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S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

W220 Alarm Problem

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Old Feb 6, 2012 | 01:41 PM
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porscheplus's Avatar
porscheplus
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From: manchester
S500L
W220 Alarm Problem
My 99 S500L alarm has started going off randomly, sometimes it seems to be associated with the trunk being open or closed.
If you lock the car on the key button the alarm will go off after 30 seconds. If you unlock and leave it unlocked it will go off again after 30 seconds. The only way of stopping it is to leave unlocked and flip the hood/bonnet catch leaving it partially open on the safety device.
Any one any ideas?
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Old Feb 16, 2012 | 03:19 AM
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alkemist's Avatar
alkemist
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W220
Does your trunk ever open by itself?
At this point removing the alarm fuses may not help
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Old Feb 16, 2012 | 12:37 PM
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ALLDATAdiy INFO's Avatar
ALLDATAdiy INFO
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From: California
Mercedes
Any code faults in the system?
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