POWER BACK DOOR SYSTEM Back Door Lock Motor Circuit

DESCRIPTION

The back door lock motor is built into the back door lock. The power back door unit (power back door ECU) controls the back door lock motor to open/close the back door. This ECU applies current to terminals 2 and 1 to operate the motor to close the door. It reverses the direction of the current to operate the motor to open the door.

WIRING DIAGRAM

A01ES4LE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT BACK DOOR LOCK ASSEMBLY


    1. A01ERWEE03

      Remove the back door lock Click here.

    2. Set the back door lock to the half-latch position.

    3. 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 over-latch position

    4. Set the back door lock to the full-latch position.

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

      OK
      Measurement Condition Specified Condition

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

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

      		 Latch turns to open-latch position

    NG

    REPLACE BACK DOOR LOCK ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (LOCK - UNIT)


    1. A01EQR6E05

      Disconnect the S19 door lock connector.

    2. Disconnect the L36 unit connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S19-1 (M+) - L36-2 (DC+) Always Below 1 Ω
      S19-2 (M-) - L36-1 (DC-) Always Below 1 Ω
      S19-1 (M+) - Body ground Always 10 kΩ or higher
      S19-2 (M-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER BACK DOOR UNIT ASSEMBLY Click here