On my 1985 500SEC, the alarm arming and disarming switches in the doors are completely un-predictable. Sometimes the alarm will arm and be ok, most of the time it will sound when the door is opened. The trunk switch always works and will silence the alarm. Can the door switches be adjusted, or replaced without changing the locks? Or...do I just need to have the remote alarm and lock system installed? The master lock system works perfectly otherwise.

Help, this is driving me crazy having to use the trunk lock all the time.

On your 500SEC alarm switch is part of door handle(if my recall is right)expensive too I will just install after market alarm system forget MB alarm because cost to much to repair.
hope this help.


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MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner