Anti-Theft Indicator Light
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.
Connect the positive (+) lead from the battery terminal 2 and negative (-) lead to terminal 1, and check that the warning light lights up. See CONNECTOR IDENTIFICATION . If operation is not as specified, replace the light control rheostat.