DTC B1269: Theft Deterrent 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.
DTC B1269 is detected when communication between theft deterrent ECU and body ECU has stopped for more than 10 seconds.