Circuit Description
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.
This tuner is used for the wireless door lock system. The signal from the transmitter (smart key) will be input to the theft deterrent ECU through RDA line. RDA and RSSI lines are diagnosed by the theft deterrent ECU, so check DTC also in case of the failure of the wireless door lock system.