Rear Defogger Button Stuck

Tests 1 - 3:

Test 4:

SYMPTOM
REAR DEFOGGER BUTTON STUCK

WHEN MONITORED
With the ignition ON and battery voltage above 10.0 volts.

SET CONDITION
The rear defogger button is depressed or shorted to ground for greater than 30 seconds.

POSSIBLE CAUSES
- Check failure
- A/C heater control
- A/C mode switch MUX circuit shorted to ground
- Body control module