DTC B1217: Rear left door ECU communication stop: Wiring Diagram

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

See DTC B1214 DOOR SYSTEM COMMUNICATION BUS MALFUNCTION (+B SHORT),DTC B1215 DOOR SYSTEM COMMUNICATION BUS MALFUNCTION (GND SHORT) .