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Old 12-03-2010, 07:41 PM
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Join Date: Apr 2005
Location: Northern Louisiana
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1986 420 SEL Freaks Out!! What Just Happened??

Washed the 420 this afternoon then took it out for about 5 miles. As I was turning into the drive the headlights, already on, started flashing and some sort of horn-like device started sounding repeatedly. This lasted maybe 5 seconds, then it stopped. I drove up to the garage door and stopped; engine was running normally, etc.
Was this some sort of alarm system? I've owned Her 6 years and never had this happen before.

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Old 12-03-2010, 08:12 PM
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Factory Alarm System Issues

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Old 12-03-2010, 08:34 PM
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Location: los angeles
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Check door handle plugins inside door, most likely water got into plug , dry or seal the male /female plug so water cant get in (if water is found in plug/connector) only front doors have plug water issues
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Old 12-07-2010, 02:02 AM
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Location: east Tennessee (southeast USA)
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My W126 did this about 20 months ago... it did it random for a week, then quit on its own and hasnt sounded off randomly again.
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Old 12-08-2010, 08:35 PM
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W126 Factory alarms suck. You'll want to remove it. It's under the passenger side kick panel. It's a black box with two large wiring harnesses attached, and if the sticker is still on it, it says "Becker Autoradio"

You can just unplug both harnesses and everything will be fine.

1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
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Old 03-05-2014, 05:54 PM
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Join Date: Jul 2006
Location: SE
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'86 420 SEL Freaks Out!! What Just Happened??

Just now ripped mine out with impunity on the side of the interstate. If anyone needs the factory alarm, theres one in the median of I16 at mile marker 157.

Heres what it looked like after a bare handed uninstall.

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