2000 Pontiac Grand Prix Stereo Wire Guide

how do i bypass the factory BOSE amp that is in the trunk. i want to put my alpine deck in my car but i need to bypass the factory amp for my deck to work.

i dont know why you have to by pass the amp in my 01 grand prix gtp i had to just buy a bose surround sound converter and that made my alpine deck work with my factory amp but now i am trying to put an aftermarket amp in place of the factory one to run the speakers inside does anyone have the wiring diagram for the amp?

I had the same problem, I was trying to put a aftermarket stereo in my 99′ Grand Prix and ran into alot of problems. I was going to use the factory amp for the bose speakers and another amp for my subs, I ended up buying a wiring harness which did not work, so I searched around and finally found this:

1999 Pontiac Grand Prix Bose Audio Adapter

Basically this is what it does is the OEM-1 interface is transformer isolated, maintains phase and is linear from 20 to 20,000 Hz. The input connectors plug into the aftermarket stereo and vehicle harness. Just like the factory stereo system, the warning chimes will play through the front left RCA output of the interface. Also, turning on the rear entertainment controls, if so equipped, will make the rear outputs of the interface play a second audio source. Everything just plugs together (Plug & Play). When you want to take out whatever you added or changed, just unplug it and plug in the old factory stuff. The vehicle is back to factory condition. You can use the aftermarket stereo receiver you added in your next leased or purchased vehicle. The OEM-1 also gives you 2:1 gain as well as infinite attenuation. This allows signal adjustment to the correct level between the factory system and what is being added or changed. All four channels are individually adjusted for accurate sound levels. Each channel completely isolates the aftermarket equipment from the factory system to give 100% compatibility in every installation. Plug one end of the AMP-GM21B into the head unit and the other end into the OEM-1. Then plug the RAD-UNV into the factory harness and the OEM-1. Adjust the potentiometers on the OEM-1 and mount the head unit in dash. The installation is complete. This one is only for 98-99′ Grand Prix that have a bose stereo system. Hope this helps!!

1999 Pontiac Grand Prix Factory radio replace with aftermarket radio. Most new radios have both high output wires, or the low output RCA jacks already on them.

The Bose Amplifier in the trunk has a few wires running up to the stock radio. On my 1999 Pontiac Grand Prix with the Bose sound system I found that there is a “remote” wire from the amp that runs to the radio in the dash. There are two connectors that plug into the stock radio.

The smaller plug has only a few wires plugging into the radio. The pink wire is the “remote” wire that plugs into the radio. If your new head unit (stereo) has a remote wire coming from hit, simply wire that remote wire (normally blue??) to the pink wire that used to plug into the stock radio. I clipped the wire a few inches up from the stock plug, and spliced into it with a butt connector, and a few crimps.

I used the High output wires to feed the inputs to the Bose amplifier. If you bought a wiring harness from WalMart or Meijer (Michigan) the install is simple except for the remote wire to the pink wire of the car.

If your radio does not have a remote wire, you can try landing the pink wire to the accessory (acc) conductor for allowing power to the radio when your car is on.

You could also try a toggle switch that allows you to turn on, or off the bose system from the battery to this remote pink wire. Dont forget to turn it off when your done listening to the radio (dead battery :) alert!! )

Hope this helped. Scott

How do you hook up a new HU to a 2001 Pontiac Grand Prix GT? with out the gmso1 harness adaptor? I dont mind if I lose chimes and or whatever.