Bypassing Factory Amp

Try googling around for a service manual. You may have to pay for it but I found one for my 2010 vehicle for only like $20 and one of the documents is a wiring document for the entire vehicle including the factory amplifier stuff.

you should be able to just connect the remote wire on both harnesses.

I have no idea where the remote wire is Checked online and people said it was a pink one but I dont see a pink one in here.

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so no blue wire with a white stripe or solid blue wire?

you're playing with the Class II Data Bus system and by not buying the GMOS adapter that retains safety chimes and other data you have compromised the safety of the vehicle. The ONLY approved method of replacing the head unit is to buy the appropriate GMOS adapter. A bypass of the safety chimes is not recommended and you are proceeding at your own risk in doing so. (example: since the seat belt chimes will no longer work, if someone doesn't wear one and the vehicle isn't in an accident, they can claim that their injuries are your fault because there were not reminded by the chime, and because you bypassed a known safety item, his insurance company can choose not to cover him.) in the eyes of the law, bypassing safety chimes is like removing air bags.

there is no ignition wire or turn-on wire because of the data bus system. the GMOS-04 adapter will give proper ignition as well as amp turn-on/amp interface.

Metra Online

http://www.metraonline.com/files/products/INSTGMOS-04_web.pdf

list of the GMOS-4 features you retain:

• Provides accessory (12-volt 10-amp)

• Retains R.A.P. (Retained Accessory Power)

• Used in amplified systems

• Retains chimes

• Provides NAV outputs (Parking Brake, Reverse, Mute, V.S.S.)

• ASWC harness included (ASWC not included)

• Retains OnStar/OE Bluetooth

• Adjustable volume for chimes and OnStar

• High level speaker input

• USB updatable

• Retains balance and fader

It's not a Bose system but external amps are common regardless. Until he replaces all of the speakers you will reuse the stock amp and their built-in filters.

i know the cost of the harness is steep, and to make matters worse they are also unreliable. If you want to do installs for your friends, you need to do them correctly and not be a hack. Doing a correct install means buying the necessary interfaces and not compromising the vehicle's safety or other features.

The amps probably got an issue. Go to the amp, pull the plugs, find the output side and try to pop the speakers. If they pop you either have an input related issue, the amp isn't being turned on or the amp has a problem.