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Home >> Chrysler >> 2012 >> 200 L4-2.4L >> Repair and Diagnosis >> Instrument Panel, Gauges and Warning Indicators >> Instrument Cluster / Carrier >> Description and Operation >> Instrument Cluster - Description

Instrument Cluster - Description






DESCRIPTION





The instrument cluster for this vehicle, located in the instrument panel directly in front of the driver, above the steering column opening. The instrument cluster includes the hardware and software necessary to serve as the electronic body control module and is also known as the Cab Compartment Node (CCN). The CCN, including the mounts and the electrical connections, are concealed within the instrument panel behind the cluster bezel. Besides analog gauges and indicators, the cluster incorporates two digital Vacuum Fluorescent Display (VFD) units for displaying odometer/trip odometer information, engine hours, automatic transmission gear selector position (PRNDL), several warning or reminder indications and certain diagnostic information, and the display for the Electronic Vehicle Information Center (EVIC).

Several versions of the CCN are offered. These versions accommodate all of the variations of optional equipment and regulatory requirements for the various markets in which the vehicle will be offered. The microprocessor-based CCN utilizes integrated circuitry and information carried on the Controller Area Network (CAN) data bus along with several hard wired analog and multiplexed inputs to monitor sensors and switches throughout the vehicle. In response to those inputs, the internal circuitry and programming of the CCN allow it to control and integrate many electronic functions and features of the vehicle through both hard wired outputs and the transmission of electronic message outputs to other electronic modules in the vehicle over the CAN/LIN data bus Communication - Description.

The CCN houses four analog gauges and has provisions for up to twenty-three indicators. All of the CCN indicators are automatically configured when the CCN is connected to the vehicle electrical system for compatibility with certain optional equipment or equipment required for regulatory purposes in certain markets. While each CCN may have provisions for indicators to support every available option, the configurable indicators will not be functional in a vehicle that does not have the equipment that an indicator supports.

Each indicator in the CCN, except those located within the VFD units, is illuminated by a dedicated LED that is soldered onto the CCN electronic circuit board. Cluster illumination is accomplished by dimmable LED back lighting, which illuminates each of the gauges for visibility when the exterior lighting is turned on. The LED units are not available for service replacement and, if damaged or faulty, the entire CCN must be replaced.

The CCN is serviced only as a complete unit. The CCN cannot be adjusted or repaired. If a gauge, an LED indicator, a VFD unit, the electronic circuit board, the circuit board hardware, the cluster overlay, or the CCN housing are damaged or faulty, the entire CCN must be replaced. The cluster lens, hood and mask unit are available for separate service replacement.

VEHICLE SYSTEMS SUPPORT

Besides typical instrument cluster gauge and indicator support, the electronic functions and features that the CCN supports or controls include the following:

- Audible Warnings - The CCN electronic circuit board is equipped with an audible tone transducer and programming that allows it to provide various audible alerts to the vehicle operator. These alerts include single chime tones and continuous slow or fast tones. An electromechanical relay is also soldered onto the circuit board to produce audible clicks that are used to emulate the sound of a conventional turn signal or hazard warning flasher.
- Compass/Temperature Display Support - The CCN provides support for each of the functions and features of the compass/temperature display, as well as for the odometer push button switch, which also provides user inputs to control the compass/temperature display options.
- Electronic Vehicle Information Center Display Support - The CCN provides support for each of the functions and features of the Electronic Vehicle Information Center (EVIC) display. This includes support for the compass, thermometer and audio system mode, customer programmable features, textual warnings, premium Tire Pressure Monitor (TPM), trip computer, U-Connect(TM) Hands-Free communication and the switch inputs from the two EVIC rocker switches located on the front surface of the steering wheel spokes that are used to control and configure many of the displays. This also includes display arbitrator programming, which controls the priorities, sequences, and transition of information that is displayed in the EVIC display, particularly when multiple display requests are received simultaneously.
- Enhanced Accident Response Support - The CCN monitors inputs from the Occupant Restraint Controller (ORC) and the Powertrain Control Module (PCM) to automatically turn ON the interior lighting after an airbag deployment event, 10 seconds after the vehicle speed is zero. The interior lighting remains illuminated until the key is removed from the ignition switch lock cylinder, at which time the interior lighting returns to normal operation and control. These Enhanced Accident Response System (EARS) features are each dependent upon a functional vehicle electrical system following the vehicle impact event.
- Exterior Lighting Switch Support - The CCN monitors electronic exterior lighting switch, and turn signal switch status messages from the Steering Control Module (SCM) on the steering column over the LIN data bus and transmits the appropriate electronic exterior lighting and turn signal request messages to the Totally Integrated Power Module (TIPM) over the CAN data bus to support the exterior lighting functions.
- Horn Switch Support - On vehicles without the optional EVIC, the CCN receives a hard wired input from the horn switch on the steering wheel. On vehicles with the optional EVIC, the CCN receives electronic horn switch status messages from the Steering Wheel Switch Module (SWSM) over the LIN bus. In either case, the CCN then provides electronic horn request messages over the CAN data bus to support the horn function.
- Interior Lamp Load Shedding - The CCN provides a battery saver feature which will automatically turn OFF all interior lamps if they remain ON after a timed interval of about ten minutes.
- Interior Lighting Control - The CCN monitors electronic messages and hard wired inputs from the reading lamp switches, the Sentry Key REmote Entry Module (SKREEM) (also known as the Wireless Control Module/WCM), the Steering Control Module (SCM) and the Totally Integrated Power Module (TIPM) to provide courtesy lamp control. This includes support for timed illuminated entry with theater-style fade-to-OFF and courtesy illumination DEFEAT features.
- Local Interface Network Master Module - The CCN is the master module for the LIN data bus. In this role it gathers information from the compass sensor, the Heated Seat Module (HSM), the instrument panel switch pod, the Steering Wheel Switch Module (SWSM), the SCM and the remote compass module, then either acts on that information directly or places electronic messages on the CAN data bus for use by other modules
- Panel Lamps Dimming Control - The CCN monitors electronic dimming level messages received from the panel lamps dimmer switch input to the SCM over the LIN data bus, then provides both a hard wired 12-volt Pulse-Width Modulated (PWM) output and electronic message outputs over the CAN data bus and the LIN data bus that synchronizes the dimming level of all panel lamps dimmer controlled lamps with that of the cluster general illumination lighting.
- Wiper and Washer Switch Support - The CCN monitors electronic wiper switch and washer switch status messages from the SCM on the steering column over the LIN data bus and transmits the appropriate electronic wiper and washer request messages to the TIPM over the CAN data bus to support the wiper and washer system functions, including the headlamps-on with wipers programmable feature.

VACUUM-FLUORESCENT DISPLAYS





The CCN includes the following VFD units:

- Gear Selector/Odometer/Trip Odometer (18 and 19)
- Electronic Vehicle Information Center (EVIC) Display (31)

The odometer and trip odometer are standard factory-installed equipment in all instrument clusters. The odometer and trip odometer are displayed in a common electronic, blue-green VFD unit. This VFD unit is soldered onto the cluster electronic circuit board, and is visible through a window with a smoked clear lens located on the lower edge of the tachometer in the lower right area of the cluster overlay. The dark lens over the VFD prevents the indicator from being clearly visible when it is not illuminated.

The odometer and trip odometer information are not displayed simultaneously. The trip odometer reset switch on the instrument cluster circuit board toggles the display between odometer and trip odometer modes by depressing the odometer/trip odometer switch button that extends through the lower edge of the cluster lens, just left of the minor gauge set. When the trip odometer information is displayed, the text TRIP A or TRIP B is also illuminated in the lower right corner of the odometer/trip odometer VFD in a blue-green color and at the same lighting level as the trip odometer information.

The odometer and trip odometer information are stored in the instrument cluster memory. This information can be increased when the proper inputs are provided to the instrument cluster, but the information cannot be decreased. The odometer can display values up to 999,999 kilometers (999,999 miles). The odometer latches at these values, and will not roll over to zero. The trip odometer can display values up to 999.9 kilometers (999.9 miles) before it rolls over to zero.

The odometer display does not show leading zeroes, does not have a decimal point and will not show values less than a full unit (kilometer or mile). The unit of measure (km or miles) for the odometer display is not shown in the VFD. The unit of measure for the instrument cluster odometer/trip odometer is selected at the time that it is manufactured, and cannot be changed. The odometer has a RENTAL CAR mode, which will illuminate the odometer information in the VFD whenever the driver side front door is opened with the ignition switch in the OFF or ACCESSORY positions.

During daylight hours (exterior lamps are OFF) the odometer VFD is illuminated at full brightness for clear visibility. At night (exterior lamps are ON), the VFD lighting level is adjusted with the other cluster general illumination lamps using the panel lamps dimmer function of the interior lighting control sleeve on the left multi-function switch control stalk. However, a PARADE mode position of the control sleeve allows the VFD to be illuminated at full brightness if the exterior lamps are turned ON during daylight hours. On vehicles manufactured for domestic markets, the odometer VFD is also illuminated at full brightness whenever the Malfunction Indicator Lamp (MIL) indicator is illuminated, and cannot be dimmed until the MIL indicator is extinguished.

The CCN module for this vehicle is serviced only as a complete unit. The CCN module cannot be adjusted or repaired. If a gauge, an LED unit, a VFD unit, the electronic circuit board, the circuit board hardware, the cluster overlay or the cluster housing are damaged or ineffective, the entire CCN module must be replaced. The cluster lens and the cluster hood and mask unit are available for separate service replacement.

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