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) power back door drive unit (power back door ECU), or 2) back door lock, or 3) back door open switch, or 4) main body ECU (instrument panel junction block).

WIRING DIAGRAM

A017EIME04

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE ON INTELLIGENT TESTER


    1. Check the Data List to determine if the back door lock function properly.

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

      LOCK: Back door is locked

      UNLOCK: Back door is unlocked

      		 -
      OK
      The back door functions as specified in the normal condition.

    NG

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

    OK

  2. READ VALUE ON INTELLIGENT TESTER


    1. Check the Data List to determine if the back door handle switch function properly.

      Main body ECU (Instrument panel junction block)
      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 is pushed

      OFF: Back door opener switch is not pushed

      		 -
      OK
      The back door opener switch functions as specified in the normal condition.

    NG

    INSPECT BACK DOOR OPENER SWITCH Click here

    OK

  3. INSPECT BACK DOOR LOCK

    A017F60E07

    1. Remove the back door lock Click here.

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

      OK
      Measurement Condition Specified Condition

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

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

      		 Latch turns to full-latch position

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

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

      		 Latch turns to open-latch position

    3. Measure the resistance of the switch.

      Standard resistance
      Full-latch switch
      Tester Connection Door Lock Latch Position Specified Condition
      5 (HAF) - 4 (GND) Over-latch Below 1 Ω
      5 (HAF) - 4 (GND) Open-latch 10 kΩ or higher
      5 (HAF) - 4 (GND) Full-latch 10 kΩ or higher
      5 (HAF) - 4 (GND) Half-latch 10 kΩ or higher
      Sector switch
      Tester Connection Door Lock Latch Position Specified Condition
      6 (POS) - 4 (GND) Open-latch Below 1 Ω
      6 (POS) - 4 (GND) Over-latch 10 kΩ or higher
      6 (POS) - 4 (GND) Full-latch 10 kΩ or higher
      6 (POS) - 4 (GND) Half-latch 10 kΩ or higher
      Back door courtesy light switch
      Tester Connection Door Lock Latch Position Specified Condition
      3 (BDCY) - 4 (GND) Open-latch Below 1 Ω
      3 (BDCY) - 4 (GND) Half-latch Below 1 Ω
      3 (BDCY) - 4 (GND) Full-latch 10 kΩ or higher
      3 (BDCY) - 4 (GND) Over-latch 10 kΩ or higher

    NG

    REPLACE BACK DOOR LOCK Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - POWER BACK DOOR ECU)


    1. A017F0NE08

      Disconnect the T4 back door lock connector.

    2. Disconnect the O14 ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      T4-1 (DC+) - O14-2 (DC+) Always Below 1 Ω
      T4-2 (DC-) - O14-1 (DC-) Always Below 1 Ω
      T4-5 (HAF) - O14-22 (HAF) Always Below 1 Ω
      T4-6 (POS) - O14-24 (POS) Always Below 1 Ω
      T4-3 (BDCY) - O14-20 (FUL) Always Below 1 Ω
      T4-4 (GND) - Body ground Always Below 1 Ω
      T4-1 (DC+) - Body ground Always 10 kΩ or higher
      T4-2 (DC-) - Body ground Always 10 kΩ or higher
      T4-5 (HAF) - Body ground Always 10 kΩ or higher
      T4-6 (POS) - Body ground Always 10 kΩ or higher
      T4-3 (BDCY) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  5. INSPECT BACK DOOR OPENER SWITCH


    1. Remove the back door opener switch Click here.

      A017BTUE05

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

      Standard resistance
      Tester Connection Switch Position Specified Condition
      2 - 3 Back door opener switch not pushed (OFF) 10 kΩ or higher
      2 - 3 Back door opener switch pushed (ON) Below 1 Ω

    NG

    REPLACE BACK DOOR OPENER SWITCH Click here

    OK

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


    1. A017CLCE01

      Disconnect the h1 switch connection.

    2. Disconnect the D8 ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      h1-3 (BDSU) - D8-26 (BDSU) Always Below 1 Ω
      h1-2 (L) - Body ground Always Below 1 Ω
      h1-3 (BDSU) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

  7. REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU)


    1. Replace the power back door drive unit (power back door ECU) Click here.


    NEXT

  8. CHECK POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU)


    1. Check that the back door closer operates normally.

      OK
      It operates normally.

    NG

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

    OK

    END (REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU) DEFECTIVE)