Local Area Network (LAN)
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.
The LAN is a communication circuit between the body ECU, left rear door ECU and right rear door ECU. Diagnostic trouble codes are not output if a fault is detected in the communication circuit between the body ECU and either rear door ECU. Faults in this system can be identified through symptom diagnosis.