Pinpoint Test S: Manual Door Lock Cylinder Inoperative

Handles, Locks, Latches and Entry Systems

Pinpoint Test S: Manual Door Lock Cylinder Inoperative

Normal Operation

The door lock cylinder is connected to the door latch via a lock rod and can be used to manually lock/unlock a door.

This pinpoint test is intended to diagnose the following:

- Bent or binding lock rod and lever

- Door lock cylinder

- Door latch

PINPOINT TEST S : MANUAL DOOR LOCK CYLINDER INOPERATIVE

S1 CHECK THE LOCK CYLINDER OPERATION AFTER LUBRICATION

- Spray a lock lubricant such as Motorcraft XL-1 into the lock cylinder opening for a couple seconds.

- Operate the door lock cylinder with the key.

Does the door lock and unlock using the door lock cylinder?

Yes
The concern was caused by an insufficiently lubricated lock cylinder. Spray a multi-purpose grease such as Motorcraft XL-5 into the lock cylinder for a couple seconds to provide long term lubrication.

No
GO to S2.

S2 CHECK THE DOOR LOCK CYLINDER

- Remove the door lock cylinder. Refer to Door Lock Cylinder Service and Repair.

- Operate the door lock cylinder with the key.

Does the door lock cylinder rotate freely to both lock and unlock positions?

Yes
GO to S3.

No
INSTALL a new door lock cylinder. REFER to Door Lock Cylinder Service and Repair. TEST the system for normal operation.

S3 CHECK THE DOOR LOCK CYLINDER LINKAGE

- Operate the door lock cylinder while observing the linkage.

Is the door lock cylinder rod and lever bent or binding?

Yes
REPAIR as necessary. TEST the system for normal operation.

No
INSTALL a new door latch. REFER to Front Door Latch Front Door Latch or Door Latch - Side and Rear, Single Latch Door Latch - Side and Rear, Single Latch. TEST the system for normal operation.