My seat belt assistant stopped working ... wouldn't come out. I ran a diagnosis and there were a whole heap of errors in different modules. Cleared them all and it started to work again. I think it is important to check for error codes before replacing the arm.
2007 E92 6MT - Silverstone II with /// Performance Exhaust with ACM Test Pipes and BPM Sport Stage II Dev-Tune - Proper engine warm up, 12-monthly oil change, Castrol TWS 10w-60
2014 F15 X5 3.0d