It could be, or not. It could a be sensor that's detecting something and won't let you start it up because of a problem (i.e., RPM speed sensor, low refrigerant sensor, etc.). You'll have to look at electrical schematics, specific to your car to see where everything runs to. I hate electrical work...ever try to fix a Mercedez? I just gave up and told the guy to take it to a Benz speciality shop, screw 90+ pages of electrical checking!