Pinpoint Test D: All Dimmable Illumination Does Not Dim: Notes
Refer to OEM WIRING DIAGRAMS.
For Expedition, refer to OEM WIRING DIAGRAMS - INSTRUMENT CLUSTER, for addition information.
For Navigator, refer to OEM WIRING DIAGRAMS - INSTRUMENT CLUSTER, for addition information.
NOTE:
Calibrate the instrument panel dimmer switch by rotating the dimmer switch from the lowest backlighting setting to the DOME LAMP position before continuing diagnostics.