(Let me run into the garage and "Shoot" my forehead with the Infrared Temp Gun.)
Welcome Earthling,
As you spend more and more time [Lifespan Burner] with us here,you'll notice
some of us "Disappear" to a ZONE known as SEARCH or Advanced Search.It's
the Collected (?Wisdom?) of all who have traversed before you.It is Highly
recommended that you SPEND some time Perusing That Resource BEFORE
Tossing out such a Question as has been posed.
If there's nothing there and no one Volunteers info here:
You may best be served by inquiring of the Manufacturer of your Units.
Google Search for Alpine CM2191:
Alpine CM2191 - Google Search
Google Search for Alpine:
Alpine Electronics, Inc.**alpine.com
My Favorite 190 site:
190Revolution - Discussion for Mercedes-Benz 190E W201 Performance, Parts, Tuning and more