Forums

She dont look like much kid but she's got it where it counts...    

It's not an official "aux" input....it's the line level audio input from the cassette or CD player.  Based on what I see in the FSM, there is a 5 volt signal sent to the radio module when one is inserted, which triggers it to switch from radio mode to the tape/cd input. In theory....you put a switchable 5 volt signal on the correct pin and tap the audio lines....you can add your own audio source and switch between sources.  I know your setup is different...however my 92 Cutlass used the 1.5 DIN HU, and it used the exact same radio module that my Regal did...it was just bolted directly to the HU instead of being tucked away elsewhere.  If the GP also uses that setup, the pinouts/wiring diagrams I posted might help in determining how you could add a Bluetooth module.   

What would the factory have used “aux input” for?

Wow, what are the odds of this coming up again. I just redid a couple of these modules. At one point It got bad enough that I built a test jig for them, really made testing them that much easier. Had no idea the regal ones were there, seems like an odd location. I assumed they were all in the rear parcel shelf.

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.