LIGHTING SYSTEM Headlight Signal Circuit

DESCRIPTION

The headlight leveling ECU assembly detect the low beam headlights status.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK VEHICLE CONDITION (LOW BEAM HEADLIGHT)

   
   

   1. Check the illuminating condition of the low beam headlights.

      OK
      Low beam headlights illuminates.

   
   

   NG

   GO TO PROBLEM SYMPTOMS TABLE Click here

   OK

2. READ VALUE USING INTELLIGENT TESTER (HEADLIGHT LOW BEAM STATE)

   
   

   1. Using the intelligent tester, read the Data List Click here.

      HL Auto Leveling

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Headlight Low Beam State	Low beam headlight state / ON or OFF	ON: Low beam headlights on OFF: Low beam headlights off	-

      OK
      Normal condition listed above is displayed.

      Result
      Result Proceed to NG A OK B

   
   

   B

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

   A

3. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY (H-LP/US-DRL) - HEADLIGHT LEVELING ECU)

   
   

   1. Remove the headlight relay from the No. 2 engine room relay block.

   2. Disconnect the A43 headlight leveling ECU assembly connector.

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

      

      Text in Illustration

      *a

      No. 2 Engine Room Relay Block (H-LP/US-DRL Relay Terminal)

      *b

      Front view of wire harness connector (to Headlight Leveling ECU Assembly)

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition Relay terminal 2 - A43-3 (HDLP) Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition A43-3 (HDLP) - Body ground Always 10 kΩ or higher

   
   

   OK

   REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR