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Old 01-28-2002, 10:34 PM
Join Date: Jan 2002
Location: Lynchburg, VA
Posts: 52
How can I tell if my 300 E has an orginal alarm system. (broken of course)

The 91 300 E I just bought has an extra horn in the engine compartment, the trunk light won't pull off/out and I hear a clicking noise while messing around in the fuse box. I'm thinking this thing has an alarm that has been disconnected. How can I tell for sure if it has an alarm and is it worth trying to fix if it does? How would a dealer disconnect it if it was going off all the time?

Last edited by DIYBenzer; 01-29-2002 at 12:16 PM.
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Old 01-28-2002, 11:03 PM
pmizell's Avatar
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
To test to see if your factory alarm is connected, lock your doors but leave a back window down -- reach inside and unlock a back door, then open it. If the alarm goes off then it's working; if not... well it's either been replaced or it's disconnected.

To turn alarm off, put key in front door and unlock all doors.



'91 300E, 207k miles

Last edited by pmizell; 01-28-2002 at 11:10 PM.
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Old 01-28-2002, 11:38 PM
Join Date: Jan 2002
Location: Lynchburg, VA
Posts: 52
Is the box behind the fuse box the main alarm unit? It doesn't have any quick access to it?
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Old 01-29-2002, 10:31 AM
G-Benz's Avatar
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Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
Also, the factory alarm just uses the factory horns when activated. If you have an accessory horn, then perhaps an aftermarket alarm had been installed at one time...

Most alarm installers locate the alarm "brain" somewhere inside the dash, usually underneath the driver's side cockpit. The "brain" may still be active (as the relay "click" can still be heard).
Some installers do mount the alarm computer in the engine compartment, but I think that's rare, since most manufacturers don't design them to withstand the heat and moisture that they would be subject to in that location.

Typically, aftermarket installs use black convoluted tubing to protect the wiring harness, so that would be a clue as to where stuff is located...
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car
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Old 01-29-2002, 12:21 PM
Join Date: Jan 2002
Location: Lynchburg, VA
Posts: 52
The engine horn is welded to the side of the compartment. It doesn't look as if it was added. Who knows. Anyone know what the long rect. box behind the battery is? Has a slector switch on top.
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Old 01-29-2002, 12:30 PM
CJ CJ is offline
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Join Date: Jun 2000
Location: Earth
Posts: 1,318
The later model (1989 and on) have a seperate hon for the alarm.
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