AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM PROBLEM SYMPTOMS TABLE

Note

After the headlight ECU sub-assembly LH is replaced, vehicle information registration and initialization are necessary.

Tech Tips

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses related to this system before inspecting the suspected areas below.

Automatic Headlight Beam Level Control System
Symptom	Suspected Area	Link
Right side auto leveling does not operate (optical axis not controlled)	Headlight unit assembly RH (for ALPHARD)	Click here
	Headlight unit assembly RH (for VELLFIRE)	Click here
	Headlight ECU sub-assembly RH	Click here
Left side auto leveling does not operate (optical axis not controlled)	Headlight unit assembly LH (for ALPHARD)	Click here
	Headlight unit assembly LH (for VELLFIRE)	Click here
	Headlight ECU sub-assembly LH	Click here