Section 01-11: Glass, Frames and Mechanisms
1993 Mustang Workshop Manual
TESTING

Defroster, Rear

 

Control Assembly Tests

Tools Required:

  1. With switch in the ON position, apply 12 volts to Pin L.
  1. Connect Pin G to ground. Indicator should light.
  1. Apply 12 volts to Pin S. The heated rear window symbol on the switch should light up.
  1. Remove all connections to the switch.
  1. Connect an ohmmeter such as Rotunda Digital Volt- Ohmmeter 007-00001 or equivalent between terminals T and G. While pressing the OFF button, the resistance should be zero. With the OFF button released, the resistance should be infinite (open circuit).
  1. Connect an ohmmeter such as Rotunda Digital Volt- Ohmmeter 007-00001 or equivalent, between terminals I and T. While pressing the ON button, the resistance should read 950-1050 ohms. With the ON button released, the resistance should be infinite (open circuit).