i've been thinking about doing a double din install in my 2001 Pontiac bonneville SSEI with the BOSE system and on-star.

I understand that I need the GMOS-09 adapter, but that adapter has inputs for 8 speakers, which is what my car came with. However all of the headunits that I see all say that there is only 4 channels (systems like 50W X4) will this work with the 8 speakers that are in the car? Will I lose half of my speakers with an aftermarket? Or will 4 channels be sufficient to run all original speakers and sub?

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2001 Pontiac Bonneville SSEI

With either adapter it feeds four channels into the bose amp which sends the signal out to all of its speakers. You really only have 5 channels. Front left and right, rear left and right, and rear deck which is mono. As long as you wire correctly with the adapter the speakers will receive signal

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2000 ssei gone but not forgotten

Current fleet:
2009 G8 v6, 2009 Avalanche LTZ, 2013 Volt

Thanks for the answer.

Also I am thinking about getting a Double DIN headunit that is affordable (tight budget preferably under $200)
I would prefer something with a bluetooth and touchscreen function, any suggestions?

Also I know I need the GMOS-09 adapter, a double din install trim, is that it? Do I need to buy an adapter for the FM/AM radio function to still work? Sorry about all of the questions, just want to make sure I only buy what I need.

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2001 Pontiac Bonneville SSEI

Pioneer head units are pretty nice for their price range.

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-Car Guy Carl
"Penelope" - 2003 SLE - 247k Miles
"Sydney" - 2000 Honda S2000 - 98k miles

You will need an antenna adapter. Honestly is has been about 6 years since I installed my stereo. I don't remember what antenna adapter you need. I do remember that it is also used by some Volkswagen cars too

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2000 ssei gone but not forgotten

Current fleet:
2009 G8 v6, 2009 Avalanche LTZ, 2013 Volt

Alright, thanks for the suggestions. I'll get an antenna adapter, but I don't mind not retaining the warning chimes, they aren't THAT important are they? If it's all right and I don't lost any other important functions is it possible for me to use a cheaper adapter such as the one in the link for the premium bose 8 speakers in the '01 SSEI, or will it not support the amplified system?
http://www.sonicelectronix.com/item_558 ... -GM07.html

Also the unit I am thinking about getting is this one here: http://www.sonicelectronix.com/item_436 ... 40NBT.html
My only concern is that because it is a flip out screen it will get in the way of other controls and won't look as good. Has anyone had experience with a flip out in these cars? If it won't fit i'll just opt for a more traditional double din in dash setup.

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2001 Pontiac Bonneville SSEI

If you use a regular harness you may have to run a remote wire to the Bose amp.to tell it to turn on I'm not sure. Also are you familiar with the fact that you have to trim out some plastic behind the radio? Most aftermarket radios are too long and will stick out unless you remove the plastic from behind there

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2000 ssei gone but not forgotten

Current fleet:
2009 G8 v6, 2009 Avalanche LTZ, 2013 Volt

Yes I'm aware that I'm probably going to have to do some trimming.
I wanted bluetooth, touchscreen, navigation, backup camera, but I don't have $500 for a top of the line headunit.
I ended up going with a $200 PYLE unit, and the NON GMOS-09 harness, I'll see if it all works out, if it doesn't or I don't like it both items do have a return policy. Here is the link to the headunit I ordered, it seems to get somewhat reasonable of reviews really good or really bad, may not be the fanciest but on a tight budget in college, it works
http://www.amazon.com/Pyle-PLBT72G-Moto ... B008KYKY0O

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2001 Pontiac Bonneville SSEI

I actually canceled the order of the Pyle system because it is a flip out screen, and it doesn't look like it would fit due to the dash bezel overhead. So I tried to stay in the same price range and found this $215 double din, it's a chinese brand but a "reputable" one.
http://www.eonon.com/Car-GPS/2-Din-Car- ... G2104.html
For the price it has a lot of features:
AM/FM radio, cd/dvd, aux, usb sd card,ipod, etc.
Bluetooth calling and receiving, phonebook, and audio streaming
6.2" touchscreen with a "fast" (for a headunit processor) The buttons light up in 7 different colors and there are volume knobs instead of buttons, which i prefer.
GPS, looks pretty good for this price.
Built in amplifier (4 channel output)

My question here is, I have already purchased the GMOS-09 but will everything still be compatible if this headunit has a built in 4 channel amplifier, will it replace my bose system amplifier? Anything special that I have to do because it has a "built in amplifier". Thanks for any help i'm new to radio installs.

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2001 Pontiac Bonneville SSEI

You can use the line out audio and connect the 4 outputs to the Bose Amplifier, as well as the amplifier enable on the GMOS-09. If you pull the bose, you lost the crossover distribution to the 8 speakers. But be careful which wire you cut. The labels were reversed on my GMOS-09 adaptor and it did not work until I cut the other wire. You need to cut the blue/white wire next to the 2 pink ones (B3) and keep the one that is 6th from the end wired to the amp. (B6) Also the solid blue wire that comes from the doc-lock need voltage to enable the antenna module so your antenna is turned on. (A3)

The info for the says something about steering wheel controls but is not very specific. Most of the aftermarket adaptors only work with Kenwood, Alpine, Pioneer, and a couple other popular brands.

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bobgto65

2004 Bonneville GXP 62,000 miles purchased 04/13
2009 G8 GXP PBM, M6 9580 miles, no mods, sold 08/15
2009 G8 GT SBM 36,000 miles, modded 430 whp
2002 Bonneville SSEi 203,200 miles (sold 3/2014)

I honestly think that the 12 year old stock BOSE will sound better than the amplifier in the headunit, so you're saying if I want to keep the 8 speaker bose amplifier all I need to do is connect the 4 outputs without cutting any additional wires? Also i'm fine not having steering wheel controls, I mean the thing is within arms reach, so saving $50 on an adapter is fine by me.

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2001 Pontiac Bonneville SSEI

Yes just use the four line out audio outputs and not the amplified ones. Let us know how your unit works after the install.

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bobgto65

2004 Bonneville GXP 62,000 miles purchased 04/13
2009 G8 GXP PBM, M6 9580 miles, no mods, sold 08/15
2009 G8 GT SBM 36,000 miles, modded 430 whp
2002 Bonneville SSEi 203,200 miles (sold 3/2014)

Can someone clarify something for me, does the gmos-9 Have rca inputs to connect a preamp output?

I have the PAC c2rgm32r and it does not have them, my system is hooked up via the amplified outputs from the head unit directly into the Bose

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2000 ssei gone but not forgotten

Current fleet:
2009 G8 v6, 2009 Avalanche LTZ, 2013 Volt

The GM0S-09 does not have RCA jacks. It has pigtails. There are 8 wires to hook up to the line outputs on the head unit. I think the RCA plugs are the line voltage so just get one pair of RCA plugs to RCA plugs, cut them in half and strip the cut ends wire to the GM0S-09. Just connect the right ones together and you will be fine. L front positive to left front positive, left front negative to left front negative, etc.

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bobgto65

2004 Bonneville GXP 62,000 miles purchased 04/13
2009 G8 GXP PBM, M6 9580 miles, no mods, sold 08/15
2009 G8 GT SBM 36,000 miles, modded 430 whp
2002 Bonneville SSEi 203,200 miles (sold 3/2014)

Hi guys, I'm having some trouble here. I've started cutting away the plastic at the back of the radio cavity but i'm having trouble where the plastic is connected to the ribbon harness, how can I separate the two?

Also, I tested the new headunit by plugging in the harness and everything powers on and works correctly, but I am getting on sound at all. Are the amplifiers not being turned on? Is there a missing connection? Everything is powered and illuminated correctly, but I get no sound through Radio, Bluetooth, AUX, etc.
There was an amplifier turn on connection for the aftermarket unit and one for the GMOS-09 I soldered the two wires together, was that not the right step? Am I supposed to wire it all the way to the amplifier in the back? I assumed that the stock harness which is connected to the GMOS-09 which is connected to the Aftermarket unit would get a signal to turn the amp on, but I am getting no sound at all, kind of disappointing...

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2001 Pontiac Bonneville SSEI

There is a wire you have to cut in order for the adapter to send the signal to the amp to turn on.
I don't know which one because I don't have that adapter, someone will chime in with it.

As far as the ribbon cable goes you can unclip it it from the plastic and slide it up and push it back behind the dash same thing for the antenna plug

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2000 ssei gone but not forgotten

Current fleet:
2009 G8 v6, 2009 Avalanche LTZ, 2013 Volt

Hi, thanks for the response.
I did clip and isolate the wire for the 00'-01 model. It still didn't work.

I did some digging through these forums and found out I needed to clip the pink power wire on the BOSE amp and route it to the turn on in the harness. I did that and got no sound, the amplifier was still dead. So my next idea was to feed the amp power through a fuse. I tried the Retained accessory power fuse in the backseat, and the speakers worked but they made next to no noise.

I tried the larger Amplifier maxifuse under the backseat, same result. I get the speakers to turn on with a fuse to the pink wire, only problem is that they all sound terrible and fuzzy, I have to turn the headunit's volume all the way up to get any sound at all. Everything is working on the headunit now, except for the sound still.

I know that there is a built in 4X50 Amplifier in the headunit, I didn't think that it would clash with the 8 Speaker Bose amplifier system but now i'm having second thoughts. Anyone here have a suggestions? I'm out of ideas. I think it isn't getting the proper power level or signal or something to turn on the amp, I'm no expert at this though. Thanks for any help you can provide.

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2001 Pontiac Bonneville SSEI

Well before you do anymore let's confirm some basic stuff, when you connected the harness did you connect the blue/white wire coming from the head unit?

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2000 ssei gone but not forgotten

Current fleet:
2009 G8 v6, 2009 Avalanche LTZ, 2013 Volt

Yes I tried connecting it to the GMOS-09 harness blue/white wire, when that didn't work I wired it back to the pink wire on the amp and it still didn't work. The only way I can get the amp to turn on is when I connect the pink wire to a fuse under the back seat. The quality and volume is just terrible, I doubt the speakers are blown or anything, I'm just not sure if the headunit or the amplifier are to blame here.

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2001 Pontiac Bonneville SSEI

How are the speakers wired up?

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2000 ssei gone but not forgotten

Current fleet:
2009 G8 v6, 2009 Avalanche LTZ, 2013 Volt