What is the relationship between the seat belt relay, the interior light, and the alarm system on a w124 E320? My dome and my driver's puddle lamp will not operate ever by opening the driver's door. Also, the driver's door lock will not arm or disarm the alarm system (Nor operate the convenience window up / down sys.) However, all is well on the passenger side.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro