Check Door Lock Actuator And Circuit

Wiring diagram:

Door lock control system Ref. to WIRING SYSTEM>DOOR LOCK CONTROL SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

NOTE: For models with power rear gate, refer to "Power Rear Gate System" in the wiring diagram. Ref. to WIRING SYSTEM>POWER REAR GATE SYSTEM>WIRING DIAGRAM .

CHECK HARNESS (DOOR LOCK) .
1. Disconnect the body integrated unit and each door lock actuator connector.
2. Check the harness between body integrated unit and each door lock actuator.
  Connector & terminal
  
  Front door LH
  
  (i5) No. 6 - (Df54) No. 4:
  
  Front door RH
  
  (i5) No. 7 - (Df53) No. 4:
  
  Rear door LH
  
  (i4) No. 5 - (Dr44) No. 4:
  
  Rear door RH
  
  (i4) No. 4 - (Dr43) No. 4:
Is harness normal?

Yes: Go to 2.

No: Repair or replace the harness.
CHECK HARNESS (DOOR UNLOCK) .
Check the harness between body integrated unit and each door lock actuator.

Connector & terminal

Front door LH

(i81) No. 6 - (Df54) No. 1:

Front door RH

(i4) No. 3 - (Df53) No. 1:

Rear door LH

(i4) No. 9 - (Dr44) No. 1:

Rear door RH

(i4) No. 3 - (Dr43) No. 1:

Is harness normal?

Yes: Go to 3.

No: Repair or replace the harness.
CHECK HARNESS (TRUNK LID UNLOCK OR REAR GATE UNLOCK) .
Check the harness between body integrated unit and trunk lid lock actuator or rear gate lock actuator.

Connector & terminal

Trunk lid

(i4) No. 7 - (Td47) No. 1:

Rear gate

(i4) No. 7 - (Db61) No. 4:

Is harness normal?

Yes: Go to 4.

No: Repair or replace the harness.
CHECK HARNESS (TRUNK LID UNLOCK OR REAR GATE UNLOCK) .
Measure the resistance between connector of trunk lid lock actuator or rear gate lock actuator and chassis ground.

Connector & terminal

Trunk lid

(Td47) No. 2 - Chassis ground:

Rear gate

(Db61) No. 3 - Chassis ground:

Is the resistance less than 10 Ω?

Yes: Go to 5.

No: Repair or replace the harness.
CHECK BODY INTEGRATED UNIT OUTPUT SIGNAL .
1. Connect the body integrated unit connector.
2. Measure the voltage between terminals of the body integrated unit when operating the door lock switch to LOCK direction.
  Connector & terminal
  
  Front door LH
  
  (i5) No. 6 (+) - (i81) No. 6 (-):
  
  Front door RH
  
  (i5) No. 7 (+) - (i4) No. 3 (-):
  
  Rear door LH
  
  (i4) No. 5 (+) - (i4) No. 9 (-):
  
  Rear door RH
  
  (i4) No. 4 (+) - (i4) No. 3 (-):
Does the voltage change from less than 1 V → 9 V or more? (During lock output)

Yes: Go to 6.

No: Replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .
CHECK BODY INTEGRATED UNIT OUTPUT SIGNAL .
Measure the voltage between terminals of the body integrated unit when operating the door lock switch to UNLOCK direction.

Connector & terminal

Front door LH

(i81) No. 6 (+) - (i5) No. 6 (-):

Front door RH

(i4) No. 3 (+) - (i5) No. 7 (-):

Rear door LH

(i4) No. 9 (+) - (i4) No. 5 (-):

Rear door RH

(i4) No. 3 (+) - (i4) No. 4 (-):

Does the voltage change from less than 1 V → 9 V or more? (During unlock output)

Yes: Go to 7.

No: Replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .
CHECK BODY INTEGRATED UNIT OUTPUT SIGNAL .
Measure the voltage between body integrated unit and chassis ground when operating the trunk opener switch or the rear gate opener button.

Connector & terminal

(i4) No. 7 (+) - Chassis ground (-):

Does the voltage change from less than 1 V → 9 V or more? (During unlock output)

Yes: Go to 8.

No: Replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .
CHECK DOOR LOCK ACTUATOR .
Check the door lock actuator. Ref. to SECURITY AND LOCKS>DOOR LATCH & DOOR LOCK ACTUATOR ASSEMBLY>INSPECTION .

Is the door lock actuator OK?

Yes: Go to 9.

No: Replace the door latch and door lock actuator assembly.
CHECK TRUNK LID LOCK ACTUATOR OR REAR GATE LOCK ACTUATOR .
- Check the trunk lid lock actuator. Ref. to SECURITY AND LOCKS>TRUNK LID LATCH AND ACTUATOR ASSEMBLY>INSPECTION .
- Check the rear gate lock actuator. Ref. to SECURITY AND LOCKS>REAR GATE LATCH AND ACTUATOR ASSEMBLY>INSPECTION .
Is the trunk lid lock actuator or the rear gate lock actuator normal?

Yes: Check the connection status of the harness and connector that may have a temporary poor contact.

No:
- Replace the trunk lid latch & actuator assembly. Ref. to SECURITY AND LOCKS>TRUNK LID LATCH AND ACTUATOR ASSEMBLY .
- Replace the rear gate latch and actuator assembly. Ref. to SECURITY AND LOCKS>REAR GATE LATCH AND ACTUATOR ASSEMBLY .