Headlight Leveling ECU Power Source Circuit

LIGHTING: LIGHTING SYSTEM: Headlight Leveling ECU Power Source Circuit

Headlight Leveling ECU Power Source Circuit

DESCRIPTION

This circuit provides power to operate the headlight beam level control ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (ECU - BATTERY)




(a) Disconnect the H12 ECU connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






OK -- PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.

2. CHECK WIRE HARNESS (ECU - BODY GROUND)




(a) Disconnect the H12 ECU connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR (GROUND CIRCUIT)
OK -- REPAIR OR REPLACE HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)