RE: What do these button do?
I cannot tell you what the asc button is. My books only show 3 switches on the moonroof's control panel - 2 switches for turning on each of the 2 map lights on either side of the switches and 1 for moving the moon roof. It must be an aftermarket unit. There is nothing in the EVTM that has a set of letters like that. Perhaps you can download a small picture of this and someone can help. My '98 is completely stock right now, so there is nothing there except as stated.
As far as the rear view mirror goes, you may have an automatic dimming rear view mirror set. If you look at the bottom of the mirror in the center, you'll see a switch that will turn it on and off by pushing up on the switch. It should either stay up or down. I don't remember how to set it (whether it should be up or down) and the manual has no instructions, either. Just push it up - it should lower. And then try it at night. Then push it up again - it should stay back up. Try it at night again. There seems to be different settings for the mirror. So, keep experimenting.
The upper center spot in the mirror's glass is a light sensitive photocell that is used along with a rear mounted photocell (facing foreward) to tell if the amount of light is the same or different between the back and front of the mirror. So, say it is daylight. The 2 photocells would get about the same amount of light. But, at night, the back side (or front looking) photocell shows it is dark out and the car behind you has it's headlights shining brightly on the rear facing photocell in the mirror. In that case, the mirror will darken by itself instead of you - having to move a tab below the mirror to put it in a darkened position. It will also darken the left driver's side door mounted rear view mirror. They are interconnected. The mirrors will also lighten back up if you place the gear shift in reverse as a safety precaution.
The module attached to the center rear view mirror's bracket is actually the vehicle's electronic compass. That is set according to your location (in your case, California, or zone 4). The operation and setting proceedure is in your owner's manual page 24, 25, and 26, which should be in the glove box. It is not the garage door opener.
The garage door opener (if equipped) will be on the opposite side of the driver's side sun visor. You can see it (if you have it) by looking up at the visor when it is in the up position. On the rearward right side (front side when down), there should be 3 buttons and a small triangled LED light in it. You either have it or you don't. The only way to get it is to replace the complete visor with a visor that is equipped with one. You cannot install one in your car's visor yourself (according to Ford). Their response is - if it does not work, "replace the visor." You can use an equipped visor to replace a non equipped visor. The wiring and mounting is the same. Just locate the same color visor.
The instructions for setting and operating it are on page 57 of the owner's manual.
If you need more help, ask. But, get a picture of the asc switch. You have peaked my interest.
It seems that the asc switch is already answered. My '98 was one of the 1st off the line in '97, so it does not show the option or the asc standard switch.
