-ASSEMBLY


    1. Remove the spiral cable sub-assembly.

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    2. Inspect the spiral cable sub-assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - SPIRAL CABLE SUB-ASSEMBLY)


    1. Disconnect the G139 navigation ECU sub-assembly connector.

    2. Disconnect the G8 spiral cable sub-assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      G139-21 (SW1) - G8-6 (AU1) Always Below 1 Ω
      G139-22 (SW2) - G8-5 (AU2) Always Below 1 Ω
      G139-23 (SWG) - G8-3 (EAU) Always Below 1 Ω
      G139-24 (SW3) - G8-4 (AU3) Always Below 1 Ω
      G139-21 (SW1) - Body ground Always 10 kΩ or higher
      G139-22 (SW2) - Body ground Always 10 kΩ or higher
      G139-23 (SWG) - Body ground Always 10 kΩ or higher
      G139-24 (SW3) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR