door, the passenger and trunk locks will work with the drivers door but also will lock and unlock independent of the central locking vacuum driven system. These systems are complicated, but I would get a vacuum pump, you can pick up a hand pump in any auto part store and get a dieagram of the vacuum system for the doors and start testing for leaks. The trunk lock won't lock or unlock with the drivers door, but indenpently with will work with the key, the pasenger door works with the central locking and independently. The sytem is designed this way. It is probably the vacuum actuator in the drivers door that is bad.

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Al Lueb
1999 C280 54K miles
1979 450 SLC 144K miles