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Old 12-06-2003, 12:12 PM
pmizell's Avatar
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
Question Failed vacuum locking system with a quirk

Hello friends, I need some advice --

My vacuum pump appears to be going south -- locking works sometimes, other times it doesn't. When it doesn't, I'll hear a clicking sound coming from under passenger side dash and my headlights/taillights will flash as if the alarm has been triggered. (no horn sound though)

Until I solve the vacuum pump problem, is there a way to disable the alarm system, save removing the "C" fuse? It's getting very annoying having to drive with my lights on, to keep them from blinking.

'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi
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Old 07-28-2004, 10:53 PM
Registered User
Join Date: Jul 2003
Location: Richmond Hill
Posts: 149
Lock alarm problem


Have you checked the floor under the front passenger carpeting for water damage? The alarm ecu is down there under a plastic panel.

Also check connections at the vacuum pump under the rear seat right side, in a foam enclosure.

Hope this helps,
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