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Old 11-19-2001, 01:11 PM
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Buzzing noise in overhead

My 96 E320 has a buzzing noise coming from a component located under the dome/map lights just forward of the sunroof. The noise is more pronounced when it's cold outside and almost silent when warm. It sounds like a small motor and runs for a few seconds after the ignition is shut off. If I don't run the car for more than a couple of days the battery (new) goes dead. Any ideas? Thanks in advance, you guys are the best.
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Old 11-19-2001, 03:05 PM
Mike Stone
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Components in overhead panel are the switches, bulbs and the ultra-sonic sensor for the alarm. In some models there is also a temperature sensor.
(In the UK anyway)

I would suggest you inspect inside of panel for a possible short.

This might sound silly, but have you smelt around the panel.
If you are getting a short there should be a typical "Insulation Frying" smell.

If you have access to a Multi-Tester check for any power use when everything is off.

Could just be coincidence - if you are on original battery and colds nights coming now. This always shows up a weak battery.


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Old 11-19-2001, 05:00 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The temp sensor that is in the dome light has a small fan that blows air over the sensor. It can make some amazing noises.

Part# 140 830 00 08. The sensor and blower are one unit a little smaller than the size of a golf ball.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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