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

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DTC Code DTC Name
  Headlight Leveling ECU Power Source Circuit
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DESCRIPTION

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

Table 1. *a from IG1 NO.1 Relay *b IG1 NO.4 *c Headlight Leveling ECU Assembly
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • If the headlight leveling ECU assembly has been replaced, it is necessary to initialize the headlight leveling ECU assembly.

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

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PROCEDURE


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    READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Read the display on the GTS.


      1. 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 -



      1. Body Electrical > HL AutoLeveling > Data List
        Tester Display
        +B




      OK
      Normal condition listed above is displayed.
      Result
      Proceed to
      OK
      NG

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


    1. Disconnect the G80 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
      G80-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the G80 headlight leveling ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G80-9 (E1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE HEADLIGHT LEVELING ECU ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR