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Should be 2 or 3 bolts on the seat bottom facing the rear of the front seats. Remove the bottom seat cushion and then you will see the bolts that hold the back seat cushion on.

Locks cycling just means part of the receiver is okay. Doesn't necessarily mean it's receiving a signal correctly. I've had bad ones do that too. Although it's definitely easier to rule it in or out with multiple fobs.

Unfortunately, they are indeed Xmas tree type. I used a standard trim panel puller to remove them. I was able to reuse mine after pulling, but it's possible they lost some strength after pulling.

If it's a coupe, it's where @Black92GS showed a few posts up. If a sedan, on the back deck as @jiggity76 shows. Regal coupes had a much smaller rear deck due to the more vertical backglass. Top is sedan, bottom is coupe.

I don't remember having any shift interlock issues when my turn signal switch was bad...but I don't usually put it into gear less than a few seconds after startup and that was about 7 years ago.

I've never been able to SEE the bad solder joints, and I think the glossy conformal coating would probably hide them if there were some. I've always just cleaned off the coating and resoldered the joints anyway. That's always worked. I think most people who have done it had the same experience.

Thanks that diagram helps. Got my neighbor to help. Putting these photos up for anyone else that finds this thread. Two red clips at the top of door, one white xmas tree clip, and a clip on the inside of the car that requires you pull the panel forward to release.

Yeah, I hate those one time use clips. I don't have the factory service manual, only parts catalogs, but there appear to be no fasteners for that part other than one staple (#3) towards the bottom. Not sure if that staple has to come out. It looks like the same annoying clip setup my Cutlass Supreme has along the top edge. If I recall the metal clip parts have sharp barbs and dig into the plastic, so some wear to the plastic happens every time you pull it. If the plastic tabs don't break off, they usually go back on and fit well enough, but it's not something you want to have to pull often. Looks like something near the top of the quarter glass and I'd guess that's an xmas tree type clip.

That's interesting. My bad...I thought they were all in the same location. My Cutlass coupe is also in the back shelf area. The rear glass is allowing more space for it I'm sure than a Regal coupe.

The receivers are mounted up in the back glass shelf area. The upper rear seatback needs to come out...which means the shelf also needs to come out. Then, to get the shelf out, you have to pull the rear quarter glass interior plastics that go around the glass. GM layered these pieces. Here's my 93 Grand Prix STE sedan. It won't be identical, but it will be the same process and in the same location. That black box up against the rear glass...that's the receiver.

It's actually a very easy install. I did it on my '91 Cutlass Supreme coupe on my lunch hour from work. If you're going with an aftermarket head unit, be sure to spring the extra few dollars for the wiring harness adapter, which allows a plug-and-play connection between the new radio and the car, without cutting any wires. You can easily do the installation in under an hour. When I was married, it made a fun afternoon project with my then-stepdaughter to replace the dead radio in her mom's Jeep Grand Cherokee. I taught her how to use a soldering iron as part of the process, and she had a great sense of accomplishment when we turned it on and put in her favorite CD to test it out.

No problem. Pay attention when ordering a replacement though, as there seems to be different part numbers based on whether the car has column or console shift, and whether it has steering wheel controls. The key fob not working is highly likely to be bad solder joints in the keyless entry module. There is a write up on here about repairing them. Extremely common issue!

Thanks that's helpful as I was wondering why I couldn't find many hits for "multi function" switch. The key fob also doesn't work despite fresh coin batteries. What could I be looking at? Took my elderly father for a ride and he is happy to see a car like this still going!

That would be the turn signal switch. Not terribly hard to replace, but you do need to pull the airbag, the steering wheel, the clock spring and the lock plate to get to it. Sounds like the Brake shift interlock is acting up. What I can't recall is whether the turn signal switch issue that causes the left/right brake lights to not illuminate correctly also causes issues with the shift interlock not releasing like it should. I'll let someone else chime in regarding that.

The car runs great so far. I've driven it back to the previous family to show off that it's still running, which they hare happy to see. One issue is that the tail brake lights do not work, but the third small light on the windshield does. I read some other similar issues, and it sounds like the "multi function switch". I think other places have called it a "combo switch". If I pull the signal switch back slightly, but not all the way to engage highbeam, then the brake lights will work. Does anyone have the particular part model or "proper" name for this part? I'm also seeing that it's call "turn signal" switch. I'm not very car-inclined. I'm assuming is discontinued and hoping there's an aftermarket solution.

yeah I like both of those. I can’t help but think of the early 2000s Cadillacs that had LEDs for the rear taillights and brake lights that were more…crystallized? Only way I can think of to describe it. I really liked how those looked. Not the best picture I could find but I really liked the way these looked.

The lack of cross braces is a series 1 3800 thing. I have yet to see a 1st gen Regal with a series 1 3800 have them. Regals with the 3.1 and 3100s had them, as did the 96s with the series 2 3800. No clue as to why it’s that way though.

You're welcome.