POWER DOOR LOCK CONTROL SYSTEM Only Back Door cannot be Opened

DESCRIPTION

The main body ECU (multiplex network body ECU) receives signals from the back door opener switch assembly. Then, the main body ECU (multiplex network body ECU) activates the back door lock motor.

WIRING DIAGRAM

B002H3WE01

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the vehicle power switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

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

  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

  • The power door lock control system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power door lock control system after confirming that the communication systems are functioning properly.

    Click here

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (Trunk and Back-Door Open)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    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
      Trunk and Back-Door Open Back door lock motor OFF/ON -

      Body Electrical > Main Body > Active Test
      Tester Display
      Trunk and Back-Door Open
      OK
      The back door lock assembly unlatches when ON is selected.
      Result
      Result Proceed to
      OK (w/ Entry Function) A
      OK (w/o Entry Function) B
      NG C

    A

    GO TO ENTRY AND START SYSTEM (for Entry Function) Click here

    C

    INSPECT BACK DOOR LOCK ASSEMBLY Click here

    B

  2. INSPECT BACK DOOR OPENER SWITCH ASSEMBLY


    1. Remove the bakc door opener switch assembly.

      Click here

    2. Inspect the bakc door opener switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BACK DOOR OPENER SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] AND BODY GROUND)


    1. Disconnect the Y7 back door opener switch assembly connector.

    2. Disconnect the I48 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Y7-3 (UL) - I48-18 (BDSU) Always Below 1 Ω
      Y7- (E) - Body ground Always Below 1 Ω
      Y7-3 (UL) or I48-18 (BDSU) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. INSPECT BACK DOOR LOCK ASSEMBLY


    1. Remove the back door lock assembly.

      Click here

    2. Inspect the back door lock assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BACK DOOR LOCK ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)


    1. Disconnect the Y13 back door lock assembly connector.

    2. Disconnect the 4A 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
      Y13-2 (ACT+) - 4A-25 Always Below 1 Ω
      Y13-3 (D+) - 4A-21 Always Below 1 Ω
      Y13-1 (ACT-) - Body ground Always Below 1 Ω
      Y13-2 (ACT+) or 4A-25 - Body ground Always 10 kΩ or higher
      Y13-3 (D+) or 4A-21 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.


    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.

      B002I66C01
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A-4 (BCTY) - 4A-21 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here for RHD: Click here

    OK

  7. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (D/L BACK RELAY)


    1. Disconnect the instrument panel junction block assembly connector.

      B002I54C01
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4A-25 - 4D-9 Auxiliary battery voltage applied to terminals 4F-1 and A-6 10 kΩ or higher
      4A-25 - 4D-9 Auxiliary battery voltage not applied to terminals 4F-1 and A-6 Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      4A-25 - Auxiliary battery negative (-) terminal Auxiliary battery voltage applied to terminals 4F-1 and A-6 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here for RHD: Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here for RHD: Click here