The drivers door doesn't turn on the interior (overhead) lights when the door is opened (yes the dash sw is in the correct postion). Also the buzzer will not sound when the key is left in the ignition or if the lights are left on. The passenger door seems to work all of the above fine, except it won't lock the trunk and drivers door when the lock is engaged.

The interior floor lamp on the driver's side DOES illuminate when the driver's door is opened.

My fear is that the alarm system will not work if the driver's door is opened.

It doesn't seem like the door switch is defective as the floor light does come on as designed. Is it possible that a connector has been disconnected somewhere? I haven't owned the car for very long, so the previous owner may have had the buzzer unplugged (which actually isn't a problem so long as the alarm works).

Feedback is appreciated.

Bob Cavazos

To check the alarm, just open the drivers window and lock the doors with the key. Wait about a min. and then reach in and unlock and open the door. The alarm should sound.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

Have you check the warning module diode could
burn out (locate above the brake pedal) I have seem lot defect modules just like yours.

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

The driver's side door will not sound the alarm, but the passenger side will during the window down/reach in & unlock test.

Will the diode cause this type of problem (one side)? Also, will the diode cause the interior lights/warning buzzer one one side not to work? You help is most appreciated--thanks for the replies.

Bob Cavazos

Yes the warning module is connected only to drivers door. So that when you leave your keys in the ignition You hear the buzzer, or if you leave the lights on .

The diode is inside of the warning module.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

MB Stars, Benzmac, & M.B. Doc,

Thanks for the great input. The diode was the culprit. Changed it out, and everything works as it should. Thanks again.

Bob Cavazos