today my 1999 automatic locks stopped working . when I put the car in drive the locks do not automaticly lock anymore. I tried the sequence in the owners manual and the locks do there thing but still no go. any ideas? everything is working except the auto lock feature when put into drive. Thanks

 

try to check central lock motor.

 

There are a lot of variables on your vehicle. Thr transmission range sensor can cause it if the PCM thinks the vehicle is not in gear. A door switch that is not operating properly may make the PCM think the door is not shut. Wiring can be a problem. The Lighting Control Module also can be at fault. A high end scan tool can read the parameters and isolate where the problem is. Good luck and keep us informed.