AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM(for Sedan) 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

A01TB7FE31
*a from IG1 NO. 1 Relay
*b ECU-IG NO. 3
*c Headlight Leveling ECU Assembly

CAUTION / NOTICE / HINT

Note


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

  • Make sure to perform vehicle information synchronization and initialization after replacing the headlight leveling ECU assembly.

    Click here

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Read the Data List according to the display on the GTS.


      Body Electrical > HL AutoLeveling > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      +B IG power supply voltage value 0.00 to 19.75 V 11.00 to 14.00 V -

      Body Electrical > HL AutoLeveling > Data List
      Tester Display
      +B
      OK
      Normal condition listed above is displayed.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

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


    1. Disconnect the A182 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
      A182-1 (IG) - Body ground Ignition switch off Below 1 V
      A182-1 (IG) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    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
      A182-9 (E1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR