Front Seat Head Restraint problems of the 2007 BMW 525

Started the engine. Passenger sat in vehicle. The passenger restraint system failure light appeared on screen. I thought it was a glitch. The light appeared on and off for several weeks. Went to an independent mechanic and told that it was the seat mat or sensor and the cost would run around 1500 at the dealer. Was told to check to see if there was a recall. Checked on the website and there was no recall but many complaints about the same problem occurring for the 2006 vehicles.