OK. problem resolved. apparently m-b failed to do a very good write-up on the rf-transmitting mirrors in the owner's manual. and they must have been getting a lot of flak over it as they have, suddenly it appears, commissioned a phone key for these problems. when keyed, your phone is patched through to HOMELINK customer service.

to take advantage of their programming assistance, it is best that you be in your car in front of your garage door. don't waste your time calling from your office or from inside your house.

for a rolling code rf receiver, your mirror needs to have an amber light. the green light versions will only work with single code rf receivers.

anyway, the mirror that m-b san antonio furnished has the amber light and once it becomes programmed into the garage door rf receiver's memory it works perfectly.

the guy i talked with at HOMELINK told me an interesting story about m-b, though. he claims that HOMELINK[a div of johnson controls] has furnished m-b copy for owner's manual instructions, but that m-b decided not to use it. further, he said that homelink offered to supply a separate manual to m-b to include in their manual kit, but that m-b declined. if this story is true, go figure.

my guess is that owners of single code homelink mirrors might be able to open up the mirror and replace green light circuitry with amber light circuitry. pretty certain that the footprint for the electronics will be identical.

happy end of story. now i can dedicate my overhead door remote controller to the e320cab.