LIGHTING SYSTEM Door Mirror Foot Light Circuit

DESCRIPTION

The turning on and off of the door mirror foot lights is controlled by the main body LH based on various signals received through BEAN communication.

The main body ECU LH includes a MOS-FET (Metal Oxide Semiconductor - Field Effect Transistor) circuit that fades the door mirror foot lights in and out by duty control.

This MOS-FET circuit has an overheat protection function as a fail-safe. If the main body ECU LH becomes excessively hot, the door mirror foot lights turn off and remain off.

Normal operation will resume when the conditions required to turn on the door mirror foot lights are met again.

WIRING DIAGRAM

A0161U4E01

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Body No. 3 / Active Test.

    5. Check the operation.

      Body No. 3 (Main body ECU LH)
      Tester Display Test Part Control Range Diagnostic Note
      Exterior Foot Light Operation Door mirror foot lights ON/OFF -
      OK
      Door mirror foot lights come on.

      Tech Tips

      The door mirror foot lights RH and LH share the same power source. If either of the lights does not come on, there may be a problem in the part of the circuit that relates to that light. Therefore, inspect that part of the circuit.


    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BATTERY) Click here

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BATTERY)


    1. A0161QQE10

      Disconnect the Q1 main body ECU LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q1-4 (LCTY) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)