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Instrument Cluster - Description






DESCRIPTION





The instrument cluster (2) for this vehicle includes the hardware and software necessary to serve as the electronic body control module and is also referred to as the Cab Compartment Node (CCN) The instrument cluster is located directly in front of the driver above the steering column opening. The remainder of the CCN, including the mounts and the electrical connections, are concealed within the instrument.

Besides analog gauges and indicators, the CCN module incorporates two Liquid Crystal Display (LCD) units. One is a fixed segment unit for displaying odometer information, automatic transmission gear selector position (PRNDL), and the cruise indicator. The second is a large, reconfigurable visual display and interface for the Electronic Vehicle Information Center (EVIC), the trip computer, the Universal Garage Door Opener (UGDO), the customer programmable features, numerous textual warning or reminder indicators and certain diagnostic information.





The instrument cluster gauges and indicators (1) are visible through a dedicated opening in the instrument panel below the cluster hood and are protected by a clear plastic cluster lens and integral hood unit (2). The hood serves as a visor and shields the face of the gauges from ambient light and reflections to reduce glare. The molded plastic lens and hood has four integral latch features at various point around the perimeter that secure it to tabs molded into the outer perimeter of the cluster housing. The cluster bezel (3) is mounted to the cluster housing using similar design integral latches and screws located at the top and bottom of the assembly.

Several versions of the CCN module are offered on this vehicle. These versions accommodate all of the variations of optional equipment and regulatory requirements for the various markets in which the vehicle is offered. The microprocessor-based CCN utilizes integrated circuitry and information carried on the Controller Area Network (CAN) data bus and the Local Interface Network (LIN) 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 and LIN data busses. Communication - Description.

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:

- A/C Select and Evaporator Probe Support - The CCN monitors A/C select switch and evaporator temperature sensor hard-wired inputs from the Manual Temperature Control (MTC) control or electronic messages received over the CAN data bus from the Automatic Temperature Control (ATC) control, then transmits electronic A/C clutch request messages when appropriate to support the A/C clutch control feature.
- 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.
- Automatic Headlamps Support - On vehicles equipped with optional automatic headlamps, the CCN calculates the average ambient light level based upon an electronic message received over the CAN data bus from the Rain Sensor Module (RSM) on the windshield below the automatic day/night inside rear view mirror mounting button, then transmits an electronic auto headlamps request message when appropriate to support the automatic headlamps feature.
- Electric Backlight Status Support - On vehicles equipped with optional Automatic Temperature Control (ATC), the CCN monitors electronic Electric BackLight (EBL) status messages received over the CAN data bus from the ATC control, then transmits electronic EBL status messages when appropriate to support the EBL feature.
- Electronic Vehicle Information Center Support - The CCN provides support for each of the functions and features of the Electronic Vehicle Information Center (EVIC). This includes support for the compass, thermometer, audio system mode, customer programmable features, textual warnings, premium Tire Pressure Monitor (TPM), trip computer, U-Connect(TM) Hands-Free communication, HomeLink(TM) Universal Garage Door Opener (UGDO) and the steering wheel switch electronic message inputs received over the Local Interface Network (LIN) data bus that are used to control and configure many of the EVIC displays. This also includes display arbitrator programming, which controls the priorities, sequences, and transition of information that is displayed in the EVIC, particularly when multiple display requests are received simultaneously.
- Enhanced Accident Response Support - The CCN monitors an input from the Occupant Restraint Controller (ORC) and, following an airbag deployment, will immediately disable the power lock output, unlock all doors by activating the power unlock output, then enables the power lock output if the power lock switch input remains inactive for two seconds. The CCN also monitors an input from 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 ignition switch is turned to the OFF position, 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 Front Control Module (FCM) located on the Integrated Power Module (IPM) over the CAN data bus to support the exterior lighting functions.
- Fuel Level Data Support - The CCN provides a current source for and receives a hard-wired analog input from the fuel level sending unit located on the fuel pump module in the fuel tank. The CCN uses this input to calculate the proper fuel gauge needle position and to control low fuel indicator operation. Based upon this input, the CCN also uses electronic messaging to transmit this data over the CAN data bus for use by other electronic modules in the vehicle.
- Heated Seat Switch Support and Switch Indicator Control - On vehicles equipped with optional heated seats, the CCN monitors electronic heated seat switch status messages from the front heated seat switches in the instrument panel switch pod and hard-wired inputs from the rear heated seat switches and transmits electronic heated seat request messages over the CAN data bus. This message wakes up the Heated Seat Module (HSM) when the switch is actuated. The CCN then monitors electronic messages received over the CAN data bus from the HSM to send electronic status messages over the LIN data bus back to the lower switch pod to control front heated seat switch Light Emitting Diode (LED) indicators and uses a high side driver output to control the appropriate rear heated seat switch LED indicators.
- Hill Descent Switch Support and Switch Indicator Control - On vehicles equipped with the optional hill descent system, the CCN monitors electronic hill descent switch status messages from the hill descent switch in the instrument panel switch pod over the LIN data bus and transmits electronic hill descent switch request messages to the Controller Anti-lock Brake (CAB) over the CAN data bus. This message tells the CAB whether the system should be enabled or disabled when the switch is actuated. The CCN then monitors electronic messages received over the CAN data bus from the CAB and transmits electronic messages to the instrument panel switch pod over the LIN data bus to control the hill descent switch Light Emitting Diode (LED) disable indicator.
- Ignition On and Ignition Accessory/On Relay Control - The CCN monitors electronic ignition switch status messages received over the CAN bus from the Wireless Ignition Node (WIN) and a hard-wired input from the ignition switch on the instrument panel, and provides low side driver outputs to control both the ignition ON and ignition ACCESSORY/ON relays in the Junction Block (JB) as appropriate.
- 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 eight minutes.
- Interior Lighting Control - The CCN monitors electronic messages and hard-wired inputs from the interior lighting switch, the door ajar switches, the liftgate ajar switch, the liftgate flip-up glass ajar switch, the reading lamp switches and the WIN 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 pods, the steering wheel switches and the SCM, 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 LIN data bus that synchronizes the dimming level of all panel lamps dimmer controlled lamps with that of the cluster general illumination lighting.
- Park Assist Switch Support and Switch Indicator Control - On vehicles equipped with the optional park assist system, the CCN monitors electronic park assist switch status messages from the park assist switch in the instrument panel switch pod over the LIN data bus and transmits electronic park assist switch request messages to the park assist module over the CAN data bus. This message tells the park assist module whether the system should be enabled or disabled when the switch is actuated. The CCN then monitors electronic messages received over the CAN data bus from the park assist module and transmits electronic messages to the instrument panel switch pod over the LIN data bus to control the park assist switch Light Emitting Diode (LED) disable indicator.
- Power Inverter Support - The CCN monitors a hard-wired input from the power inverter to determine the inverter status, then transmits electronic inverter status messages to other electronic modules in the vehicle over the CAN data bus.
- Power Lock System Control - The CCN monitors inputs from the power lock switches and the WIN to provide control of the power lock motors through high side and low side driver outputs. This includes support for rolling door locks (also known as automatic door locks), automatic door unlock, and a door lock inhibit mode.
- Remote Keyless Entry Support - The CCN supports the Remote Keyless Entry (RKE) system features, including support for the RKE LOCK, UNLOCK (with optional driver-door-only unlock, and unlock-all-doors), PANIC, audible chirp, optical chirp, illuminated entry modes, an RKE programming mode, as well as optional Vehicle Theft Security System (VTSS) arming (when the proper VTSS arming conditions are met) and disarming.
- Remote Radio Switch Support - The CCN receives electronic message inputs from the remote radio switches on the steering wheel over the LIN data bus, then provides electronic radio request messages over the CAN data bus to support the remote radio switch function.
- Remote Start System Support - The CCN receives electronic message inputs from the WIN and then displays the appropriate remote start system textual reminder messages to the vehicle operator within the CCN dot matrix display.
- Steering Wheel Switch Support - The CCN receives electronic message inputs from the steering wheel switches on the steering wheel over the LIN data bus to control and configure many of the EVIC displays and functions.
- Vehicle Theft Security System Control - The CCN monitors inputs from the door ajar switches, and the WIN, on vehicles so equipped. The intrusion module then provides electronic horn and lighting request messages to the Front Control Module (FCM) located on the Integrated Power Module (IPM) for the appropriate VTSS alarm output features.
- 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 FCM located on the IPM over the CAN data bus to support the wiper and washer system functions, including the headlamps-on with wipers programmable feature.

VACUUM-FLUORESCENT DISPLAYS




Domestic Cluster



Bux Cluster
The instrument cluster includes the following Liquid Crystal Display (LCD) units:

- EVIC Display (21)
- Odometer/Trip Odometer Display (22)

The Liquid Crystal Display (LCD) (21)(22) units are soldered to the CCN electronic circuit board. Both the come standard the located below the speedometer are fixed segment displays. An odometer is standard factory-installed equipment on this vehicle. The odometer is located within the fixed segment, blue-green LCD. The fixed segment display unit is soldered onto the cluster electronic circuit board, and is visible through a window with a smoked lens. The dark lens prevents it from being clearly visible when it is not illuminated.

The odometer information is 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 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 shown in the fixed segment LCD in the same white color and at the same lighting level as the odometer values. The unit of measure for the odometer can be selected using the customer programmable features function of the Electronic Vehicle Information Center (EVIC). The odometer has a RENTAL CAR mode, which will illuminate the odometer information in the EVIC whenever either front door is opened with the ignition switch in the OFF or ACCESSORY positions.

During daylight hours (exterior lamps are OFF) the fixed segment LCD is illuminated at full brightness for clear visibility. At night (exterior lamps are ON), the LCD 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 LCD to be illuminated at full brightness if the exterior lamps are turned ON during daylight hours.

Dual trip odometer (Trip A and Trip B) capability is standard equipment on this vehicle. Both trip odometers appear within the LCD display unit, although they cannot be displayed simultaneously. The trip odometer information is stored in the instrument cluster memory. Each trip odometer can display values up to 16099.9 kilometers (9999.9 miles). Each trip odometer will roll over to zero independently when it accumulates these values. The trip odometer minimum value is 0.0 (miles or kilometers) and does have a decimal point to show tenths of a full unit values (miles or kilometers).

The unit of measure (km or miles) for the trip odometer display is shown next to the Trip A or Trip B text in the LCD in the same white color and at the same lighting level as the trip odometer values. The unit of measure for the trip odometer can be selected using the customer programmable features function of the Electronic Vehicle Information Center (EVIC).

The instrument cluster gauges, indicators, LCD units, as well as the cluster illumination are all integral components of the CCN and its electronic circuit board. If any part of the internal working components of the instrument cluster become damaged or inoperative, the entire instrument cluster assembly must be replaced. The cluster lens and hood unit are the only components of the instrument cluster assembly that can be serviced separately.

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