I just replaced the front seats of my 3.0i with the ones from my old 4.6is and I'm now facing an airbag warning light, caused by error codes "driver's seatbelt buckle" and "passenger seatbelt buckle". The errors also state "ground fault/resistance too low". So both seats are giving an error. I didn't touch the ignition when the seats were out and the battery was disconnected anyway. Now when clearing the codes with INPA they just come back immediately so clearly there is a persisting problem.

I have already cleaned the seat's electrical connector and the connector for pyrotechnic seat belt tensioner with pressurized air but that didn't help.

Granted that it was three years ago, but both seats were just fine in the 4.6is and it would be odd if both had the same issue now. Not impossible of course. Also I guess there shouldn't be any compatibility issues between E53 seats?

Has anyone had a similar issue or have ideas what to try out or how to diagnose?

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09/2003 X5 3.0i
02/2003 X5 4.6is (non-runner)