AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM Warning Light Circuit

DESCRIPTION

The headlight beam level control system warning light in the combination meter comes on for approximately 3 seconds when the ignition switch is turned to ON. The warning light also comes on when the headlight leveling ECU detects a malfunction.

WIRING DIAGRAM

A00YY05E01

CAUTION / NOTICE / HINT

Tech Tips

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

PROCEDURE


  1. INSPECT COMBINATION METER ASSEMBLY


    1. Remove the combination meter assembly.

      Click here

      A00YUR3N01

    2. Connect the positive (+) lead from the battery to terminal A-39 (IG+) and the negative (-) lead to terminal B-4 (LVWG).

    3. Check that the warning light comes on.

      Result
      Proceed to
      Warning light comes on
      Warning light does not comes on

    Warning light does not comes on

    REPLACE COMBINATION METER ASSEMBLY Click here

    Warning light comes on

  2. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY)


    1. A00YV6NC01
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the G16 combination meter connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G16-39 (IG+) - Body ground Ignition switch ON 10.5 to 14 V*1
      Ignition switch ON 11 to 14 V*2
      Ignition switch off Below 1 V
      *1: w/ Stop and Start System
      *2: w/o Stop and Start System
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY)


    1. Disconnect the G17 combination meter connector.

    2. Disconnect the A67 headlight leveling ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A67-6 (WNG) - G17-4 (LVWG) Always Below 1 Ω
      A67-6 (WNG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR