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Headlight Beam Level Control Actuator Circuit





LIGHTING (EXT): AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM: Headlight Beam Level Control Actuator Circuit
- Headlight Beam Level Control Actuator Circuit

DESCRIPTION

The headlight leveling ECU assembly actuates the headlight leveling motors according to vehicle conditions.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / HL Auto Leveling / Active Test.

(e) Check that the leveling motors operate.

HL Auto Leveling





OK:

Headlight leveling motors operate normally.

NG -- CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY)

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Automatic Headlight

2. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY)

(a) Disconnect the A34 headlight leveling ECU assembly connector.

(b) Disconnect the LH side or RH side headlight leveling motor connector.

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

Standard Resistance:

LH Side





RH Side





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK HEADLIGHT ASSEMBLY

(a) Replace the headlight assembly with a new or a known good one Removal.

(b) Perform the active test of the leveling motors.

OK:

Headlight leveling motors operate normally.

NG -- REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Removal

OK -- END (HEADLIGHT LEVELING MOTOR WAS DEFECTIVE)