It depends on the switch. Often these switches simply go to ground when active or disarmed. For those wires you may just connect to the other end of the switch or ground.
While some switches are disabled if they do not see a ground. For those wires you just cap off.
Now to figure out which is which, get the doors in a position where the bus will start, then turn it off and use a volt meter to check the continuity of each switch.
If that is as confusing as it felt, then do one switch at a time and check to make sure the bus will start after each one is bypassed.