Fog Light Relay
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
Remove fog light relay located in driver side junction block. Continuity should exist between relay terminals No. 1 and 2 at all times. See Fig 1. Continuity should not exist between relay terminals No. 3 and 5. Apply battery voltage across relay terminals No. 1 and 2. Continuity should now exist between relay terminals No. 3 and 5. If continuity is not as specified, replace fog light relay.