Or just run it inside the headliner along the windshield, pull the rubber seal off the top of the door frame, and go down into the glove compartment. Unscrew the visor to get you a little bit more flexibility in routing the wire. Might take 45 minutes, including putting your couple of tools away.
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'16 235i
'15 3500 HD Dually
'13 C4S
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