GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 DeVille 🢒 Body and Accessories 🢒 Stationary Windows 🢒 Defogger System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Turn the ignition ON.
  2. Turn the rear defogger switch ON.
    • The indicator light on the rear defogger switch illuminates.
    • The rear defogger is operational.
    • The indicator light does not illuminate.
    • The defogger does not operate. Refer to Defoggers and Heated Mirrors Inoperative .

2

Turn the ignition to the RUN position.
    • The indicator light on the rear defogger switch illuminates and the rear defogger operates.
    • The indicator light turns off and the rear defogger does not operate after a 5-10 minute cycled time period.
    • The indicator light is on.
    • The rear defogger is operating and continues after approximately 11 minutes. Refer to Defoggers and Heated Mirrors Always On .