My 500SEL is equipped with a Derringer 2 alarm system that also locks/unlocks the doors. There is a red clifford LED on the dash.

When I arm the system with the remote the doors lock, parking lights flash, and the LED blinks. There is no chirping sound and I cannot get the alarm to trip. I can unlock and open the doors and drive away with the LED still blinking.

There is some type of switch in the glove box that supposedly has something to do with the alarm but I'm not sure what.

Does anyone no what could be disconnected that would cause this?

Ray

It could be a valet switch that is enabled. Which in effect makes the light flash and dodors unlock/lock without setting the alarm itself I believe.

Either try that switch and see what happens, or take it to a shop that does alarms and have them look at it.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon

Agree with Alon. Valet switch disable alarm, but still locks/unlocks doors (w/o chirp thoough). And yes, my LED will not pulse (blink) when I am in valet mode, but be a steady on.

Try pushing the switch (mine needs the key to be in position 1.. first detent) and see if you can get it working.

GOOD LUCK

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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!)