LIGHTING 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.

WIRING DIAGRAM

A002NNYE01
*a from IG1 Relay
*b ECU-IG NO. 1
*c Headlight Leveling ECU Assembly

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


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

      HL Auto Leveling (Headlight Leveling ECU)
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      +B Ignition power supply voltage value / 0 to 19.75 V 11 to 14 V -
      OK
      The display is as specified in the normal condition column.

    OK

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

    NG

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

    A002PE6E03
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Headlight Leveling ECU Assembly)

    1. Disconnect the A49 headlight leveling ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A49-1 (IG) - Body ground Ignition switch ON 11 to 14 V
      A49-1 (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)

    A002OSKE02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Headlight Leveling ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A49-9 (E1) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    C

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here