Headlight Beam Level Control Actuator Circuit

LIGHTING (EXT): LIGHTING SYSTEM: Headlight Beam Level Control Actuator Circuit
- Headlight Beam Level Control Actuator Circuit

DESCRIPTION

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

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (READY).

(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 Exterior Lighting System

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

(a) Disconnect the A46 headlight leveling ECU assembly connector.

(b) Disconnect the A8 or A39 headlight assembly 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 (HEADLIGHT ASSEMBLY - HEADLIGHT LEVELING MOTOR)

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

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

Standard Resistance:

LH Side





RH Side





NG -- REPLACE HEADLIGHT ASSEMBLY
OK -- Continue to next step.

4. REPLACE HEADLIGHT LEVELING MOTOR

(a) Replace the headlight leveling motor with a new or a known good one Disassembly.

(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)