High-Mounted Stop Light Assembly
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.
Using the ohmmeter, check that continuity exists between terminals. See CONNECTOR IDENTIFICATION . If continuity is not as specified, replace the bulb or light assembly.