NAVIGATION SYSTEM(for HDD) Steering Pad Switch Circuit

DTC Code DTC Name
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

E269542E05

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.

Click here

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.

      Click here

    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 hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR