I connected mine to the accessory wire from the Seicane. So if the radio is on the backup camera is on. This allows me to look thru it anytime I want besides just when in reverse.

Also when I setup the dvr eventually the camera will be powered up anytime I am driving catching all the action

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install