The headlights themselves are immaterial to the ECM. However, if Fuse 1 is pulled or is blown--the 20 amp fuse through which the headlights receive their power--that will prevent the starter relay from energizing, which in turn keeps the starter solenoid from engaging. If the starter relay itself is not securely fitted in its socket, that can have the same effect.If the headlights are disconnected, will the Engine Management System not allow you to start to the bike?
I removed and disconnected my headlights to have the headlight bowls powdercoated. I tried starting the bike tonight. The bike will not start.