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In the GP it's mounted to the topside of the right rear parcel shelf next to the speaker.

Appreciate the response. I’ll see what I can do this weekend.

I could be wrong this was a long time ago. In my 1991 Grand prix my keyless entry did not work at all. Figured out the relay was getting power but not doing anything. If I recall it is under the rear package tray? I remember getting in the trunk at one point, but that could have been my convertible. I did also remove my rear interior panels, but can't remember if it was for the keyless entry module. Once you find it, just open it up and look for bad solder joints and touch them up. That's how I fixed mine.

Is it a coupe? In my Regal, it’s behind the passenger side rear interior panel. I believe all of the 1st gen coupes, save for the convertibles have them in a similar location. It’s roughly behind the red circle.