Dale, our 93 CC has the same small button. It is connected to the alarm system. Turn the ignition key to the "on" position and push that button to disarm or clear the system if the remote does not work. Our red light stays on solid when ready to arm, flashes steady when armed, and flashes out a code when its been "tripped". Your horn or siren may have been bypassed or disconnected (0urs was when we purchased the bus). We have one dimmer for all dash lights and switches on the dash. Our back up alarm mute is labeled as such.
so many buttons, so little time!
Mike K