Re: Aftermarket stereo Questions galore and Backup Camera
I have a 2013 TT - so I do not have the subwoofer. I did replace my headunit and speakers (dash and door), here are my thoughts.
I chose not to connect the backup camera for 2 reasons.
1) Interfacing to the backup camera wiring to the HU was more than I wanted to get into the existing wiring goes to the mirror camera. I am not sure if there is a place you could splice into around the HU. I assigned this task a "too hard, too much work" label.
2) The boot time of my stereo is 20-30 seconds (estimating here). I typically like to get in, crank the engine and start backing up. I did want to have to wait the boot time for the camera to come on.
Power wise, the OEM HU drove the 4 speakers I replaced, also drives the stupid ones in the headliner - I disconnected these. I cannot speak to the sub as I don't have one.
I believe the camera display on the HU would come on when the mirror display would come on - if it was connected like I describe above (reason 1).
Hopefully someone else chimes in who got this working - they are out there.
This post may do better in the "Stereo/Electronics/Electrical" sub-forum.