I have a Pioneer AVIC-F700BT in my car now. It's a nice unit but it takes 30-40s to boot, so I was thinking if I connect the stereo to the light circuit that drives the interior lights it should boot when the car is unlocked.

The questions are:

Is this signal somewhere in the car side of the stereo harness?

And what do I need to do so the stereo does not shut off again when the voltage drops due to engine start? Are there any buffer power supplies that can drive it for the few seconds?

Thanks

Christian