LIGHTING SYSTEM Rear Fog Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the rear fog light.

WIRING DIAGRAM

B004B14E03

CAUTION / NOTICE / HINT

Note


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

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

  • First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CXPI communication malfunctions before troubleshooting this symptom.

    Click here

  • First, confirm that there is no malfunction in the power integration system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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  • When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here

PROCEDURE


  1. READ VALUE USING GTS


    1. Turn the rear fog light switch on.

    2. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Rear Fog Light Fuse Rear fog light fuse Connect or Disconnect

      Connect: Fuse not shut off

      Disconnect: Fuse shut off

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Status of Rear Fog Light Fuse
      OK
      The Data List value displays "Connect".
      Result
      Proceed to
      OK
      NG

    NG

    CHECK BACK-UP LIGHT ASSEMBLY Click here

    OK

  2. READ VALUE USING GTS


    1. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Rear Fog Light Input Signal Rear fog light switch input signal OFF or ON

      OFF: Rear fog light switch off

      ON: Rear fog light switch on

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Rear Fog Light Input Signal
      OK
      Display changes according to the rear fog light switch operation.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

  3. READ VALUE USING GTS


    1. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Rear Fog Light Output Signal Rear fog light output condition OFF or ON

      OFF: Rear fog light not illuminated

      ON: Rear fog light illuminated

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Rear Fog Light Output Signal
      OK
      Display changes according to the rear fog light switch operation.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    OK

  4. INSPECT BACK-UP LIGHT ASSEMBLY


    1. B0049WCE01

      Remove the back-up light assembly connector.

      Click here

    2. Apply auxiliary battery voltage to the connector and check the illumination conditions.

      OK
      Auxiliary Battery Connection Specified Condition

      Positive (+) → 1 (B)

      Negative (-) → 2 (E)

      		 Rear fog light illuminates
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BACK-UP LIGHT ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (BACK-UP LIGHT ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU AND BODY GROUND)


    1. Disconnect the c6 back-up light assembly connector.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal.

    3. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c6-1 (B) - X99-18 (L) Always Below 1 Ω
      c6-2 (E) - Body ground Always Below 1 Ω

    5. Connect the cable to the negative (-) auxiliary battery terminal.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Click here

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      c6-1 (B) or X99-18 (L) - Body ground Always Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. CHECK BACK-UP LIGHT ASSEMBLY


    1. Disconnect the c6 back-up light assembly connector.

    2. Turn the rear fog light switch off.

    3. Turn the rear fog light switch on.

    4. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Rear Fog Light Fuse Rear fog light fuse Connect or Disconnect

      Connect: Fuse not shut off

      Disconnect: Fuse shut off

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Status of Rear Fog Light Fuse
      OK
      The Data List value displays "Connect".
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BACK-UP LIGHT ASSEMBLY Click here

    NG

  7. CHECK HARNESS AND CONNECTOR (BACK-UP LIGHT ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the c6 back-up light assembly connector.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal.

    3. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c6-1 (B) or X99-18 (L) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR