LIGHTING SYSTEM Interior Light Auto Cut Circuit

DESCRIPTION

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

WIRING DIAGRAM

B000JY0E05
B000NDVE01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK SYMPTOMS


    1. Check symptoms.

      Result
      Result Proceed to
      All the interior lights that receive power via the light cut relay do not illuminate. A
      Battery saving function does not operate. B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER Click here

    A

  2. INSPECT LIGHT CUT RELAY


    1. Remove the light cut relay from the c1 light cut relay connector.

    2. B000H91E03
      Text in Illustration
      *a

      Component without harness connected

      (Light Cut Relay)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE LIGHT CUT RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (DOME FUSE - LIGHT CUT RELAY)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      c1-1 - Body ground Ignition switch off 11 to 14 V
      c1-3 - Body ground Ignition switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (LIGHT CUT RELAY)


    1. Install the light cut relay to the c1 light cut relay connector.

    2. B000IB3E02
      Text in Illustration
      *a

      Component with harness connected

      (Light Cut Relay)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      c1-5 - Body ground Ignition switch ON 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (LIGHT CUT RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (LIGHT CUT RELAY - EACH LIGHT)

  5. CHECK HARNESS AND CONNECTOR (LIGHT CUT RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Remove the light cut relay from the c1 light cut relay connector.

    2. Disconnect the 3A instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c1-2 - 3A-23 Always Below 1 Ω
      c1-2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly Click here.

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

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

      B000HDYE02
      Text in Illustration
      *a

      Component without harness connected

      (Instrument panel junction block assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-23 - MB-22 (DOMR) Always Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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

  7. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

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

    5. Check that the relay operates.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Relay for Interior Light Auto Cut Function Light cut relay ON/OFF -
      OK
      Light auto cut relay operates.

    NG

    INSPECT LIGHT CUT RELAY Click here

    OK

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

  8. INSPECT LIGHT CUT RELAY


    1. Remove the light cut relay from the c1 light cut relay connector.

    2. B000H91E03
      Text in Illustration
      *a

      Component without harness connected

      (Light Cut Relay)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE LIGHT CUT RELAY

    OK

  9. CHECK HARNESS AND CONNECTOR (LIGHT CUT RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3A instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c1-2 - 3A-23 Always Below 1 Ω
      c1-2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly Click here.

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

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

      B000HDYE02
      Text in Illustration
      *a

      Component without harness connected

      (Instrument panel junction block assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-23 - MB-22 (DOMR) Always Below 1 Ω
      3A-23 - Body ground Always 10 kΩ or higher

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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