LIGHTING SYSTEM Clearance Light/Daytime Running Light Circuit

DESCRIPTION

Clearance light function:

• The clearance light function illuminates the clearance light/daytime running light* LEDs when the main body ECU (multiplex network body ECU) inputs the light control switch position signals to the headlight ECU sub-assembly.




• *: w/ Cornering Light

Daytime running light function (w/ Cornering Light):

• The daytime running light function illuminates the clearance light/daytime running light LEDs in the clearance light assembly at the daytime running light brightness level (brighter than the clearance light level) when the main body ECU (multiplex network body ECU) inputs the light control switch position signals, engine speed signals and surrounding brightness signals to the headlight ECU aub-assembly, and the operation conditions of the daytime running light function are met.

WIRING DIAGRAM

1. w/ Cornering Light:

   

2. for ALPHARD (w/o Cornering Light)

   

   *a	Clearance Light
   *b	Headlight Clearance LED Socket
   *c	Headlight Unit Assembly
   *d	Headlight ECU Sub-assembly

3. for VELLFIRE (w/o Cornering Light)

   

   *a	Clearance Light
   *b	Headlight Clearance LED Unit
   *c	Headlight Unit Assembly
   *d	Headlight ECU Sub-assembly

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK VEHICLE TYPE

   
   

   1. Check vehicle type.

      Result
      Result Proceed to w/ Cornering Light A w/o Cornering Light B

   
   

   B

   PERFORM ACTIVE TEST USING GTS Click here

   A

2. PERFORM ACTIVE TEST USING GTS

   
   

   1. Using the GTS, perform the Active Test.

      Click here

      
      Body Electrical > HL AutoLeveling > Active Test

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

      Result
      Result Proceed to The Active Test is performed normally A The Active Test is not performed normally for the left side light only B The Active Test is not performed normally for the right side light only C

   
   

   A

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

   C

   CHECK HEADLIGHT UNIT ASSEMBLY RH Click here

   B

3. CHECK HEADLIGHT UNIT ASSEMBLY LH

   
   

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

      for ALPHARD:

      Click here

      for VELLFIRE:

      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

   
   

   NG

   REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

   OK

4. CHECK HEADLIGHT UNIT ASSEMBLY LH

   
   

   1. Remove the headlight unit assembly LH.

      for ALPHARD:

      Click here

      for VELLFIRE:

      Click here

      

      *A	for ALPHARD	*B	for VELLFIRE
      *a	Component without harness connected (to Headlight ECU Sub-assembly LH)	*b	Component without harness connected (to Printed Circuit Board)
      *c	Component without harness connected (to Headlight Clearance LED Unit)	-	-

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

      Standard Resistance
      for ALPHARD Tester Connection Condition Specified Condition B-10 - H-8 Always Below 1 Ω B-18 - H-7 Always Below 1 Ω B-1 - H-6 Always Below 1 Ω H-1 - I-5 Always Below 1 Ω H-2 - I-1 Always Below 1 Ω
      for VELLFIRE Tester Connection Condition Specified Condition B-10 - H-7 Always Below 1 Ω B-18 - H-6 Always Below 1 Ω B-1 - H-5 Always Below 1 Ω H-1 - I-6 Always Below 1 Ω H-2 - I-1 Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE HEADLIGHT UNIT ASSEMBLY LH for ALPHARD: REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here REPLACE HEADLIGHT UNIT ASSEMBLY LH for VELLFIRE: REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

   OK

5. CHECK HEADLIGHT CLEARANCE LED UNIT LH

   
   

   1. Replace the headlight clearance LED unit LH with new one.

      for ALPHARD:

      Click here

      for VELLFIRE:

      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 CLEARANCE LED UNIT LH WAS DEFECTIVE)

   NG

   REPLACE HEADLIGHT UNIT ASSEMBLY LH for ALPHARD: REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here REPLACE HEADLIGHT UNIT ASSEMBLY LH for VELLFIRE: REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

6. CHECK HEADLIGHT UNIT ASSEMBLY RH

   
   

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

      for ALPHARD:

      Click here

      for VELLFIRE:

      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

   
   

   NG

   REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

   OK

7. CHECK HEADLIGHT UNIT ASSEMBLY RH

   
   

   1. Remove the headlight unit assembly RH.

      for ALPHARD:

      Click here

      for VELLFIRE:

      Click here

      

      *A	for ALPHARD	*B	for VELLFIRE
      *a	Component without harness connected (to Headlight ECU Sub-assembly RH)	*b	Component without harness connected (to Printed Circuit Board)
      *c	Component without harness connected (to Headlight Clearance LED Unit)	-	-

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

      Standard Resistance
      for ALPHARD Tester Connection Condition Specified Condition B-10 - H-8 Always Below 1 Ω B-18 - H-7 Always Below 1 Ω B-1 - H-6 Always Below 1 Ω H-1 - I-5 Always Below 1 Ω H-2 - I-1 Always Below 1 Ω
      for VELLFIRE Tester Connection Condition Specified Condition B-10 - H-7 Always Below 1 Ω B-18 - H-6 Always Below 1 Ω B-1 - H-5 Always Below 1 Ω H-1 - I-6 Always Below 1 Ω H-2 - I-1 Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE HEADLIGHT UNIT ASSEMBLY RH for ALPHARD: REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here REPLACE HEADLIGHT UNIT ASSEMBLY RH for VELLFIRE: REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

   OK

8. CHECK HEADLIGHT CLEARANCE LED UNIT RH

   
   

   1. Replace the headlight clearance LED unit RH with new one.

      for ALPHARD:

      Click here

      for VELLFIRE:

      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 CLEARANCE LED UNIT RH WAS DEFECTIVE)

   NG

   REPLACE HEADLIGHT UNIT ASSEMBLY RH for ALPHARD: REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here REPLACE HEADLIGHT UNIT ASSEMBLY RH for VELLFIRE: REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

9. PERFORM ACTIVE TEST USING GTS

   
   

   1. Using the GTS, perform the Active Test.

      Click here

      
      Body Electrical > HL AutoLeveling > Active Test

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Clearance Light	Illuminates cornering lights	ON or OFF	-

      
      Body Electrical > HL AutoLeveling > Active Test

      Tester Display
      Clearance Light

      Result
      Result Proceed to The Active Test is performed normally A The Active Test is not performed normally for the left side light only B The Active Test is not performed normally for the right side light only C

   
   

   A

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

   C

   CHECK HEADLIGHT UNIT ASSEMBLY RH Click here

   B

10. CHECK HEADLIGHT UNIT ASSEMBLY LH

    
    

    1. Remove the headlight unit assembly LH.

       for ALPHARD:

       Click here

       for VELLFIRE:

       Click here

       

       *A	for ALPHARD	*B	for VELLFIRE
       *a	Component without harness connected (Headlight ECU Sub-assembly LH)	*b	Component without harness connected (Headlight Clearance LED Socket)
       *c	Component without harness connected (Headlight Clearance LED Unit)	-	-

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

       Standard Resistance
       for ALPHARD Tester Connection Condition Specified Condition B-19 - K-3 Always Below 1 Ω B-2 - K-1 Always Below 1 Ω
       for VELLFIRE Tester Connection Condition Specified Condition B-19 - K-2 Always Below 1 Ω B-2 - K-1 Always Below 1 Ω

       Result
       Result Proceed to OK (for ALPHARD) A OK (for VELLFIRE) B NG C

    
    

    B

    CHECK HEADLIGHT CLEARANCE LED UNIT LH Click here

    C

    REPLACE HEADLIGHT UNIT ASSEMBLY LH for ALPHARD: REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here REPLACE HEADLIGHT UNIT ASSEMBLY LH for VELLFIRE: REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

    A

11. CHECK HEADLIGHT CLEARANCE LED SOCKET

    
    

    1. Replace the headlight clearance LED socket with new one.

       Click here

    2. Check that the clearance light LH operate normally.

       OK
       Clearance LH operate normally.

       Result
       Proceed to OK NG

    
    

    OK

    END (HEADLIGHT CLEARANCE LED SOCKET WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

12. CHECK HEADLIGHT CLEARANCE LED UNIT LH

    
    

    1. Replace the headlight clearance LED unit LH with new one.

       Click here

    2. Check that the clearance light LH operate normally.

       OK
       Clearance LH operate normally.

       Result
       Proceed to OK NG

    
    

    OK

    END (HEADLIGHT CLEARANCE LED UNIT LH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

13. CHECK HEADLIGHT UNIT ASSEMBLY RH

    
    

    1. Remove the headlight unit assembly RH.

       for ALPHARD:

       Click here

       for VELLFIRE:

       Click here

       

       *A	for ALPHARD	*B	for VELLFIRE
       *a	Component without harness connected (Headlight ECU Sub-assembly RH)	*b	Component without harness connected (Headlight Clearance LED Socket)
       *c	Component without harness connected (Headlight Clearance LED Unit)	-	-

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

       Standard Resistance
       for ALPHARD Tester Connection Condition Specified Condition B-19 - K-3 Always Below 1 Ω B-2 - K-1 Always Below 1 Ω
       for VELLFIRE Tester Connection Condition Specified Condition B-19 - K-2 Always Below 1 Ω B-2 - K-1 Always Below 1 Ω

       Result
       Result Proceed to OK (for ALPHARD) A OK (for VELLFIRE) B NG C

    
    

    B

    CHECK HEADLIGHT CLEARANCE LED UNIT RH Click here

    C

    REPLACE HEADLIGHT UNIT ASSEMBLY RH for ALPHARD: REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here REPLACE HEADLIGHT UNIT ASSEMBLY RH for VELLFIRE: REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

    A

14. CHECK HEADLIGHT CLEARANCE LED SOCKET

    
    

    1. Replace the headlight clearance LED socket with new one.

       Click here

    2. Check that the clearance light RH operate normally.

       OK
       Clearance RH operate normally.

       Result
       Proceed to OK NG

    
    

    OK

    END (HEADLIGHT CLEARANCE LED SOCKET WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

15. CHECK HEADLIGHT CLEARANCE LED UNIT RH

    
    

    1. Replace the headlight clearance LED unit RH with new one.

       Click here

    2. Check that the clearance light RH operate normally.

       OK
       Clearance RH operate normally.

       Result
       Proceed to OK NG

    
    

    OK

    END (HEADLIGHT CLEARANCE LED UNIT RH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here