DTC B1299: Rear LH seat 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, B1215: DOOR SYSTEM COMMUNICATION BUS MALFUNCTION (+B SHORT), DOOR SYSTEM COMMUNICATION BUS MALFUNCTION (GND SHORT) .