Here's how my alarm system seems to work. Know that I just got my 88 190e last week! First Benz too!

When I unlock the drivers door, and then without opening it, I open the trunk, the alarm goes off. I locked the doors but the alarm continued for 2 cycles. One cycle being alarm sounds, flashing lights, alarm sounds.

It seems that the alarm will not go off when I unlock from the passenger side.

How do you deactivate/activate the alarm. It's not the original radio, btw.

Appreciate the help.