LIGHTING SYSTEM(for Triple Beam Headlight) Daytime Running Light Relay Circuit

DESCRIPTION

The illumination of the daytime running lights and clearance lights is controlled by the headlight ECU sub-assembly LH and RH.

WIRING DIAGRAM

B004GMHE16

CAUTION / NOTICE / HINT

Note


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

  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

    Click here

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / AutoLeveling / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > HL AutoLeveling > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Clearance Light Clearance lights ON or OFF -
      Daytime Running Light Daytime running lights ON or OFF -

      Body Electrical > HL AutoLeveling > Active Test
      Tester Display
      Clearance Light

      Body Electrical > HL AutoLeveling > Active Test
      Tester Display
      Daytime Running Light
      OK
      Clearance lights and daytime running lights illuminate.
      Result
      Result Proceed to
      OK A
      NG (for LH Side) B
      NG (for RH Side) C

    A

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

    C

    CHECK HARNESS AND CONNECTOR (CLEARANCE LIGHT ASSEMBLY RH - POWER SOURCE AND BODY GROUND) Click here

    B

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE LIGHT ASSEMBLY LH - POWER SOURCE AND BODY GROUND)


    1. Disconnect the A32 clearance light assembly LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A32-3 (DRL) - Body ground Light control switch in tail or head position 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A32-2 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - CLEARANCE LIGHT ASSEMBLY LH)


    1. Disconnect the A36 headlight ECU sub-assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A36-8 (RLD2) - A32-4 (DRLC) Always Below 1 Ω
      A36-8 (RLD2) or A32-4 (DRLC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT CLEARANCE LIGHT ASSEMBLY LH


    1. Remove the clearance light assembly LH.

      Click here

    2. Inspect the clearance light assembly LH.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    NG

  5. INSPECT CLEARANCE LIGHT ASSEMBLY LH


    1. Remove the clearance light assembly LH.

      Click here

    2. Remove the clearance LED unit assembly LH from the clearance light assembly LH.

      Click here

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

      B004EWLC06
      *a

      Component without harness connected

      (Clearance Light Assembly LH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A32-2 (E) - A-2 Always Below 1 Ω
      A32-3 (DRL) - A-4 Always Below 1 Ω
      A32-4 (DRLC) - A-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CLEARANCE LIGHT LED UNIT ASSEMBLY LH Click here

    NG

    REPLACE CLEARANCE LIGHT ASSEMBLY LH Click here

  6. CHECK HARNESS AND CONNECTOR (CLEARANCE LIGHT ASSEMBLY RH - POWER SOURCE AND BODY GROUND)


    1. Disconnect the A3 clearance light assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A3-3 (DRL) - Body ground Light control switch in tail or head position 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A3-2 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - CLEARANCE LIGHT ASSEMBLY RH)


    1. Disconnect the A7 headlight ECU sub-assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-8 (RLD2) - A3-4 (DRLC) Always Below 1 Ω
      A7-8 (RLD2) or A3-4 (DRLC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT CLEARANCE LIGHT ASSEMBLY RH


    1. Remove the clearance light assembly RH.

      Click here

    2. Inspect the clearance light assembly RH.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    NG

  9. INSPECT CLEARANCE LIGHT ASSEMBLY RH


    1. Remove the clearance light assembly RH.

      Click here

    2. Remove the clearance light LED unit assembly RH from the clearance light assembly RH.

      Click here

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

      B004F7KC06
      *a

      Component without harness connected

      (Clearance Light Assembly RH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A3-2 (E) - A-2 Always Below 1 Ω
      A3-3 (DRL) - A-4 Always Below 1 Ω
      A3-4 (DRLC) - A-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CLEARANCE LIGHT LED UNIT ASSEMBLY RH Click here

    NG

    REPLACE CLEARANCE LIGHT ASSEMBLY RH Click here