Challenger V8-5.7L (2010)
emissions systems, cooling systems, lighting systems, safety systems and many other convenience items. The instrument cluster is installed in the
instrument panel so that all of these monitors can be easily viewed by the vehicle operator when driving, while still allowing relative ease of access for
service.
The microprocessor-based CCN hardware and software uses various inputs to control the gauges and indicators visible on the face of the cluster. Some
of these inputs are hard wired, but most are in the form of electronic messages that are transmitted by other electronic modules over the Controller Area
Network (CAN) data bus or the Local Interface Network (LIN) data bus. The CCN is the master node for the LIN data busSee: Powertrain
Management/Computers and Control Systems/Information Bus/Description and Operation/Communication - Operation.
The CCN microprocessor smooths the input data using algorithms to provide gauge readings that are accurate, stable and responsive to operating
conditions. These algorithms are designed to provide gauge readings during normal operation that are consistent with customer expectations. However,
when abnormal conditions exist such as high coolant temperature, the algorithm can drive the gauge pointer to an extreme position and the
microprocessor can sound a chime through the on-board audible tone transducer to provide distinct visual and audible indications of a problem to the
vehicle operator. The CCN may also produce audible warnings for other electronic modules in the vehicle based upon electronic tone request messages
received over the CAN or LIN data bus. Each audible warning is intended to provide the vehicle operator with an audible alert to supplement a visual
indication.
The CCN circuitry operates on battery current received through a fused B(+) fuse on a non-switched fused B(+) circuit, and on battery current received
through a fused ignition switch output (run-start) fuse on a fused ignition switch output (run-start) circuit. This arrangement allows the CCN to provide
some features regardless of the ignition switch position, while other features will operate only with the ignition switch in the ON or START positions.
The CCN circuitry is grounded through a ground circuit of the instrument panel wire harness.
The CCN also has a self-diagnostic test capability See: Testing and Inspection , which will test each of the CAN bus message-controlled functions of the
cluster by lighting the appropriate indicators, positioning the gauge needles at several predetermined calibration points across the gauge faces, and
illuminating all segments of the odometer/trip odometer and gear selector indicator Vacuum-Fluorescent Display (VFD) units.
VACUUM-FLUORESCENT DISPLAYS
The Vacuum-Fluorescent Display (VFD) units are soldered to the CCN electronic circuit board. With the ignition switch in the Off or Accessory
positions, the odometer display is activated when the driver door is opened (Rental Car mode) and is deactivated when the driver door is closed.
Otherwise, both display units are active when the ignition switch is in the On or Start positions, and inactive when the ignition switch is in the Off or
Accessory positions.
The illumination intensity of the VFD units is controlled by the CCN circuitry based upon an input from the headlamp switch and a dimming level input
received from the panel dimmer switch. The CCN synchronizes the illumination intensity of other VFD units with that of the units in the CCN by sending
electronic dimming level messages to other electronic modules in the vehicle over the CAN data bus.
While in the odometer mode with the ignition switch in the On position and the engine not running, depressing the odometer/trip odometer switch for
about six seconds will display the engine hours information. Holding this switch depressed while turning the ignition switch from the Off position to the
On position will initiate the CCN self-diagnostic actuator test. See: Testing and Inspection for additional details on this cluster function. The CCN
microprocessor remembers which display mode is active when the ignition switch is turned to the Off position, and returns the VFD display to that mode
when the ignition switch is turned On again.
The VFD units are diagnosed using the CCN self-diagnostic actuator test See: Testing and Inspection. Proper testing of the CAN data bus and the
electronic data bus message inputs to the CCN that control some of the VFD functions requires the use of a diagnostic scan tool. Refer to the appropriate
diagnostic information.
CLUSTER ILLUMINATION
The CCN has a single electroluminescent lamp that provides cluster back lighting whenever the exterior lighting is turned On. The illumination intensity
of this lamp is adjusted when the interior lighting thumbwheel on the headlamp switch is rotated (down to dim, up to brighten). The CCN monitors a
resistor multiplexed input from the headlamp switch on a dimmer input circuit. In response to that input, the CCN will vary the PWM voltage from 5.6
rms to 13.5 volts rms.it receives on a hard wired panel lamps dimmer switch signal circuit into a 12-volt Pulse Width Modulated (PWM) output.
The CCN uses this PWM output to control the illumination intensity of the electroluminescent cluster illumination lamp and the VFD units on the CCN
circuit board, then provides a synchronized PWM output on various hard wired fused panel lamps dimmer switch signal circuits to control and
synchronize the illumination intensity of other incandescent illumination lamps in the vehicle. The CCN also transmits electronic dimming level
messages over the CAN data bus to other electronic modules in the vehicle to control and synchronize the illumination intensity of their VFD units to
that of the CCN VFD units.
In addition, the thumbwheel on the headlamp switch has a Parade Mode position to provide a parade or funeral mode. The CCN monitors the request for
this mode from the headlamp switch, then transmits an electronic dimming level message to illuminate all VFD units in the vehicle at full (daytime)
intensity for easier visibility when driving in daylight with the exterior lighting turned On.
Gauge Pack - Description
