LIGHTING SYSTEM Interior Light Auto Cut Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls operation of the DOME CUT relay in order to supply power to the interior lights. When the battery saving function operates while the interior lights are on, the main body ECU (multiplex network body ECU) opens the DOME CUT relay to turn off the lights.

WIRING DIAGRAM

B006X97E01

CAUTION / NOTICE / HINT

Note


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

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*1

  • The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before performing this troubleshooting procedure, make sure to perform an on-vehicle inspection to confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*2

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    • *1: w/ Smart Entry and Start System

    • *2: w/ Door Control Battery

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Relay for Interior Light Auto Cut Function DOME CUT relay OFF or ON

      When performing this Active Test, turn all the interior lights on.


      • OFF: DOME CUT relay on (interior lights turn on)

      • ON: DOME CUT relay off (interior lights turn off)

      Body Electrical > Main Body > Active Test
      Tester Display
      Relay for Interior Light Auto Cut Function
      OK
      All of the interior lights turn off when ON is selected.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3F*1 or 3G*2 instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3F-1 - Body ground*1 Always 11 to 14 V
      3G-1 - Body ground*2 Always 11 to 14 V

      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    B006XEFC10
    *A for LHD *B for RHD
    *a

    Component without harness connected

    (Instrument Panel Junction Block Assembly)

    		 - -

    1. Remove the instrument panel junction block assembly.

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    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      3D-19 - Battery negative (-)

      Battery positive (+) → 3F-1

      Battery negative (-) → MB-23 (DOMR)

      		 11 to 14 V
      3B-10 - Battery negative (-)

      Battery positive (+) → 3F-1

      Battery negative (-) → MB-23 (DOMR)

      		 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      3D-19 - Battery negative (-)

      Battery positive (+) → 3G-1

      Battery negative (-) → MB-23 (DOMR)

      		 11 to 14 V
      3B-10 - Battery negative (-)

      Battery positive (+) → 3G-1

      Battery negative (-) → MB-23 (DOMR)

      		 11 to 14 V

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      3F-1 - 3D-19 Always 10 kΩ or higher
      3F-1 - 3B-10 Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      3G-1 - 3D-19 Always 10 kΩ or higher
      3G-1 - 3B-10 Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here