1998 Z3M. No remote system. With a key, I can unlock and lock both the driver and passenger doors and the trunk from the driver's door and the trunk. From the passenger door, I can unlock and lock the passenger door with the key but the driver's door and trunk remain locked/unlocked. In other words, the system works as it should from the driver's door and trunk locks, but only manually works from the passenger door.

Testing: After jumping the two terminals in the yellow plug in the door, I've found 12 volts in the red/white stripe wire for the input to the body electronics control module, all the way to the multi-pin plug at the A pillar, past the bends in the wire at the hinge point of the door. I'm reluctant to try to trace the wire behind the glove box all the way to the module.

I thought this was going to a central locking actuator problem. Ideas?