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I had a amplified bazooka in my 96. It has an auto turn on feature. Are you sure you don't have this? It would sense when there was a signal on the line and turn on automatically. Made installation much easier.
I have decided not to put the bazooka in my 2001. In my 96 I was feeding off the back speakers which worked well. I had read in the C5 Bose system the back speakers didn't get a full range signal and therefor wouldn't work too well with the Bazooka. So the bazooka went in my second car.
Toe - What did you use to secure the tube in the back? In my old car, it was in the trunk and I screwed into the bottom, not sure I want to do that with the C5.
If it doesn't have the auto-on feature, connect the remote lead to the auxiliary yellow switched wire down at the BCM. This isn't linked directly to the radio, but it will at least switch on/off with the ignition.