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Check Door Lock Switch And Circuit

WARNING: This page is about a different car, the 2005 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
CHECKING DOOR LOCK SWITCH AND CIRCUIT

Step Check Yes No
1 : CHECK DOOR LOCK SWITCH CIRCUIT. 
  1. Disconnect the body integrated unit harness connector.
  2. Measure the resistance between the harness connector terminal and chassis ground when moving the door lock switch to LOCK.

Connector & terminal 
(B281) No. 12 - Chassis ground: 
Is the resistance less than 10 ohm? Go to step 2.  Go to step 3. 
2 : CHECK DOOR LOCK SWITCH CIRCUIT. 
Measure the resistance between the harness connector terminal and chassis ground when moving the door lock switch to UNLOCK.
Connector & terminal 
(B281) No. 11 - Chassis ground: 
Is the resistance less than 10 ohm? The door lock switch is OK. Go to step 3. 
3 : CHECK DOOR LOCK SWITCH. 
  1. Disconnect the door lock switch harness connector.
  2. Measure the resistance between the door lock switch terminals when moving the door lock switch to LOCK.

Connector & terminal 
Driver's side: 
(D7) No. 5 - No. 9: 
Passenger's side: 
(D62) No. 4 - No. 5  :
Is the resistance less than 1 ohm? Go to step 4.  Replace the door lock switch.
4 : CHECK DOOR LOCK SWITCH. 
Measure the resistance between the door lock switch terminals when moving the door lock switch to UNLOCK.
Connector & terminal 
Driver's side: 
(D7) No. 5 - No. 8: 
Passenger's side: 
(D62) No. 2 - No. 5: 
Is the resistance less than 1 ohm? Check the harness for open circuits or shorts between the body integrated unit and the door lock switch. Replace the door lock switch.