BACK DOOR CLOSER SYSTEM Back Door cannot be Opened

DESCRIPTION

When the back door cannot be opened, one of the following may be malfunctioning: 1) back door motor unit (power back door ECU)*1 or multiplex network door ECU (back door closer ECU)*2, 2) back door lock assembly, 3) back door opener switch assembly, or 4) main body ECU.


WIRING DIAGRAM

A01CE29E06

INSPECTION PROCEDURE

Note

The back door closer system uses CAN communication. First, follow "How to Proceed with Troubleshooting" and at step "Check Communication Function of CAN Communication System", confirm that there is no malfunction in the CAN communication system. After confirming that B2250 or B2251 is not output, proceed with troubleshooting.

PROCEDURE


  1. READ VALUE 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 / Main Body / Data List.

    5. Check if the switch is functioning properly.

      Main Body (Main Body ECU)
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Back Door Open Back door lock / Permit or Prohibit

      Permit: Back door unlocked

      Prohibit: Back door locked

      		 -
      OK
      The back door functions as specified in the "Normal Condition" column.

    NG

    REPLACE MAIN BODY ECU Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER


    1. Turn the engine switch on (IG).

    2. Enter the following menus: Body / Back Door / Data List.

    3. Check if the switch is functioning properly.

      Back Door (Power Back Door ECU*1 or Back Door Closer ECU*2)
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Door Lock Status Back door lock condition signal / LOCK or UNLOCK

      LOCK: Back door locked

      UNLOCK: Back door unlocked

      		 -

      • *1: w/ Power Back Door System

      • *2: w/o Power Back Door System

      OK
      The back door functions as specified in the "Normal Condition" column.
      Result
      Result Proceed to
      OK A
      NG (w/ Power Back Door System) B
      NG (w/o Power Back Door System) C

    B

    REPLACE BACK DOOR MOTOR UNIT (POWER BACK DOOR ECU) Click here

    C

    REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR CLOSER ECU) Click here

    A

  3. READ VALUE USING INTELLIGENT TESTER


    1. Turn the engine switch on (IG).

    2. Enter the following menus: Body / Main Body / Data List.

    3. Check if the switch is functioning properly.

      Main Body (Main Body ECU)
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Back Door Open Handle SW Back door opener switch / ON or OFF

      ON: Back door opener switch pushed

      OFF: Back door opener switch not pushed

      		 -
      OK
      The back door opener switch functions as specified in the "Normal Condition" column.

    NG

    INSPECT BACK DOOR OPENER SWITCH ASSEMBLY Click here

    OK

  4. INSPECT BACK DOOR LOCK ASSEMBLY


    1. Remove the back door lock assembly Click here.

    2. Apply battery voltage and check the operation of the door lock motor.

      A01CEPPE01
      OK
      Measurement Condition Specified Condition

      Battery positive (+) → Terminal 1 (M+)

      Battery negative (-) → Terminal 2 (M-)

      		 Latch turns to full-latch position

      Battery positive (+) → Terminal 2 (M-)

      Battery negative (-) → Terminal 1 (M+)

      		 Latch turns to open-latch position

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

      Standard Resistance
      Latch Switch
      Tester Connection Condition Specified Condition
      5 (CLS) - 4 (E) Open-latch Below 1 Ω
      5 (CLS) - 4 (E) Half-latch 10 kΩ or higher
      5 (CLS) - 4 (E) Full-latch 10 kΩ or higher
      5 (CLS) - 4 (E) Over-latch Below 1 Ω
      Sector Switch
      Tester Connection Condition Specified Condition
      6 (OPN) - 4 (E) Sector gear in neutral position (Sector switch on) Below 1 Ω
      6 (OPN) - 4 (E) Sector gear not in neutral position (Sector switch off) 10 kΩ or higher
      Back Door Courtesy Switch
      Tester Connection Condition Specified Condition
      3 (CTY) - 4 (E) Open-latch Below 1 Ω
      3 (CTY) - 4 (E) Half-latch Below 1 Ω
      3 (CTY) - 4 (E) Full-latch 10 kΩ or higher
      3 (CTY) - 4 (E) Over-latch 10 kΩ or higher

    NG

    REPLACE BACK DOOR LOCK ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - POWER BACK DOOR ECU OR BACK DOOR CLOSER ECU)


    1. Disconnect the N18*1 or L21*2 connector.


      • *1: w/ Power Back Door System

      • *2: w/o Power Back Door System

    2. w/ Power Back Door System


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

        A01CFYQE15
        Standard Resistance
        Tester Connection Condition Specified Condition
        U13-1 (M+) - N18-2 (DC+) Always Below 1 Ω
        U13-2 (M-) - N18-1 (DC-) Always Below 1 Ω
        U13-5 (CLS) - N18-22 (HAF) Always Below 1 Ω
        U13-6 (OPN) - N18-24 (POS) Always Below 1 Ω
        U13-3 (CTY) - N18-20 (FUL) Always Below 1 Ω
        U13-4 (E) - Body ground Always Below 1 Ω
        U13-1 (M+) - Body ground Always 10 kΩ or higher
        U13-2 (M-) - Body ground Always 10 kΩ or higher
        U13-5 (CLS) - Body ground Always 10 kΩ or higher
        U13-6 (OPN) - Body ground Always 10 kΩ or higher
        U13-3 (CTY) - Body ground Always 10 kΩ or higher

    3. w/o Power Back Door System


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

        A01CDVUE12
        Standard Resistance
        Tester Connection Condition Specified Condition
        U13-1 (M+) - N33-2 (DC+) Always Below 1 Ω
        U13-2 (M-) - N33-1 (DC-) Always Below 1 Ω
        U13-5 (CLS) - N33-5 (HAF) Always Below 1 Ω
        U13-6 (OPN) - N33-7 (POS) Always Below 1 Ω
        U13-3 (CTY) - N33-6 (FUL) Always Below 1 Ω
        U13-4 (E) - Body ground Always Below 1 Ω
        U13-1 (M+) - Body ground Always 10 kΩ or higher
        U13-2 (M-) - Body ground Always 10 kΩ or higher
        U13-5 (CLS) - Body ground Always 10 kΩ or higher
        U13-6 (OPN) - Body ground Always 10 kΩ or higher
        U13-3 (CTY) - Body ground Always 10 kΩ or higher
        Result
        Result Proceed to
        NG A
        OK (w/ Power Back Door System) B
        OK (w/o Power Back Door System) C

    B

    REPLACE BACK DOOR MOTOR UNIT (POWER BACK DOOR ECU) Click here

    C

    REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR CLOSER ECU) Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. INSPECT BACK DOOR OPENER SWITCH ASSEMBLY


    1. Remove the back door opener switch assembly Click here.

    2. A01CCG2E01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (E) - 3 (UL) Back door opener switch not pushed (off) 10 kΩ or higher
      2 (E) - 3 (UL) Back door opener switch pushed (on) Below 1 Ω

    NG

    REPLACE BACK DOOR OPENER SWITCH ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - MAIN BODY ECU)


    1. Disconnect the G48 main body ECU connector.

    2. A01CF5DE02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U7-3 (UL) - G48-26 (BDSU) Always Below 1 Ω
      U7-2 (E) - Body ground Always Below 1 Ω
      U7-3 (UL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU Click here