DTC B1212: Front Passenger Door Ecu Communication Stopped: DTC Detecting Condition
WARNING: This page is about a different car, the 2003 Lexus ES 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
No communication has taken place between front passenger door ECU and body ECU for more than 10 seconds.