sounds like I have an alarm!

[telefunkin]

Good day all,
I was poking around my engine, blowing out the idle valve, lubricating the throttle linkage.......Man I gotta go wake up the wife. Be back in a bit!

Ok then, I spied a horn (looks stock) for the alarm I didn't know I had. Read some previous posts that delt with some common problems however could find no info on how to arm/disarm the system. I got it to sound once by locking the drivers side door with the valet key before the passenger door was closed. Or something to that effect?
All the alarms I have had in the past were aftermarket and came with a remote (pretty self explanatory). Could someone be so kind and give me a clue as to how to operate this new found gizmo?

__________________________________________
Brian
1989 300E (157K)

It takes a big dog to weigh a ton