NAVIGATION SYSTEM(for HDD) Illumination Circuit

DTC Code DTC Name
Illumination Circuit

DESCRIPTION

Power is supplied to the navigation ECU sub-assembly and steering pad switch assembly illumination when the light control switch is in the tail or head position.

WIRING DIAGRAM

E269544E04

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

  • Inspect the fuse for circuits related to this system before performing the following inspection procedure.

PROCEDURE

  1. CHECK ILLUMINATION

    1. Check if the illumination for the navigation ECU sub-assembly, steering pad switch assembly, heater control switch 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

      Proceed to

      Illumination comes on for all components except steering pad switch assembly.

      A

      Illumination comes on for all components except navigation ECU sub-assembly.

      B

      No illumination comes on (navigation ECU sub-assembly, hazard switch, heater control switch, etc.).

      C
    B

    CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - BATTERY AND BODY GROUND)Click here

    C

    GO TO LIGHTING SYSTEM

    Click here

    A

  2. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BATTERY AND BODY GROUND)

    1. E270420C01

      *a

      Front view of wire harness connector

      (to Spiral Cable Sub-assembly)

      Disconnect the spiral cable sub-assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G8-11 (-DP) - Body ground

      Always

      Below 1 Ω

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G8-13 (IL+2) - Body ground

      Light control switch in the tail or head position

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. 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

  4. 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
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY

    Click here

  5. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - BATTERY AND BODY GROUND)

    1. E259248C01

      *a

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly)

      Disconnect the navigation ECU sub-assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G137-7 (GND1) - Body ground

      Always

      Below 1 Ω

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G137-10 (ILL+) - Body ground

      Light control switch in the tail or head position

      11 to 14 V

    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