Leaderboard

Nope….a couple screws, pull a couple interior pieces and it’s right there. I figured all the coupes would be similar, but you know….. GM. I had tried fixing mine last summer, but I really needed a better soldering iron. I had managed to get it working for a bit though. I traced it back to a bad solder joint on one of the pins where the vehicle side wiring harness plugs in. I could wiggle the connector slightly and get it working. I’ve since gotten better soldering equipment, redid those connections over the weekend….and now it’s back to not working at all. I’m sort of apprehensive to try again though, as the driver side power door lock actuator goes through the RKE module, even when using the door switches. If I screw something up…I don’t want to lose my power locks altogether. Since it’s not a daily, I’ll likely leave well enough alone for now.

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

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.

You're wanting to do this for the STE, right? If I remember correctly, all of the early 1st gen Ws used what is essentially the same radio module. The main difference being that some used a separate display and tape/CD deck (Regal and earlier GP), where as others had everything packaged in the form of a 1.5 DIN HU, with the radio module still being a separate, removable item. When I had my 92 cutlass, I had replaced a non-functional tape deck with one from an 88 Regal with the 5 band EQ, as it was the exact same part....just contained in a vastly different package. My Regal FSM has a section that identifies the various connecter pin outs, and also seems to imply that there is 5 volt signal used to switch between Radio and "Aux" inputs. I'll post up some of the information, as it may help in your case.