Pinpoint Test

1. Spray a lock lubricant such as Penetrating and Lock Lubricant (US); Penetrating Fluid (Canada) into the lock cylinder opening for a couple of seconds.
2. 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 Multi-Purpose Grease XL-5 into the lock cylinder for a couple seconds to provide long term lubrication.
• No: GO to 2  .

1. Remove the door lock cylinder. REFER to Door Lock Cylinder .
2. Operate the door lock cylinder with the key.

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

• Yes: GO to 3  .
• No: INSTALL a new door lock cylinder. REFER to Door Lock Cylinder .

1. Operate the door lock cylinder while observing the linkage.

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

• Yes: REPAIR as necessary.
• No: INSTALL a new door latch. REFER to Front Door Latch  or REFER to Rear Door Latch .