it might need a new battery, that happened with mine.
The 1989 Buick Park Avenue does not come with a remote keyless entry. The keyless remote entry was not available till 1997.
Mine didn't come with a keyless remote.
It was optional.
Keyless entry will have a keypad built into the driver's door handle.
check in your owners manual if you have it.
The dealership scan tool is required.
the keyless entry code is inside the cover in the back where the rear windshield washer container is
Yes, but at the stealership which will cost big bucks.
The positive ( + ) side of the batteries faces down
That operates the ejector seat. :-) Don't you have an owner's manual?
According to the 1997 Mercury Cougar Owner Guide : Each remote takes ( 2 ) coin type , 3 volt lithium batteries ( # 2016 )
Try looking in the trunk on the driver's side inside fender underneath the carpeting.