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  #1  
Old 07-10-2010, 02:54 AM
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Driver's door lock not disarming alarm

My 1993 300E2.8 has developed a strange problem. Unlocking the driver's side door from the outside with the key unlocks all the other locks (including trunk and fuel filler flap) but will not disarm the alarm, and I have to walk around to the passenger side to unlock that door to disarm it.

This used to be just a winter problem which went away with the warmer weather, but it's continued into the summer this year and is getting really old.

Plus, the driver's door doesn't unlock when I unlock the passenger door (but the alarm is disarmed.) This means that I'm always making at least one trip around the car to open all the doors and turn off the alarm, unless I reach in and lift the driver's door lock stalk.

Does anyone have any idea as to what's going on?

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Old 07-10-2010, 08:08 AM
Jer Jer is offline
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In regards to the alarm, there are microswitches clipped to the lock cylinders of the two front doors. Turning the key causes a cam to flip the microswitch in either the arm or disarm position (depending on which way the key is turned). These are momentary contacts. Depending on the part # of the cylinder, you might be able to order a replacement switch. In some cases you have to order the whole lock cylinder with switch, which costs more. The same problem happened with my '94 E320.

For now you can pull out the plastic cap inside the door above the latch and disconnect the 3-pole plug for the ATA microswitch. This will prevent the alarm from being armed when you lock the door.

As for the driver door not unlocking, check for vacuum leaks from the central locking pump to the driver door lock vacuum element.
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  #3  
Old 07-10-2010, 10:55 PM
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thanks for the ideas,im having the same issue with my 89 300ce,left door doesnt operate central locking system,and the alarm does not arm,or go off no matter wich door is locked,then opened from the inside while locked,maybe i need to replace both micro switches,and find the vacum leak.
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  #4  
Old 07-13-2010, 09:57 AM
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Could the microswitches just need lubrication, and that's why they worked in summer but not in winter?
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Old 07-13-2010, 11:51 AM
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Lubrication won't help. The switch is sealed with a rubber boot. The switch will move but not enough for it to click, which you can hear when it does.
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1994 E320 (124.032) 252K (dearly departed in hit & run)
1988 260E (124.026) 301K (sold)
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  #6  
Old 07-13-2010, 12:11 PM
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On the door-lock? I replaced one last week, thought that they were hall-effect.
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  #7  
Old 07-13-2010, 02:27 PM
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Quote:
Originally Posted by babymog View Post
On the door-lock? I replaced one last week, thought that they were hall-effect.
I don't suppose you have a part number, do you?

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