RAM 3500 HD Truck 2WD L6-6.7L DSL Turbo (2008)
Fog/Driving Lamp Indicator: Description and Operation
Description
DESCRIPTION
A fog lamp indicator is standard equipment on all instrument clusters. However, on vehicles not equipped with optional fog lamps, this indicator is
electronically disabled. This indicator is located within the odometer/trip odometer Vacuum Fluorescent Display (VFD) unit.
The fog lamp indicator consists of the International Control and Display Symbol icon for Front Fog Light in the lower left corner of the VFD unit. The
VFD unit is soldered onto the instrument cluster electronic circuit board, and is visible through a window with a smoked clear lens located on the lower
edge of the speedometer gauge dial face of the cluster overlay. The dark lens over the VFD prevents the icon from being clearly visible when it is not
illuminated. The fog lamp indicator icon appears in a blue-green color and at the same lighting level as the odometer information when it is illuminated
by the instrument cluster electronic circuit board.
During daylight hours (exterior lamps are OFF) the VFD unit is illuminated at full brightness for clear visibility. At night (exterior lamps are ON), the
VFD unit lighting level is adjusted with the other cluster illumination lamps using the panel lamps dimmer function of the interior lighting thumbwheel
on the headlamp switch. However, a PARADE mode position of the thumbwheel allows the VFD unit to be illuminated at full brightness if the exterior
lamps are turned ON during daylight hours.
The fog lamp indicator is serviced as a unit with the VFD unit in the instrument cluster.
