2003 Tahoe W/Bose Wiring Diagram

I'd like to connect an amplifier to drive a sub for a 2003 Tahoe with the Bose System.

Does anyone have the wiring diagram for the radio and amplifier?  Any tips we be greatly appreciated.

Thanks

Only info I have is for the 01 model but it's probably the same for your vehicle as well.....

If you're trying to tap in to the signal that goes to the factory sub, you're gonna have to get to it.  It's in driver's side rear panel, but you have to take the 3rd seat out first.

The GREEN/ black wire should be positive and the blue/white wire should be negative.  With the radio on, test for voltage across the positive and negative sub leads to verify that you have the correct polarity.  A positive reading means the wire touching the red test lead is the positive wire; a negative reading means the wire touching the black test lead is the positive wire.

Up at the radio I believe the green wire is the switched +12 volt wire you'll want to tap in to for the aftermarket amp's remote turn on wire connection.  HOWEVER, as always I must insist that you verify all wires using a digital multimeter, before connecting to them. 

Thanks, but I neglected to include that I do not have a factory sub.    The Bose amp is located in the center console. 

From what I'm finding out is that I may have to use a device to generate the remote turn on voltage, but I have not verified that.

The wiring for the Bose system is much different than the standard GM wiring.

You could probably just tap in to the +12 volt accessory wire at the head unit's harness, if the radio has such a connection.  I know some of the newer GM radios will actually work with the car turned off, and thus they do not use a 12 volt switched turn on wire.  If that's the case, you either have to find the amp turn on at the amp's input harness, or you'll need to use one of those low voltage triggers on davidnavone.com, and tap in to a pair of amplified speaker leads.

As for the signal wiring, you're probably going to have to end up using a multimeter and a speaker popper to determine polarity and the correct wires.  you want to make sure that you only use the speaker popper on wires coming out of the amplfier (rather than going in to it) and going directly to each speaker, and that the plug is disconnected from the amp first.

Once you find a pair of wires for the largest speakers in the system (probably the ones in the rear) then you can plug the connector back in to the factory amp.  Then with the system turned on, use a multimeter to test for correct polarity using the method I described in my previous post.

Once you've located the wires and gotten the correct polarity, it will just be a matter of tapping in to the these wires for the signal to send to a line out converter.  I'd recommend an external one as opposed to one that might be built in to the aftermarket amp, as they tend to work better and are compatible with more factory systems than the built-in ones.