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?

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Brian
1989 300E (157K)

It takes a big dog to weigh a ton

So you're saying that your horn is stock (OEM)... or aftermarket??

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

everytime you lock/unlock your car with the key. Just try to steal your own car to see if it works

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J.H.
'86 300E