R&B

My dads C4 door key will not work on either door. The key turns to lock, will not turn to unlock. The car is parked in the garage with doors locked and windows up. Can't open doors to check fuses or relays. He tried both sets of keys, same problem. Any thoughts?

RIC96

If the keys won't unlock either door, fuses are not the problem. Sounds like it's time for a slim jim.

R&B

Car has been sitting for nearly 3 months with doors locked. Odd both doors won't unlock and odd that both door keys will not work. Is the door lock part of the alarm system? Is there something else I should look at that may be causing the problem. And yes, looks like I will buy a slim jim.

Cruisinfanatic

has nothing to do with any alarm. Either the key fits or it doesnt

Cliff Harris

It is in 1989 and earlier. It honks the horn if the door is opened while the TDS (Theft Deterrent System) is armed.

Ratboy

The door lock motors and/or linkages can get seized up. I assume the key turns to the lock position but not back to unlock? Mine was always real difficult to turn the drivers side. Once inside, I'd have to hit the unlock button several times for it to fully unlock, but only once to lock it.