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Just picked up an 08 3 series mirror with homelink and dimming to try a retrofit into my 135i. I assumed I needed the harness but a quick wire count of harness ends and it seemed like they matched up. I plugged the new mirror in and went to start her up....
and
nothing... the car refused to recognize my comfort access key.
Swap back the original mirror and it starts.
Really? The rear-view mirror is integral to the car recognizing my keyfob?!?!!?
Any thoughts or pointers?
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