AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM Headlight Leveling ECU Power Source Circuit

DESCRIPTION

This circuit detects the state of the ignition switch, and sends it to the headlight leveling ECU assembly.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

   
   

   1. Connect the Techstream to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the Techstream on.

   4. Enter the following menus: Body Electrical / HL Auto Leveling / Data List.

   5. Read the display on the Techstream.

      HL Auto Leveling

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      +B	IG power supply voltage value / 0 to 19.75 V	11 to 14 V	-

      OK
      Normal condition listed above is displayed.

   
   

   NG

   CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT LEVELING ECU ASSEMBLY) Click here

   OK

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

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

   
   

   1. Disconnect the A34 headlight leveling ECU assembly connector.

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition A34-1 (IG) - Body ground Ignition switch ON 11 to 14 V A34-1 (IG) - Body ground Ignition switch off Below 1 V

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - BODY GROUND)

   
   

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

      Standard Resistance
      Tester Connection Condition Specified Condition A34-9 (E1) - Body ground Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here