RAM 1500 Truck 4WD V8-5.7L VIN D (2005)
Driver/Vehicle Information Display: Description and Operation
Overhead Console
An overhead console is available on this vehicle and includes the following components:
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Front map/reading lamps
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A blue-green vacuum-fluorescent display screen - if equipped with trip computer
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Universal transmitter - if equipped
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Electronic Overhead Module (EOM)
The overhead console assembly is mounted by two snap clips and screws securing it to a molded plastic retainer bracket located above the headliner. The
EOM is accessed by removing the overhead console from the bracket and pulling it away from the headliner.
COMPASS DISPLAY
All the available overhead consoles on this model include Compass information. While in the compass/temperature mode, the compass will display the
direction in which the vehicle is pointed using the eight major compass headings (Examples: north is N, northeast is NE). The self-calibrating compass
unit requires no adjusting in normal use. The only calibration that may prove necessary is to drive the vehicle at 5 to 8 kilometers-per-hour (3 to 5
miles-per-hour), on level ground in a square shaped pattern. This will reorient the compass unit to its vehicle.
The compass unit also will compensate for magnetism the body of the vehicle may acquire during normal use. However, avoid placing anything magnetic
directly on the roof of the vehicle. Magnetic mounts for an antenna, a repair order hat, or a funeral procession flag can exceed the compensating ability
of the compass unit if placed on the roof panel. Magnetic bit drivers used on the fasteners that hold the overhead console assembly to the roof header can
also affect compass operation. If the vehicle roof should become magnetized, the demagnetizing procedure may be required to restore proper compass
operation.
TEMPERATURE DISPLAY
All the available overhead consoles on this model include Temperature information. The temperature displays the outside ambient temperature in whole
degrees. The temperature display can be toggled from Fahrenheit to Celsius by selecting the desired U.S./Metric option from the customer programmable
features. The displayed temperature is not an instant reading of conditions, but an average temperature. It may take the temperature display several
minutes to respond to a major temperature change, such as driving out of a heated garage into winter temperatures.
When the ignition switch is turned to the Off position, the last displayed temperature reading stays in the electronic control modules, (CMTC, EVIC)
memory. When the ignition switch is turned to the On position again, the electronic module will display the memory temperature for one minute; then
update the display to the current average temperature reading within five minutes.
The temperature function is supported by an ambient temperature sensor. This sensor is mounted outside the passenger compartment near the front and
center of the vehicle, and is hard wired to the Front Control Module (FCM). The FCM sends temperature status messages to the module over the
Programmable Communications Interface (PCI) data bus circuit. For more information on the ambient temperature sensor.
