I have issues with the left door jamb switch missing in my car. I have tried connecting the 3 wires and only one of the wires when connected to the ground wire will turn the lamp on the drivers door on. The other wire does nothing and the dome light is not working. Nor does any connection of the 3 wires prevent the dash alarm from dinging unless the key is in the run position. I suspect a problem with the timer unit, but don't know where it is located so I can either repair the unit or track down wiring changes that may have been done in the past. The door jamb switch available new has only one connection and is not the correct switch for my '85 30ZX 2+2. Looking at the schematics I can't see why inserting a diode or two around the door jamb switch would not allow me to use the single contact switch once I have the timer unit working.