Check on www.axxessinterface.com for your specific harness but I the only harnesses I can find are ones that retain Onstar/chimes/Retained Accessory Power (RAP). I know in the past there was a basic harness for our trucks that got rid of Onstar & chimes but you also lost RAP. So anytime you turned the engine off the radio would turn off, unlike stock where the accessories remain active for 15 mins. Not sure if that makes a difference to you. But I'm not finding a basic harness, only the full shabang.

But the Metra Axxess harness you could get is the GMOS100 which keeps Onstar/Chimes/RAP and now includes built-in steering wheels controls. That used to be like a $30 add-on module.

 

Best advice I can give you is as follows:

install new HU with no module at all except for steering wheel controls if you have them (Metra Axxess Steering wheel control interface is top notch)

Install amp in cubby hole. Run RCA's from HU to amp, and run speaker wire from amp to speaker OUTPUTs at BLOSE amp in rear cubby hole. This way you use stock speaker wire from Bose amp to speakers.

 

That's basically what I was thinking but what about RAP and my 12V to power the headunit?

 

I have the PAC module and it got rid of the chimes and onstar.

 

What u mean?

 

Keeping the Retained Accy Power(radio stays on till doors are opened)
Also will the Tire sensors still work?
Thanks for the help

 

RAP will still work if u use accessory power from original harness mine does anyway.

Yes tpms still works.

 

Just use the wires in the dash for the RAP and 12v. The one thing you will have to run is the remote turn on wire. I never found the remote turn on in the factory amp. I think it must use voltage sensing on the wires coming from the head unit to trigger the amp, or its always on for the stupid chimes/onstar. Good luck with the install.

 

Don't mean to hijack, there is nothing left of my stock stereo(speakers or radio) if all I want to keep is RAPorgan I just tap for 12v acc and grnd or do I need to keep the module in there? As most of u know we don't have a lot of room back there

 

There is a wire in factory amp harness for turn on, but it will only work with some amps. I believe it was like 5.5 volts or something low like that. It worked with an older kicker amp i had, but wouldn't work with my new stuff.

 

Thanks everyone. All of my parts should be here to install by the weekend.

 

All I am using is constant 12v power and switched power from original harness.

 

And RAP works fine? What color are the wires if u can recall? Thanx

 

Dont have em. Google trailblazer Bose wiring diagram. You'll find it.

 

06 Trailblazer...

A lot of the info you want is here. Including BOSE schematic.

http://www.ss-shootout.com/tunes/index.html

 

Thanx, I forgot about shootout. I noticed that they don't have an acc wire, which I think it gets from somewhere else anyway