Component testing procedure
WARNING: This page is about a different car, the 2009 Lincoln Navigator L, 2009 Lincoln Navigator, 2009 Ford Expedition EL, and 2009 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
ILLUMINATION DIMMER SWITCH - COMPONENT TESTING
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Interior lamps circuit | 2 and 4 | Dome defeat | Closed circuit |
| Off | Open circuit | ||
| 4 and 5 | Dome | Closed circuit | |
| Off | Open circuit | ||
| Illumination dimmer resistor | 4 and 6 | Rotate wheel | Ohmmeter will show smoothly increasing/decreasing resistance |