Mercedes 1995 S320 Weird set of problems

My 1995 S320 suddenly developed these problems all at once
1 Central locking does not work with key or remote or inside lock switch on console 2 When you open trunk the small lift handle does not pop out
3 When you open the front door ( or others) the foot lights do not come on 4 No rear seat light operate and no trunk light 5 When you turn on the rear reading lamp it turns on the front overhead console lights adn not the reading lamp 6 When you turn the engine off the key buzzes without the door being open 7 Sometimes there is a stuttering sound from the starter when you start the engine 8 The front center console light stay on after you manually turn them off for a short period as if you had opened the door and closed it. 9 There is a clicking noise in the right glove box area sort of a relay sound 10 The right front door is not closing very smoothly at the 2 normal hold open areas and is a little noisy Any ideas from anyone. My mechanic seems flustered.
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In much simpler M-B models there's a "seat belt warning device" which connects the doors, ignition, overhead light, headlights ON and seat belt warning buzzer. Your model is more sophisticated and so adds to the former. Anyway, I suggest you consider that device or its equivalent as the starting point for this investigation.
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Suggest you focus on the seat belt warning device. It's wired into many of the components you mention.
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