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

DESCRIPTION

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

WIRING DIAGRAM

A01I3TXE02

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. READ VALUE USING TECHSTREAM


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    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 (AUXILIARY 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 (AUXILIARY 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 Switch Condition Specified Condition
      A34-1 (IG) - Body ground Power switch on (IG) 11 to 14 V
      A34-1 (IG) - Body ground Power 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