bought 2006 e53 a month ago got after market sat nav with can-bus decoder plugged in with iso harness everything ok except steering wheel controls dont work for radio cruise is fine checked all fuses and fine any help pls also when parking and foot on and off brake a creaking from back hav put silcone on all ball joints and brake fluid in bushing still samme could it be discs cos pads are fine thats in advance guys
andy
andy