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
*a | Daytime Running Light/Clearance Light |
*b | Headlight Unit Assembly |
*c | Headlight ECU Sub-assembly |
CAUTION / NOTICE / HINT
Note
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.
PROCEDURE
PERFORM ACTIVE TEST USING GTS
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Enter the following menus: Body Electrical / HL AutoLeveling / Active Test.
Perform the Active Test according to the display on the GTS.
Tester Display | Measurement Item | Control Range | Diagnostic Note |
---|---|---|---|
Clearance Light | Clearance lights | ON or OFF | - |
Daytime Running Light | Daytime running lights | ON or OFF | - |
Tester Display |
---|
Clearance Light |
Tester Display |
---|
Daytime Running Light |
OK |
---|
Clearance lights and daytime running lights illuminate. |
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
A |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here |
C |
REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here |
B |
REPLACE HEADLIGHT UNIT ASSEMBLY LH
Replace the headlight unit assembly LH with a new or known good one.
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 | |||
---|---|---|---|
|
OK |
END (HEADLIGHT UNIT ASSEMBLY LH WAS DEFECTIVE) |
NG |
REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here |
REPLACE HEADLIGHT UNIT ASSEMBLY RH
Replace the headlight unit assembly RH with a new or known good one.
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 | |||
---|---|---|---|
|
OK |
END (HEADLIGHT UNIT ASSEMBLY RH WAS DEFECTIVE) |
NG |
REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here |