I have a 2004 Deville with what I think is the "standard" sound system. No navigation, no bose. It has a sub in the back, 1 speaker in each door, and 2 tweeters in the front corners.
I was frustrated with having to use a FM transmitter to use my mp3 player, considering I didn't have an AUX jack and I didn't have a tape deck (to use one of those adapters).
FWIW, the mp3 player is not an iPod. It uses a 1/8" jack.
So I finally bit the bullet and got an aftermarket Pioneer head unit installed that has an AUX jack, as well as support for USB flash drives and even iPods, which I don't have but may get in the future for this.
Anyway, I had a car audio shop install it for me and they bought a harness to hook it up.
I've been having all sorts of issues with it. For example:
1. Sometimes the Pioneer head unit turns off on its own.
2. The levels move from left to right, even front to back, at times.
3. There was a hiss at first but that was resolved by lowering the volume on the harness. Unfortunately, my max volume is much lower now.
4. Once, the door chime kept chiming over and over, even after the door was closed and I was driving around for 15 minutes. Only happened once.
5. The motor TURNED OFF once while I was driving (dash lights were still on though). I parked, took key out, started it up fine and it hasn't happened since. I'm not certain it's related to the installation of the Pioneer - could be a coincidence - but that's never happened before, and it happened a few days after the install. At that time I was using a USB flash drive. I haven't since because I'm worried that will happen again.
I've brought the car back to the shop and the guy doesn't know what the cause of these issues are (the main ones being the unbalance audio levels and the Pioneer powering off).
The way I understand it, the harness lets me use my existing amp(s). It just re-routes the wires so to speak.
I'm here looking for general thoughts from anyone who may have run into similar problems before, or who has a guess as to what the root cause of these issues is.
For example, was it a bad idea of using a harness? Should I instead, run new speaker wires and use a separate amp?
Are the audio/electrical systems in 2004 Devilles finniky to 3rd party "mods" like this?
Have other people seen these sorts of issues?
Could the cause simply be due to a defective Pioneer head unit?
Any other thoughts?
Thanks for your time.