Below are instructions I found for a 1992 Buick Park Av, give them a try:
Jump the (ALDL) Assembly Line Diagnostic Link. You will find this connector
under the driver side dash, but you will have to look through a square cut
out in the panel to see the connector, it is recessed behind that panel,
almost directly under the steering column. It should look like this;
[F] [E] [D] [C] [B] [A]
[G] [H] [J] [K] [L] [M]
Jumper pin A to pin G with a fused jumper (3A)
Doors will lock and unlock
Press the UNLOCK button on the remote
Doors should lock and unlock again
if you have more remotes press their unlock button (up to 4)
remove jumper wire
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