Pinpoint Test A: A Single Door Lock Is Inoperative

WARNING: This page is about a different car, the 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK THE MANUAL OPERATION OF THE SUSPECT DOOR LOCK
- Manually operate the inoperative door lock.
- Check for binding or a stuck condition.
- Is the lock stuck or binding?
Yes : REPAIR the binding components. TEST the system for normal operation.

No : GO to
A2 CHECK THE LOCK ACTUATOR FOR THE LOCK OPERATION
- Key in OFF position.
- Disconnect: Passenger Door Lock Actuator C603.
- Disconnect: Driver Door Lock Actuator C525.
- Disconnect: Right Rear Door Lock Actuator C804.
- Disconnect: Left Rear Door Lock Actuator C704.
- Measure the voltage between the inoperative door lock actuator C603 (passenger), C525 (driver), C804 (RR), or C704 (LR) circuit 117 (PK/BK), harness side and ground while operating the door lock control switch to the lock position.
  
  Fig 1: Checking Lock Actuator For Lock Operation
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to A3.

No : REPAIR the circuit. TEST the system for normal operation.
A3 CHECK THE DOOR LOCK ACTUATOR FOR UNLOCK OPERATION
- Measure the voltage between the inoperative door lock actuator C603 (passenger), C525 (driver), C804 (RR), or C704 (LR), circuit 118 (PK/OG), harness side and ground while operating the door lock control switch to the unlock position.
  
  Fig 2: Checking Door Lock Actuator For Unlock Operation
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : INSTALL a new door lock actuator. REFER to DOOR LOCK ACTUATOR . TEST the system for normal operation.

No : REPAIR the circuit. TEST the system for normal operation.