One problem related to wiring has been reported for the 2007 Mini Cooper S. The most recently reported issues are listed below.
2007 Mini Cooper S, hatchback. The passenger airbag (off) light, indicating the passenger airbag is disarmed, is on at all times regardless of passenger. Additionally, the dashboard warning lights for my airbag system and seatbelt are illuminated at all times. The codes identified by the Mini dealership in honolulu indicate the passenger seat occupancy sensor has a fault. Looking under the seat, it could be a faulty wiring harness or faulty connecter as they appear vulnerable to seat movement forward or backwards. The Mini dealership also stated the obnoxiously expensive part was on national back-order.