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Jassper,
I'm very interested in your issue. I will assume that you bought the vehicle with this alarm, otherwise you would have returned it to the person who installed it, right? Also, after some searching, I see you 300D is a 1992, right?
I just installed keyless entry into my vehicle. My 94 E420 also has the convenience feature that closes the windows upon lock. In order for it to work, a Timer Relay had to be installed to continue sending power in order to close the windows. You probably have this as well. Because of the convenience feature, you need to wait at least 10 seconds (or maybe more depending what the timer relay is set to) between uses of the remote... otherwise crazy things happen like you are seeing.
My recommendation is disable the factory alarm. The factory alarm should have 2 plugs on it, a longer one and a shorter one. I'm not sure what you lose if you disable both plugs... so you'll need to test. Better would be to cut the factory alarm "ARM" wire which "should" be the yellow wire with blue stripe on the smaller plug. Don't cut it there, as it will be hard to reconnect. I believe you can get to that wire from the passenger footwell along the door side. You'll need to carefully cut open the wire sheath. Also, the factory "DISARM" wire should be the green wire with blue stripe... should you need to cut that one as well (although I don't see why you would). Again, you'll have to experiment.
Is there a red light on the dash that blinks when the alarm is on?
Anyway, please return with your findings. I will be replacing my keyless entry system with a keyless/remote start alarm shortly (when I decide which to buy) and installing myself. Can't stand the thought of Best Buy or Circuit City getting into my car. I will probably disable the factory alarm the same way... so I await your findings.
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