Okay, here is the procedure I used for my '98 (hopefully this applies to '99)
1) Sit in driver's seat. Remove ignition key from lock cylinder. Close all vehicle doors. Remove MALL PGM fuse from fuse panel.
2) Insert ignition key, turn ignition to ACC position. Turn ignition to OFF, then back to ACC within one second. Open then close any vehicle door. Chime will be heard when remote control door lock receiver enters programming/diagnostic mode. If chime is not heard, buckle driver's seat belt. If chime is still not heard, open glove box. If chime is still not heard, repeat procedure from step 1.
3) Depress and hold transmitter LOCK and UNLOCK buttons simultaneously for 14 seconds. One chime should be heard at 7 to confirm successful synchronization and 14 seconds to confirm successful programming.
4) Repeat step 3) for each transmitter to be programmed. Remove ignition key. Install MALL PGM fuse.
Troubleshooting
Check R/CMPT REL fuse, fuse #32, and RADIO fuse. Verify proper operation of power door lock, trunk lid release and interior light systems. Ensure ground connections are clean and tight.
And if this doesn't work, hit it with a
heavily.
Good luck!