LIGHTING SYSTEM Front Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of the front door courtesy light switch assembly and illuminates the courtesy light assembly using this circuit.

WIRING DIAGRAM

B000H8QE03

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE 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 / Data List.

    5. Read the display on the intelligent tester.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Door Courtesy Front door courtesy light switch RH signal/ON or OFF

      ON: Front door RH closed

      OFF: Front door RH open

      		 -
      FL Door Courtesy Front door courtesy light switch LH signal/ON or OFF

      ON: Front door LH closed

      OFF: Front door LH open

      		 -
      OK
      Normal conditions listed above are displayed.
      Result
      Result Proceed to
      OK A
      Front door courtesy light switch LH or RH does not operate B

    B

    INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (LH OR RH) Click here

    A

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

  2. INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (LH OR RH)


    1. Remove the front door courtesy light switch assembly (for TMC, TMMR Made) Click here.

    2. Remove the front door courtesy light switch assembly (for TMMK Made) Click here.

    3. Inspect the front door courtesy light switch assembly (for TMMK Made) Click here.

    4. Inspect the front door courtesy light switch assembly (for TMC, TMMR Made) Click here.

      OK
      Front door courtesy light switch assembly is normal.
      Result
      Result Proceed to
      OK (for Front LH) A
      OK (for Front RH) B
      NG (for TMC, TMMR Made) C
      NG (for TMMK Made) D

    B

    CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    C

    REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY Click here

    D

    REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY Click here

    A

  3. CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


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

    2. Disconnect the N7 front door courtesy light switch assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N7-1 - 3C-15 Always Below 1 Ω
      N7-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. 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.

      B000M7IE08
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3C-15 - MB-2 (FLCY) Always Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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

  5. CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the I13 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the O10 front door courtesy light switch assembly RH connector.

    3. Disconnect the J2 courtesy light assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O10-1 - I13-19 (FRCY) Always Below 1 Ω
      O10-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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