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Home >> Jeep >> 2021 >> Compass Trailhawk >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Electronic Control Modules (Service Information) >> Module, Instrument Panel Cluster (IPC) >> Description And Operation

Description And Operation

DESCRIPTION 

GC0179362Courtesy of CHRYSLER GROUP, LLC
  1. Instrument Panel Cluster (IPC) 

The IPC for this vehicle is located in the instrument panel above the steering column opening. The IPC gauges and indicators are visible through an opening in the cluster bezel and are protected by a clear plastic cluster lens that is secured to the cluster housing by integral latch formations.

The molded plastic cluster housing encloses and protects the perimeter of the IPC unit. The cluster housing serves as the carrier for the instrument cluster circuitry, the gauge set, the indicators, an electronic display unit, the brightness sensor (used to control when dimming can take place when auto headlamp mode is selected) as well as an audible tone transducer. Each of the cluster hard indicators as well as the general cluster illumination is provided by dedicated Light Emitting Diode (LED) units soldered to the cluster electronic circuit board. A molded plastic rear cover includes clearance holes for the connector receptacle and is secured to the cluster housing by screws. The connector receptacle on the back of the IPC electronic circuit board connects the unit to the electrical system of the vehicle through a dedicated take out and connector of the instrument panel wire harness.

Several versions of the IPC 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 IPC utilizes integrated circuitry and information carried on the Controller Area Network (CAN) data buses (CAN-C and CAN-IHS) along with several hard wired inputs to monitor other sensors and switches in the vehicle. In response to those inputs, the internal circuitry and programming of the IPC allow it to monitor many electronic functions and features of the vehicle.

The Body Control Module (BCM) directly controls the door closing red flashing LED, located in the instrument panel.

For the versions in which the "SERVICE" menu is present, a dedicated menu for resetting the SERVICE will be available in the IPC module diagnosis. The "SERVICE" resetting procedure must be carried out via diagnosis equipment.

For versions in which the pre-delivery mileage RESET function is present, when the vehicle is new or with less than 200 km (124 miles) the display shows the letter "H" before mileage. As long as mileage is below 200 km (124 miles) and the "H" is displayed this can be reset, since it is considered as pre-delivery movement. Resetting of pre-delivery mileage is carried out through diagnosis equipment in the IPC module diagnosis.

GC0162662Courtesy of CHRYSLER GROUP, LLC

Electronic Vehicle Information Center (EVIC) 

The EVIC features a driver-interactive display. The display is located in the middle of the instrument cluster between the speedometer and tachometer. This system conveniently allows the driver to select a variety of useful information by pressing the switches mounted on the steering wheel. The EVIC displays information related to the following:

The EVIC system is comprised of several different components. Those components are:

The EVIC display is part of the Instrument Cluster assembly and is not serviced as a separate component. If the display is inoperative, the complete Instrument Cluster assembly must be replaced. Refer to REMOVAL AND INSTALLATION . If the EVIC function buttons are inoperative and require replacement, for the appropriate procedure. Refer to SWITCH, EVIC CONTROL, REMOVAL AND INSTALLATION .

Electronic Vehicle Information Center (Left) Control Switch Pod 

GC0162341Courtesy of CHRYSLER GROUP, LLC

The Electronic Vehicle Information Center (EVIC) control switch pod is located in the left spoke of the steering wheel spoke bezel. This switch has up to eight push buttons. Five of the push buttons are used on all vehicles equipped with the EVIC. Three additional push buttons are found on vehicles equipped with the optional Uconnect™ Hands-Free Communication System. The only visible components of the switch pod are the switch push buttons and a decorative bezel around the push buttons, which stands slightly proud of the steering wheel spoke bezel. The remainder of the switch pod including its mounting provisions and its electrical connection are concealed beneath the spoke bezel.

The switch pod housing and push buttons are constructed of molded plastic. Each of the push buttons has white International Control and Display Symbol graphics or text applied to it, which clearly identify the function of each push button. The switch pod is secured through three integral mounting tabs to mounting bosses on the back of the spoke bezel by three screws. A connector receptacle integral to the inboard end of the switch pod housing connects the EVIC control switch pod to the vehicle electrical system through a dedicated take out and connector of the steering wheel wire harness.

Refer to the Owner Manual for specific Electronic Vehicle Information Center Control Switch Pod button functions.

The EVIC control switch pod cannot be adjusted or repaired. If any function of the switch is ineffective or damaged, the entire switch pod unit must be replaced.

OPERATION 

The IPC has the hardware and software to simultaneously monitor multiple inputs. The microcontroller-based IPC uses these inputs to control the gauges and indicators visible on the face of the cluster, and to display the appropriate information in the electronic display unit to allow the vehicle operator to monitor the conditions of many of the vehicle components and operating systems. The IPC display provides valuable information about the various standard and optional powertrains, fuel and emissions systems, cooling systems, lighting systems, safety systems and many other convenience items. The IPC 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.

Some of the IPC inputs are hard wired, but most are in the form of electronic messages that are transmitted by other electronic modules over the CAN data bus. The IPC microcontroller 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 provide an extreme output and the microcontroller 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 IPC may also produce audible warnings for other electronic modules in the vehicle based upon electronic tone request  messages received over the CAN data bus. Each audible warning is intended to provide the vehicle operator with an audible alert to supplement a visual indication.

Instrument Panel Cluster 

Inputs: 

Outputs: 

The BCM stores and compares vehicle configuration data with the IPC as well as with other Electronic Control Units (ECU) in the vehicle. This process is referred to as Programming Of Configuration of Systems Integrated (PROCSI) (also known as PROXI). If a configuration mismatch is detected, the BCM sets a DTC. A configuration mismatch DTC will require the performance of a Restore BCM PROXI Configuration routine, or a PROXI Configuration Alignment routine using a diagnostic scan tool.

The IPC circuitry operates on battery current received through a fused B(+) fuse on a non-switched fused B(+) circuit. This arrangement allows the IPC to remain functional regardless of the status of the ignition switch. The IPC circuitry is grounded through a ground circuit and take out of the instrument panel wire harness with an eyelet terminal connector that is secured by a ground screw to a ground location on the instrument panel structural support.

The IPC gauges, indicators, LED units, control switches as well as the electronic display unit are all integral components of the IPC and its electronic circuit board. If any part of the IPC is damaged or ineffective, the entire IPC assembly must be replaced.

Electronic Vehicle Information Center 

The EVIC function buttons are used to operate the different functions of the EVIC system. Pressing and releasing the Arrow  buttons allows the driver to scroll though and select the Compass/Temperature, Trip Computer, Personal Settings or System Status functions. The OK  button allows the selection of setting or resetting of the function currently displayed at that time.

Electronic Vehicle Information Center (Left) Control Switch Pod 

The EVIC control switch pod is a LIN unit that receives source current from and provides hard wired inputs to the LIN slave node circuitry of the IPC LIN module. The EVIC LIN slave node circuitry communicates the switch states of the EVIC control switch pod, the remote radio switches, and the heated steering wheel sensor (if equipped) over the LIN data bus to the LIN master node integral to the IPC through the Steering Column Control Module (SCCM) mounted housing located on the top of the steering column.

The analog resistor multiplexed circuits of the EVIC control switch pod as well as the hard wired circuits between the switch pod and the speed control switch pod may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the LIN slave or master nodes, the SCM or the electronic controls and communication between modules and other devices that provide some features of the EVIC system. The most reliable, efficient, and accurate means to diagnose the EVIC control switch pod, the LIN slave or master nodes, the SCM or the electronic controls and communication related to EVIC system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

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