Circuit Description
WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.
This DTC is output when the ECM detects errors in communication between the transponder key ECU and the ECM, or on the communication lines.
This DTC is also output when an engine start is attempted while the ECU communication ID between the transponder key ECU and the ECM are different.
Before troubleshooting for this DTC, make sure that no DTC is detected for in the transponder key ECU. If any key code-related DTC is detected for the transponder key ECU, repair it first.