I have a passenger door open warning. I replaced the door actuator with a new one and the locks work as expected. However the fault remains and prevents me from being able to lock the car with the fob. The horn beeps when I try to lock the car with the fob.

I tried swapping the door ecu with the drivers door ECU and this made no difference.

I've been through all the wiring and can't see any obvious breaks, it all appears OK. Tearing my hair out now trying to figure out where the fault lies, praying it's not the BCM/CJB.

Have you tried the old disconnect the battery trick ?

Yes, battery has been off for a couple of hours and I have the BCM out and stripped it down as much as you can, but I can't see anything obvious, most pf the components can't be seen as they are in between the two boards.

I've traced the signal all the way to the BCM and opened up the BCM. I measuring the appropriate input pin on the BCM PCB the signal goes high and low as the door is opened and closed but reading the BCM data stream for the door and the signal remains OFF = Door Open. In comparison Drivers door goes OFF/ON. A visible inspection of the BCM circuit boards hasn't revealed anything odd looking, so I'm guessing I need a new BCM.

Is the BCM coded to the vehicle? If it is where can I get a replacement BCM setup?

How did you solve the problem? I have the same situation