Pollak 11898 is a nice universal 7-pin harness…I think the OEM harness was made by Pollak.


Connect the pins and connector plug mentioned in post 16946 above, add a trailer module and you’re in business.

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'03 530i - manual swapped - 425k miles
'06 325Cic auto 115k
'05 X5 3.0 auto 158k
'99 E39 528i 5-speed 130k