Echo the above comments and especially check your ground connection. In my E39 and E60 hardwires, I grounded to one of the screws on the sunroof motor.
Seems the green-brown wire in this area has consistently been the ticket for power over the model years, IIRC.....
I need to do this mod soon to get rid of dangling wires...
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Garage: 2020 Porsche Tycan 4S
2018 Porsche GT3 Touring, 58 356 Coupe
2014 McLaren 12C Spider
2004 Ferrari 360CS, 07 Lotus Exige S
Former M cars: Euro E30 M3, 01 E39 M5, 08 E60 M5, F10 M5, 18 M2Comp
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