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interesting project, i hereby subscribe to see the progress...
couple pointers...
wi-fi camera - i would suggest a hardwired camera, as wireless solutions unfortunately do not always work as advertised (been there, done that)..
The car is not in "transport" mode, as you are driving it... or, is it? elaborate on this point, i'd like to learn more about this statement... maybe i need to do something to mine too...
you need to check the power requirements for your phone - case in point, my HTC was shipped with a 1 A (1000mA) power supply. withing first few days I got a message indicating that the phone was using more current than the charger was supplying...
I got myself a 2A (2000mA) charger, the situation improved slightly, as i did not receive that nasty message as often but nevertheless, 2A was not enough... finally, i hardwired a 3A (3000mA) supply and was able to use Tune-in and Waze simultaneously, without draining but actually charging the phone while using it in the cradle... just a heads up on the power supply for the phone...
if you are not using the factory BT module (ULF), and can get rid off the possibly installed TCU, you can locate the 54-pin connector in the trunk and rig up a set up when the radio mutes for a phone call - there is a pin that needs to be grounded inside that 54-pin connector, and when it is grounded, the radio mutes, CD pauses, and the audio comes from the car speakers... requires venturing into the pinouts - i don't remember off the top of my head, but i had done this about 10-15 years ago to my E39 (same hardware as E53)
I am not sure which power you are referring to, that is always on - the cigarette lighters are wired directly to battery, via couple sets of fuses... there are ignition hot circuits, and i personally use wake-on-LAN setup, when the direct power from the battery is controlled via relay by a circuit that is alive when the car is awake...
have you seen some of my attempts at resolving the outdatedness (it is not a real word!!!) of the E53 electronics?... lol...
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