Door Sensor/Switch (For Alarm): Testing and Inspection

1. Using Rotunda 73 Digital Multimeter 105-R0051 or equivalent, measure door disarm switch resistance with key removed from the door lock cylinder.
2. The resistance should be more than 25,000 ohms. If not, replace the door disarm switch.
3. Measure the door disarm switch resistance with the key fully rotated to the end of travel in the unlock direction.
4. The resistance should be less than 200 ohms. If not, replace the door disarm switch.