LIGHTING SYSTEM Clearance Light/Daytime Running Light Circuit

DESCRIPTION

Clearance light function:

• When the main body ECU (multiplex network body ECU) receives the light control switch position signal, it sends an illumination request signal to the headlight ECU sub-assembly LH and illuminates the clearance lights.

Daytime running light function:

• When the operation conditions of the daytime running lights are met, the main body ECU (multiplex network body ECU) sends an illumination request signal to the headlight ECU sub-assembly LH and illuminates the daytime running lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. PERFORM ACTIVE TEST USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch to on (IG).

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

   4. 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

   REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

   B

2. REPLACE HEADLIGHT UNIT ASSEMBLY LH

   
   

   1. Replace the headlight unit assembly LH with a new or known good one.

      Click here

   2. Check that the clearance light LH and daytime running light LH operate normally.

      OK
      Clearance light LH and daytime running light LH operate normally.

      Result
      Proceed to OK NG

   
   

   OK

   END (HEADLIGHT UNIT ASSEMBLY LH WAS DEFECTIVE)

   NG

   REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

3. REPLACE HEADLIGHT UNIT ASSEMBLY RH

   
   

   1. Replace the headlight unit assembly RH with a new or known good one.

      Click here

   2. Check that the clearance light RH and daytime running light RH operate normally.

      OK
      Clearance light RH and daytime running light RH operate normally.

      Result
      Proceed to OK NG

   
   

   OK

   END (HEADLIGHT UNIT ASSEMBLY RH WAS DEFECTIVE)

   NG

   REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here