LIGHTING SYSTEM > Headlight Beam Level Control Actuator Circuit

for Preparation Click here


DESCRIPTION

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

WIRING DIAGRAM


E223771E01


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (READY).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / HL Auto Leveling / Active Test.

  1. Check that the leveling motors operate.

    HL Auto Leveling 
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Drive The Leveling Motor UP
    		Leveling motor upward operation
    		ON/OFF
    		ON: Move up
    OFF: Stop
    Drive The Leveling Motor DOWN
    		Leveling motor downward operation
    		ON/OFF
    		ON: Move down
    OFF: Stop

    OK:
    Headlight leveling motors operate normally.



NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

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

  1. Disconnect the A46 headlight leveling ECU assembly connector.

  1. Disconnect the A8 or A39 headlight assembly connector.

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

    Standard Resistance:
    LH Side 
    Tester Connection
    		Condition
    		Specified Condition
    A8-8 (LHIG) - 3
    		Always
    		Below 1 Ω
    A8-3 (LHT) - 2
    		Always
    		Below 1 Ω
    A8-4 (LHE) - 1
    		Always
    		Below 1 Ω
    A8-8 (LHIG) - Body ground
    		Always
    		10 kΩ or higher
    A8-3 (LHT) - Body ground
    		Always
    		10 kΩ or higher
    A8-4 (LHE) - Body ground
    		Always
    		10 kΩ or higher
    RH Side 
    Tester Connection
    		Condition
    		Specified Condition
    A39-8 (RHIG) - 3
    		Always
    		Below 1 Ω
    A39-3 (RHT) - 2
    		Always
    		Below 1 Ω
    A39-4 (RHE) - 1
    		Always
    		Below 1 Ω
    A39-8 (RHIG) - Body ground
    		Always
    		10 kΩ or higher
    A39-3 (RHT) - Body ground
    		Always
    		10 kΩ or higher
    A39-4 (RHE) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HEADLIGHT ASSEMBLY (HEADLIGHT ASSEMBLY - HEADLIGHT LEVELING MOTOR)

  1. Disconnect the LH side or RH side headlight leveling motor connector.

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

    Standard Resistance:
    LH Side 
    Tester Connection
    		Condition
    		Specified Condition
    A46-18 (LHT) - A8-3 (LHT)
    		Always
    		Below 1 Ω
    A46-11 (LH+) - A8-8 (LHIG)
    		Always
    		Below 1 Ω
    A46-24 (LH-) - A8-4 (LHE)
    		Always
    		Below 1 Ω
    A46-18 (LHT) - Body ground
    		Always
    		10 kΩ or higher
    A46-11 (LH+) - Body ground
    		Always
    		10 kΩ or higher
    A46-24 (LH-) - Body ground
    		Always
    		10 kΩ or higher
    RH Side 
    Tester Connection
    		Condition
    		Specified Condition
    A46-17 (RHT) - A39-3 (RHT)
    		Always
    		Below 1 Ω
    A46-10 (RH+) - A39-8 (RHIG)
    		Always
    		Below 1 Ω
    A46-23 (RH-) - A39-4 (RHE)
    		Always
    		Below 1 Ω
    A46-17 (RHT) - Body ground
    		Always
    		10 kΩ or higher
    A46-10 (RH+) - Body ground
    		Always
    		10 kΩ or higher
    A46-23 (RH-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPLACE HEADLIGHT ASSEMBLY (Click here)
OK


4.REPLACE HEADLIGHT LEVELING MOTOR

  1. Replace the headlight leveling motor with a new or a known good one (Click here).

  1. Perform the active test of the leveling motors.

    OK:
    Headlight leveling motors operate normally.

    Result:
    Result
    		Proceed to
    NG
    		A
    OK (for LHD)
    		B
    OK (for RHD)
    		C



B
REPLACE HEADLIGHT LEVELING ECU ASSEMBLY (Click here)

C
REPLACE HEADLIGHT LEVELING ECU ASSEMBLY (Click here)
A

END (HEADLIGHT LEVELING MOTOR WAS DEFECTIVE)