hmmm, that switch for mode is what you are looking for, manual is where you set it, auto is where it sets itself, and i am not sure what autolock is, maybe auto alarm and lock doors, what i would do is this, blow out the switch area (compressed air) move all the switches back and forth, then make sure you return to their current postion, or try the auto setting too. Then check to make sure that your dome light is set to go on with the door open. plug in and see what happens, if nothing is happening it's hard for me to tell you without testing the inputs and outputs of the alarm brain, but it's possible it's bad.
Also, i know this is redundant, but forgot to ask before, did you check all the fuses?(ALL OF THEM)?
well good luck, if you were closer to me i'd offer to look at it. Let me know what you find.