LIGHTING 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

A003V1VE01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Data List.

    5. Read the display on the intelligent tester.

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


    1. A003YK3E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Headlight Leveling ECU Assembly)

      Disconnect the A46 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
      A46-1 (IG) - Body ground Power switch on (IG) 11 to 14 V
      A46-1 (IG) - Body ground Power switch off Below 1 V

    NG
    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
      A46-9 (E1) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B
    C
    A