LIGHTING SYSTEM Interior Light Circuit

DESCRIPTION

The interior lights turn on when a door is opened, and turn off when the door is closed. This illumination setting can be canceled using the overhead junction block switch.

In addition, the interior lights blink while the theft deterrent system is sounding an alarm.

The interior lights is controlled by the main body ECU 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 interior 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 interior lights turn off and remain off.

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

If the vehicle is equipped with scuff plate lights, their operation timing is the same as that of the interior lights.

WIRING DIAGRAM

A0162OXE04

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK SEAT ILLUMINATION (OPERATION)

    Tech Tips

    The personal lights and interior lights share the same power source. Therefore, if none of them come on, inspect the power source circuit first.


    1. Push the switches for the personal lights.

    2. Check that the personal lights come on.

      OK
      Personal lights come on.

    NG

    CHECK HARNESS AND CONNECTOR (POWER SOURCE) Click here

    OK

  2. 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
      Interior Light Operation Interior lights ON/OFF -
      OK
      The front and rear interior lights come on.
      Result
      Result Proceed to
      Front interior light does not come on A
      Rear interior light does not come on B
      Neither front nor rear interior light comes on C
      OK D

    A

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

    B

    INSPECT SPOT LIGHT ASSEMBLY (REAR INTERIOR LIGHT) Click here

    C

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD JUNCTION BLOCK) Click here

    D

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

  3. INSPECT SPOT LIGHT ASSEMBLY (REAR INTERIOR LIGHT)


    1. A01624HE05

      Remove the spot light assembly.

    2. Connect a positive (+) lead from the battery to terminal 2 and a negative (-) lead to terminal 4, and then check that the interior light comes on.

      OK
      The interior light comes on.

    NG

    REPLACE SPOT LIGHT ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (OVERHEAD JUNCTION BLOCK - SPOT LIGHT ASSEMBLY)


    1. A0162G1E01

      Disconnect the R8 spot light assembly connector.

    2. Disconnect the R5 overhead junction block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R8-2 (ILLB) - R5-4 (ILLB) Always Below 1 Ω
      R8-4 (RILL) - R5-33 (RILL) Always Below 1 Ω
      R8-2 (ILLB) - Body ground Always 10 kΩ or higher
      R8-4 (RILL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD JUNCTION BLOCK)


    1. A0161QQE09

      Disconnect the Q1 main body ECU LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q1-2 (ILE) - Body ground Always 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD JUNCTION BLOCK) Click here

    OK

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

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD JUNCTION BLOCK)


    1. A0162GPE02

      Disconnect the Q1 main body ECU LH connector.

    2. Disconnect the R5 overhead junction block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q1-2 (ILE) - R5-13 (ILL) Always Below 1 Ω
      Q1-2 (ILE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  7. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. A01631RE13

      Disconnect the R5 overhead junction block connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      R5-1 (+B1) - 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)