AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM Headlight Beam Level Control Actuator Circuit

DESCRIPTION

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

WIRING DIAGRAM

PROCEDURE

1. PERFORM ACTIVE TEST USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Start the engine.

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / HL AutoLeveling / Active Test.

   5. Perform the Active Test of the leveling motors.

      
      Body Electrical > HL AutoLeveling > Active Test

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Drive The Leveling Motor	Leveling motor upward or downward operation	Stop/Down/Up	Perform the Active Test with the engine started and vehicle stopped

      
      Body Electrical > HL AutoLeveling > Active Test

      Tester Display
      Drive The Leveling Motor

      OK
      Headlight leveling motors operate normally.

      Result
      Proceed to OK NG

   
   

   OK

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

   NG

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

   
   

   1. Disconnect the A67 headlight leveling ECU assembly connector.

   2. Disconnect the A22*1 or A30*2 headlight leveling motor connector.

      
      

      • *1: for LH Side

      • *2: for RH Side

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

      Standard Resistance
      for LH Side Tester Connection Condition Specified Condition A67-11 (LH+) - A22-3 (LHIG) Always Below 1 Ω A67-18 (LHT) - A22-2 (LH T) Always Below 1 Ω A67-24 (LH-) - A22-1 (LH E) Always Below 1 Ω A67-11 (LH+) - Body ground Always 10 kΩ or higher A67-18 (LHT) - Body ground Always 10 kΩ or higher A67-24 (LH-) - Body ground Always 10 kΩ or higher
      for RH Side Tester Connection Condition Specified Condition A67-10 (RH+) - A30-3 (RHIG) Always Below 1 Ω A67-17 (RHT) - A30-2 (RH T) Always Below 1 Ω A67-23 (RH-) - A30-1 (RH E) Always Below 1 Ω A67-10 (RH+) - Body ground Always 10 kΩ or higher A67-17 (RHT) - Body ground Always 10 kΩ or higher A67-23 (RH-) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK HEADLIGHT LEVELING MOTOR

   
   

   1. Replace the headlight leveling motor with a new or known good one.

      Click here

   2. Perform the Active Test of the leveling motors.

      
      Body Electrical > HL AutoLeveling > Active Test

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Drive The Leveling Motor	Leveling motor upward or downward operation	Stop/Down/Up	Perform the Active Test with the engine started and vehicle stopped

      
      Body Electrical > HL AutoLeveling > Active Test

      Tester Display
      Drive The Leveling Motor

      OK
      Headlight leveling motors operate normally.

      Result
      Proceed to OK NG

   
   

   OK

   END (HEADLIGHT LEVELING MOTOR WAS DEFECTIVE)

   NG

   REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here