Transponder Key Coil
WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
Inspect the transponder key coil continuity. Check that continuity exists between terminals No. 1 and 2. See CONNECTOR IDENTIFICATION . If continuity is not as specified, replace the transponder key coil. See appropriate STEERING COLUMN article.