NAVIGATION SYSTEM (for Radio and Display Type) Illumination Circuit

DESCRIPTION

Power is supplied to the radio and display receiver assembly and steering pad switch assembly illumination when the light control switch is in the tail or head position.

WIRING DIAGRAM

A01DPEHE04

INSPECTION PROCEDURE

CAUTION:

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 precautionary notice for the Supplemental Restraint System Click here.

Note

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

PROCEDURE


  1. CHECK ILLUMINATION


    1. Check if the illumination for the radio and display receiver 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 radio and display receiver assembly. B
      Illumination comes on for all components except steering pad switch assembly and radio and display receiver assembly. C
      No illumination comes on (radio and display receiver assembly, hazard switch, heater control switch, etc.). D

    B

    CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL) Click here

    C

    CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT SWITCH CONTROL ECU - SPIRAL CABLE SUB-ASSEMBLY AND BODY GROUND) Click here

    D

    GO TO LIGHTING SYSTEM (INT) Click here

    A

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


    1. A01DT64E57
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Spiral Cable Sub-assembly)

      Disconnect the spiral cable sub-assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G40-12 (IL+2) - Body ground Light control switch tail or head position 11 to 14 V

    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.


    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.


    NG

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - SPIRAL CABLE SUB-ASSEMBLY)


    1. Disconnect the H51 radio and display receiver assembly connector.

    2. Disconnect the G40 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
      H51-23 (SWG) - G40-4 (EAU) Always Below 1 Ω
      H51-23 (SWG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  6. CHECK HARNESS AND CONNECTOR (ILLUMINATION SIGNAL)


    1. A01DTAZE52
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Radio and Display Receiver Assembly)

      Disconnect the radio and display receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H49-7 (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
      H49-10 (ILL+) - Body ground Light control switch in the tail or head position 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  7. CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT SWITCH CONTROL ECU - SPIRAL CABLE SUB-ASSEMBLY AND BODY GROUND)


    1. Disconnect the G40 spiral cable sub-assembly connector.

    2. Disconnect the G76*1 or G163*2 driving support switch control ECU connector.


      • *1: for Manual Transmission

      • *2: for Automatic Transmission

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

      Standard Resistance
      for Manual Transmission
      Tester Connection Condition Specified Condition
      G40-10 (GND1) - G76-4 (SWI2) Always Below 1 Ω
      G76-16 (GND) - Body ground Always Below 1 Ω
      G76-4 (SWI2) - Body ground Always 10 kΩ or higher
      for Automatic Transmission
      Tester Connection Condition Specified Condition
      G40-10 (GND1) - G163-14 (SWI2) Always Below 1 Ω
      G163-7 (GND) - Body ground Always Below 1 Ω
      G163-14 (SWI2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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