LIGHTING SYSTEM(for LED Headlight) 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 No. 1 headlight ECU sub-assembly 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 No. 1 headlight ECU sub-assembly and illuminates the daytime running lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. PERFORM ACTIVE TEST USING GTS

   
   

   1. Using the GTS, perform the Active Test.

      Click here

      AFS

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Clearance Light	Clearance lights	OFF or ON	-
      Daytime Running Light	Daytime running lights	OFF or ON	-

      OK
      Clearance lights and daytime running lights illuminate.

      Result
      Result Proceed to OK A NG (LH side clearance lights and daytime running lights does not illuminate.) B NG (RH side clearance lights and daytime running lights does not illuminate.) C

   
   

   A

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

   C

   CHECK HEADLIGHT UNIT RH Click here

   B

2. CHECK HEADLIGHT UNIT LH

   
   

   1. Interchange the headlight unit LH with RH and connect the connectors to them.

      Click here

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

      Click here

      AFS

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Clearance Light	Clearance lights	OFF or ON	-
      Daytime Running Light	Daytime running lights	OFF or ON	-

      OK
      Clearance light LH and daytime running light LH illuminate.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH Click here

   OK

3. CHECK HEADLIGHT UNIT LH

   
   
   1. 

      *a	Front view of wire harness connector (to No. 1 Headlight ECU Sub-assembly LH)
      *b	Front view of wire harness connector (to Headlight Unit Assembly LH)

      Remove the headlight unit assembly LH.

      Click here

   2. Remove the headlight unit LH.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition B-20 (DRL+) - D-2 Always Below 1 Ω B-16 (PWM1) - D-1 Always Below 1 Ω B-11 (DRL-) - D-3 Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

   NG

   REPLACE HEADLIGHT UNIT LH Click here

4. CHECK HEADLIGHT UNIT RH

   
   

   1. Interchange the headlight unit RH with LH and connect the connectors to them.

      Click here

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

      Click here

      AFS

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Clearance Light	Clearance lights	OFF or ON	-
      Daytime Running Light	Daytime running lights	OFF or ON	-

      OK
      Clearance light RH and daytime running light RH illuminate.

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH Click here

   OK

5. CHECK HEADLIGHT UNIT RH

   
   
   1. 

      *a	Front view of wire harness connector (to No. 1 Headlight ECU Sub-assembly RH)
      *b	Front view of wire harness connector (to Headlight Unit Assembly RH)

      Remove the headlight unit assembly RH.

      Click here

   2. Remove the headlight unit RH.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition B-20 (DRL+) - D-2 Always Below 1 Ω B-16 (PWM1) - D-1 Always Below 1 Ω B-11 (DRL-) - D-3 Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

   NG

   REPLACE HEADLIGHT UNIT RH Click here