Planning on taking off rear panel to get the speaker wire to my amp, and to do that you have to take off the b pillar panel, which has an airbag behind it. What precautions to make sure it doesnt go off?

 

one other thing related to the amp-which fuse is good for the remote wire. I want one where it only runs when the engine is on. Would the headlight one be good, or is that too much current (40a)

 

It has been a while but for the B pillar cover removal you will need to pull out the ambient light cover. Careful pulling out the cover, they need to be pulled out straight. Then there is a screw (T20 I think) behind the cover that needs to be removed. Unplug the battery and you should be fine. The airbag comes from the roof so you should be fine.

I tapped into the voltage of the cigarette for the remote turn on. It only turns on when the car is turned 'On'.

 

Yeah I just found a screwdriver. I have an iphone charger that i took apart but im not sure how to wire it. I know that red goes into slot but im not sure what to do with the white (ground) wire

 

Any clean spot of metal on the car is fine for a ground connection.