Check Door Switch

Wiring diagram:

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

Courtesy of SUBARU OF AMERICA, INC.

CHECK DATA MONITOR .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, display the following items in the [Data monitor] of [Body Control]. Ref. to COMMON (DIAGNOSTICS)>DATA MONITOR .
- [Driver's door SW input]
- [P-door SW input]
- [R Gate SW input]
Does the display switch between [OFF] ←→ [ON] when each door or trunk lid is opened/closed?

Yes: The door switch or the trunk lid latch switch is normal.

No: Go to 2.
CHECK HARNESS .
1. Turn the ignition switch to OFF.
2. Disconnect the connector of the door switch or the trunk lid latch switch that does not show any change on the display.
3. Check the harness between body integrated unit and defective switch.
  Connector & terminal
  
  Front door RH
  
  (Df53) No. 6 (+) - Chassis ground (-):
  
  Front door LH
  
  (Df54) No. 9 (+) - Chassis ground (-):
  
  Trunk lid
  
  (Td47) No. 3 (+) - Chassis ground (-):
Is the voltage 6 V or more?

Yes: Go to 3.

No: Repair or replace the defective part.
CHECK HARNESS .
Measure the resistance between the faulty switch connector and chassis ground.

Connector & terminal

Front door RH

(Df53) No. 8 - Chassis ground:

Front door LH

(Df54) No. 7 - Chassis ground:

Trunk lid

(Td47) No. 2 - Chassis ground:

Is the resistance less than 10 Ω?

Yes: Go to 4.

No: Repair or replace the defective part.
CHECK DOOR SWITCH .
Measure the resistance between faulty switch terminals.

Terminals

Front RH door switch

No. 6 - No. 8:

Front LH door switch

No. 9 - No. 7:

Trunk lid latch switch

No. 3 - No. 2:

Is the resistance 1 MΩ or more when each door or the trunk lid is closed?

Yes: Go to 5.

No: Replace the following faulty parts.
- Door latch & door lock actuator assembly: Ref. to SECURITY AND LOCKS>DOOR LATCH & DOOR LOCK ACTUATOR ASSEMBLY .
- Trunk lid latch & actuator assembly: Ref. to SECURITY AND LOCKS>TRUNK LID LATCH AND ACTUATOR ASSEMBLY .
CHECK F/B .
1. Remove the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT>REMOVAL .
2. Measure the resistance between the F/B terminals.
  Connector & terminal
  
  F/B No. 16 - (i281) No. 28:
  
  F/B No. 10 - (i282) No. 13:
  
  F/B No. 12 - (i283) No. 20:
Is harness normal?

Yes: Check the connector.

If there is no abnormality, replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .

No: Replace the F/B.