LIGHTING SYSTEM Headlight Beam Level Control Actuator Circuit

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (HEADLIGHT LEVELING MOTOR)

   
   

   1. Using the intelligent tester, perform the Active Test Click here.

      HL Auto Leveling

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

      
      

      • *: Perform the Active Test with the engine running and vehicle stopped.

      OK
      Headlight leveling motors operate normally.

   
   

   OK

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

   NG

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

   
   

   1. Disconnect the E109 headlight leveling ECU connector.

   2. Disconnect the A54*1 or A58*2 headlight leveling motor connector.

      
      

      • *1: for LH

      • *2: for RH

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

      Standard Resistance
      for LH Tester Connection Condition Specified Condition E109-11 (LH+) - A54-8 (LHIG) Always Below 1 Ω E109-18 (LHT) - A54-3 (LH T) Always Below 1 Ω E109-24 (LH-) - A54-4 (LH E) Always Below 1 Ω E109-11 (LH+) - Body ground Always 10 kΩ or higher E109-18 (LHT) - Body ground Always 10 kΩ or higher E109-24 (LH-) - Body ground Always 10 kΩ or higher
      for RH Tester Connection Condition Specified Condition E109-10 (RH+) - A58-8 (RHIG) Always Below 1 Ω E109-17 (RHT) - A58-3 (RH T) Always Below 1 Ω E109-23 (RH-) - A58-4 (RH E) Always Below 1 Ω E109-10 (RH+) - Body ground Always 10 kΩ or higher E109-17 (RHT) - Body ground Always 10 kΩ or higher E109-23 (RH-) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. INSPECT HEADLIGHT UNIT ASSEMBLY

   
   

   1. Remove the headlight unit Click here.

      

      Text in Illustration

      *a	Component without harness connected (Headlight Unit Assembly LH)	*b	Component without harness connected (Headlight Unit Assembly RH)
      *c	Front view of wire harness connector (to Headlight Leveling Motor LH)	*d	Front view of wire harness connector (to Headlight Leveling Motor RH)

   2. Disconnect the headlight leveling motor connector.

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

      Standard Resistance
      for LH
      Tester Connection Condition Specified Condition 8 (LHIG) - 3 Always Below 1 Ω 3 (LH T) - 2 4 (LH E) - 1
      for RH
      Tester Connection Condition Specified Condition 8 (RHIG) - 3 Always Below 1 Ω 3 (RH T) - 2 4 (RH E) - 1

   
   

   NG

   REPLACE HEADLIGHT UNIT ASSEMBLY Click here

   OK

4. CHECK HEADLIGHT LEVELING MOTOR

   
   

   1. Temporarily replace the headlight leveling motor with a new or normally functioning one Click here.

   2. Perform the Active Test of the leveling motors Click here.

      OK
      Headlight leveling motors operate normally.
      Result Result Proceed to OK A NG (for LHD) B NG (for RHD) C

   
   

   A

   END (HEADLIGHT LEVELING MOTOR WAS DEFECTIVE)

   B

   REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

   C

   REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here