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 circuit is transponder key ECU assy power source circuit.
The voltage applied to terminal +B is the CPU power source of the transponder key ECU, and is always used to determine the condition of the power source.
Terminal IG supports +B power source and detects the ignition switch ON signal.