Switch Test: Supra
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1992 Toyota Tercel, 1992 Toyota Supra, 1992 Toyota Previa, 1992 Toyota Paseo, and 1992 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.
Connect battery voltage to terminal No. 3, and ground terminal No. 4. See Fig 1. Connect 3.4-watt test light between terminals No. 3 and 5. Turn defogger on. Ensure test light lights for 12-18 minutes and then goes out. If switch does not operate as specified, replace switch.