http://www.programyourremote.com/classified/DisplayAd.asp?id=1356
This page makes it easy... just find the make, model and year and it will lead you to the exact instructions for your particular car. I programmed a new remote (which I bought off of ebay) for my husband's car just yesterday.
It was optional.
The 1989 Buick Park Avenue does not come with a remote keyless entry. The keyless remote entry was not available till 1997.
check in your owners manual if you have it.
The dealership scan tool is required.
iF YOU ARE TRYING TO PROGRAM A DEYLESS ENTRY, IT IS IN THE OWNERS MANUAL. iF YOU WANT ONE TRY motorlit.com
To program your keyless remote, locate the dark green program enable wire and connect to the wire enable terminal. Insert your ignition key and turn the switch to on while depressing either button on the transmitter. Disconnect the program enable wire terminal and remove the key from the ignition.
Mine didn't come with a keyless remote.
Follow this link and you're good to go. Let me know if you have any questions. I've done this myself so I know how to do it. .ehow.com/how_7291758_program -remote-1997-buick-lesabre.html#ixzz1HA YkCKDX
To program a keyless remote for a 1997 Cadillac Catera, first, sit in the driver's seat and close all doors. Insert the key into the ignition and turn it to the "On" position without starting the engine. Press and hold the "Lock" and "Unlock" buttons on the remote simultaneously for about 15 seconds until the doors lock and unlock, indicating successful programming. Repeat this process for additional remotes, and then turn the ignition off to exit programming mode.
To program the keyless entry remote you hold down the lock and unlock keys at the same time while within 10ft of vehicle to make sure you are within range of the remote for approx 10 seconds. the vehicle will alert with a short horn sound. if it does not respond, repeat. should only take 1-3 tries before it's done
To program a 1997 Infiniti Q45 keyless remote, first, sit in the driver's seat and close all doors. Insert the key into the ignition and turn it to the "On" position (not starting the engine) and then back to "Off" eight times within 10 seconds. After the eighth turn, the doors should lock and unlock, indicating the car is in programming mode. Press any button on the remote to program it, and the doors will lock and unlock again to confirm successful programming. Repeat the button press for any additional remotes.
To reset the keyless entry system on a 1997 Mercury Grand Marquis, start by disconnecting the vehicle's battery for about 10 minutes. Then, reconnect the battery and enter the vehicle. Press the "1" and "2" keys on the keypad simultaneously, which should reset the system. After this, you can program new codes if desired.