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 light control ECU assembly.

  *: w/ Cornering Light

• Daytime running light function (w/ Cornering Light)




• The daytime running light function (w/ Cornering Light) 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 light control ECU assembly, and the operation conditions of the daytime running light function are met.

WIRING DIAGRAM

1. for ALPHARD (w/ Cornering Light)

   

2. for ALPHARD (w/o Cornering Light)

   

3. for VELLFIRE (w/ Cornering Light)

   Figure 1. for RH Side

   

   Figure 2. for LH Side

   

4. for VELLFIRE (w/o Cornering Light)

   

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK VEHICLE TYPE

   
   

   1. Check vehicle type.

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

   
   

   w/o Cornering Light

   PERFORM ACTIVE TEST USING GTS (CLEARANCE LIGHT) Click here

   w/ Cornering Light

2. PERFORM ACTIVE TEST USING GTS (DAYTIME RUNNING LIGHT)

   
   

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

   
   

   A

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

   C

   CHECK CLEARANCE/DAYTIME RUNNING LIGHT Click here

   B

3. CHECK CLEARANCE/DAYTIME RUNNING LIGHT

   
   

   1. 

      Remove the headlight sub-assembly RH.

      for ALPHARD:

      Click here

      for VELLFIRE:

      Click here

   2. Remove the headlight light control ECU sub-assembly RH (sub) from the headlight sub-assembly RH.

      Click here

   3. Check the light illumination condition when the battery voltage is applied to each connector terminal.

      Standard
      Battery Connection Specified Condition Battery positive (+) terminal - B-20 Battery negative (-) terminal - B-16 Battery negative (-) terminal - B-11 LED illuminates*

      Note

      
      

      • Do not apply battery voltage to the connector terminals for 30 seconds or more. Otherwise, the internal circuit may become damaged.

      • When checking more than once, wait 1 minute or more between each check

      Tech Tips

      *: Brighter than normal clearance light or daytime running light illumination

      Result
      Proceed to All LEDs Illuminate All LEDs do not Illuminate Some LEDs do not Illuminate (for ALPHARD) Some LEDs do not Illuminate (for VELLFIRE)

   
   

   All LEDs Illuminate

   REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH (SUB) Click here

   Some LEDs do not Illuminate (for ALPHARD)

   REPLACE CLEARANCE LIGHT LED UNIT ASSEMBLY RH Click here

   Some LEDs do not Illuminate (for VELLFIRE)

   CHECK HEADLIGHT SUB-ASSEMBLY RH Click here

   All LEDs do not Illuminate

4. CHECK HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS ASSEMBLY)

   
   

   1. 

      Remove the headlight sub-assembly RH.

      for ALPHARD:

      Click here

      for VELLFIRE:

      Click here

   2. Remove the headlight light control ECU sub-assembly RH (sub) from the headlight sub-assembly RH.

      Click here

   3. Remove the clearance light LED unit from the headlight sub-assembly RH.

      for ALPHARD:

      Click here

      for VELLFIRE:

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition B-20 - A-1 Always Below 1 Ω B-16 - A-2 Always Below 1 Ω B-11 - A-3 Always Below 1 Ω

      Result
      Proceed to OK (for ALPHARD) OK (for VELLFIRE) NG

   
   

   OK (for ALPHARD)

   REPLACE CLEARANCE LIGHT LED UNIT ASSEMBLY RH Click here

   OK (for VELLFIRE)

   REPLACE NO. 2 CLEARANCE LIGHT LED UNIT ASSEMBLY RH Click here

   NG

   REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS ASSEMBLY) for ALPHARD: REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS ASSEMBLY) Click here REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS ASSEMBLY) for VELLFIRE: REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS ASSEMBLY) Click here

5. CHECK HEADLIGHT SUB-ASSEMBLY RH

   
   

   1. Remove the headlight sub-assembly RH.

      Click here

      

   2. Remove the No. 2 clearance light LED unit assembly RH from the headlight sub-assembly RH.

      Click here

   3. Remove the clearance light LED unit assembly from the headlight sub-assembly RH.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition C-1 - F-1 Always Below 1 Ω C-2 - E-1 Always Below 1 Ω C-3 - F-2 Always Below 1 Ω C-4 - E-2 Always Below 1 Ω C-5 - G-1 Always Below 1 Ω C-6 - G-4 Always Below 1 Ω D-1 - I-1 Always Below 1 Ω D-3 - I-3 Always Below 1 Ω G-2 - H-1 Always Below 1 Ω G-3 - H-2 Always Below 1 Ω G-5 - H-3 Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE HEADLIGHT SUB-ASSEMBLY RH Click here

   OK

6. CHECK NO. 2 CLEARANCE LIGHT LED UNIT ASSEMBLY RH

   
   

   1. Remove the headlight sub-assembly RH.

      Click here

      

   2. Remove the headlight light control ECU sub-assembly RH (sub) from the headlight sub-assembly RH.

      Click here

   3. Remove the No. 2 clearance light LED unit assembly RH from the headlight sub-assembly RH.

      Click here

   4. Remove the clearance light LED unit assembly RH from the headlight sub-assembly RH.

      Click here

   5. Connect connectors A, C, D, E and F to the No. 2 clearance light LED unit assembly RH.

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

      Standard Voltage
      Tester Connection Condition Specified Condition I-1 - I-3 Battery voltage applied between B-20 (battery positive [+]) and B-11 and B-16 (battery negative [-]) terminals 11 to 14 V G-1 - G-4 11 to 14 V

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE CLEARANCE LIGHT LED UNIT ASSEMBLY Click here

   NG

   REPLACE NO. 2 CLEARANCE LIGHT LED UNIT ASSEMBLY RH Click here

7. CHECK CLEARANCE/DAYTIME RUNNING LIGHT

   
   

   1. 

      Remove the headlight sub-assembly LH.

      for ALPHARD:

      Click here

      for VELLFIRE:

      Click here

   2. Remove the headlight light control ECU sub-assembly LH (main) from the headlight sub-assembly LH.

      Click here

   3. Check the light illumination condition when the battery voltage is applied to each connector terminal.

      Standard
      Battery Connection Specified Condition Battery positive (+) terminal - B-20 Battery negative (-) terminal - B-16 Battery negative (-) terminal - B-11 LED illuminates*

      Note

      
      

      • Do not apply battery voltage to the connector terminals for 30 seconds or more. Otherwise, the internal circuit may become damaged.

      • When checking more than once, wait 1 minute or more between each check.

      Tech Tips

      *: Brighter than normal clearance light or daytime running light illumination.

      Result
      Proceed to All LEDs Illuminate All LEDs do not Illuminate Some LEDs do not Illuminate (for ALPHARD) Some LEDs do not Illuminate (for VELLFIRE)

   
   

   All LEDs Illuminate

   REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH (MAIN) Click here

   Some LEDs do not Illuminate (for ALPHARD)

   REPLACE CLEARANCE LIGHT LED UNIT ASSEMBLY LH Click here

   Some LEDs do not Illuminate (for VELLFIRE)

   CHECK HEADLIGHT SUB-ASSEMBLY LH Click here

   All LEDs do not Illuminate

8. CHECK HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS ASSEMBLY)

   
   

   1. 

      Remove the headlight sub-assembly LH.

      for ALPHARD:

      Click here

      for VELLFIRE:

      Click here

   2. Remove the headlight light control ECU sub-assembly LH (main) from the headlight sub-assembly LH.

      Click here

   3. Remove the clearance light LED unit from the headlight sub-assembly LH.

      for ALPHARD:

      Click here

      for VELLFIRE:

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition B-20 - A-1 Always Below 1 Ω B-16 - A-2 Always Below 1 Ω B-11 - A-3 Always Below 1 Ω

      Result
      Proceed to OK (for ALPHARD) OK (for VELLFIRE) NG

   
   

   OK (for ALPHARD)

   REPLACE CLEARANCE LIGHT LED UNIT ASSEMBLY LH Click here

   OK (for VELLFIRE)

   REPLACE NO. 2 CLEARANCE LIGHT LED UNIT ASSEMBLY LH Click here

   NG

   REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS ASSEMBLY) for ALPHARD: REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS ASSEMBLY) Click here REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS ASSEMBLY) for VELLFIRE: REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS ASSEMBLY) Click here

9. CHECK HEADLIGHT SUB-ASSEMBLY LH

   
   

   1. Remove the headlight sub-assembly LH.

      Click here

      

   2. Remove the No. 2 clearance light LED unit assembly LH from the headlight sub-assembly LH.

      Click here

   3. Remove the clearance light LED unit assembly LH from the headlight sub-assembly LH.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition C-1 - F-1 Always Below 1 Ω C-2 - E-1 Always Below 1 Ω C-3 - F-2 Always Below 1 Ω C-4 - E-2 Always Below 1 Ω C-5 - G-1 Always Below 1 Ω C-6 - G-4 Always Below 1 Ω D-1 - I-1 Always Below 1 Ω D-3 - I-3 Always Below 1 Ω G-2 - H-1 Always Below 1 Ω G-3 - H-2 Always Below 1 Ω G-5 - H-3 Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE HEADLIGHT SUB-ASSEMBLY LH Click here

   OK

10. CHECK NO. 2 CLEARANCE LIGHT LED UNIT ASSEMBLY LH

    
    

    1. Remove the headlight sub-assembly LH.

       Click here

       

    2. Remove the headlight light control ECU sub-assembly LH (main) from the headlight sub-assembly LH.

       Click here

    3. Remove the No. 2 clearance light LED unit assembly LH from the headlight sub-assembly LH.

       Click here

    4. Remove the clearance light LED unit assembly LH from the headlight sub-assembly LH.

       Click here

    5. Connect connectors A, C, D, E and F to the No. 2 clearance light LED unit assembly LH.

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

       Standard Voltage
       Tester Connection Condition Specified Condition I-1 - I-3 Battery voltage applied between B-20 (battery positive [+]) and B-11 and B-16 (battery negative [-]) terminals 11 to 14 V G-1 - G-4 11 to 14 V

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE CLEARANCE LIGHT LED UNIT ASSEMBLY Click here

    NG

    REPLACE NO. 2 CLEARANCE LIGHT LED UNIT ASSEMBLY LH Click here

11. PERFORM ACTIVE TEST USING GTS (CLEARANCE LIGHT)

    
    

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

    
    

    A

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

    C

    CHECK CLEARANCE LIGHT Click here

    B

12. CHECK CLEARANCE LIGHT

    
    

    1. 

       Remove the headlight sub-assembly RH.

       for ALPHARD:

       Click here

       for VELLFIRE:

       Click here

    2. Remove the headlight light control ECU sub-assembly RH (sub) from the headlight sub-assembly RH.

       Click here

    3. Check the light illumination condition when the battery voltage is applied to each connector terminal.

       Standard
       Battery Connection Specified Condition Battery positive (+) terminal - B-20 Battery negative (-) terminal - B-11 LED illuminates

       Note

       
       

       • Do not apply battery voltage to the connector terminals for 30 seconds or more. Otherwise, the internal circuit may become damaged.

       • When checking more than once, wait 1 minute or more between each check.

       Result
       Proceed to OK NG (for ALPHARD) NG (for VELLFIRE)

    
    

    OK

    REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH (SUB) Click here

    NG (for VELLFIRE)

    CHECK HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS ASSEMBLY) Click here

    NG (for ALPHARD)

13. CHECK HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS ASSEMBLY)

    
    

    1. 

       Remove the headlight sub-assembly RH.

       Click here

    2. Remove the headlight light control ECU sub-assembly RH (sub) from the headlight sub-assembly RH.

       Click here

    3. Disconnect the clearance light LED unit RH connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition B-20 - A-1 Always Below 1 Ω B-11 - A-3 Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE CLEARANCE LIGHT LED UNIT ASSEMBLY RH Click here

    NG

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS ASSEMBLY) Click here

14. CHECK HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS ASSEMBLY)

    
    

    1. 

       Remove the headlight sub-assembly RH.

       Click here

    2. Remove the headlight light control ECU sub-assembly RH (sub) from the headlight sub-assembly RH.

       Click here

    3. Remove the clearance light LED unit assembly RH from the headlight sub-assembly RH.

       Click here

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

       Standard Resistance
       Tester Connection Condition Specified Condition B-20 - A-1 Always Below 1 Ω B-11 - A-2 Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE CLEARANCE LIGHT LED UNIT ASSEMBLY RH Click here

    NG

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS ASSEMBLY) Click here

15. CHECK CLEARANCE LIGHT

    
    

    1. 

       Remove the headlight sub-assembly LH.

       for ALPHARD:

       Click here

       for VELLFIRE:

       Click here

    2. Remove the headlight light control ECU sub-assembly LH (main) from the headlight sub-assembly LH.

       Click here

    3. Check the light illumination condition when the battery voltage is applied to each connector terminal.

       Standard
       Battery Connection Specified Condition Battery positive (+) terminal - B-20 Battery negative (-) terminal - B-11 LED illuminates

       Note

       
       

       • Do not apply battery voltage to the connector terminals for 30 seconds or more. Otherwise, the internal circuit may become damaged.

       • When checking more than once, wait 1 minute or more between each check.

       Result
       Proceed to OK NG (for ALPHARD) NG (for VELLFIRE)

    
    

    OK

    REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH (MAIN) Click here

    NG (for VELLFIRE)

    CHECK HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS ASSEMBLY) Click here

    NG (for ALPHARD)

16. CHECK HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS ASSEMBLY)

    
    

    1. 

       Remove the headlight sub-assembly LH.

       Click here

    2. Remove the headlight light control ECU sub-assembly LH (main) from the headlight sub-assembly LH.

       Click here

    3. Disconnect the clearance light LED unit LH connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition B-20 - A-1 Always Below 1 Ω B-11 - A-3 Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE CLEARANCE LIGHT LED UNIT ASSEMBLY LH Click here

    NG

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS ASSEMBLY) Click here

17. CHECK HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS ASSEMBLY)

    
    

    1. 

       Remove the headlight sub-assembly RH.

       Click here

    2. Remove the headlight light control ECU sub-assembly LH (main) from the headlight sub-assembly RH.

       Click here

    3. Remove the clearance light LED unit assembly RH from the headlight sub-assembly RH.

       Click here

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

       Standard Resistance
       Tester Connection Condition Specified Condition B-20 - A-1 Always Below 1 Ω B-11 - A-2 Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE CLEARANCE LIGHT LED UNIT ASSEMBLY LH Click here

    NG

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS ASSEMBLY) Click here