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Home >> Jeep >> 2019 >> Renegade High Altitude, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster (Service Information) >> Description And Operation >> Description And Operation

Description And Operation

DESCRIPTION 

GC0169369Courtesy of CHRYSLER GROUP, LLC

The Instrument Panel Cluster (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 EVIC 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.

Just behind the cluster lens is the molded plastic cluster mask. The mask serves to separate and define the layout of the various visible areas of the IPC and also trims the cluster overlay. The mask lays over the cluster overlay, which is a laminated plastic unit. The dark, visible, outer surface of the overlay is marked with all of the gauge dial faces and graduations, but this layer is also translucent. The darkness of this outer layer prevents the cluster from appearing cluttered or busy by concealing the hard indicators that are not illuminated, while the translucence of this layer allows those hard indicators that are illuminated to be readily visible. The underlying layer of the overlay is opaque and allows light from the hard indicator LED units to be visible through the outer layer of the overlay through predetermined stencil-like cutouts. The defined areas of the IPC are:

GC0169326Courtesy of CHRYSLER GROUP, LLC

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 microcontroller-based IPC utilizes integrated circuitry and information carried on the Controller Area Network (CAN) data bus 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 IPC is mounted behind the steering wheel, is connected to the CAN and includes four gauges:

At the center is a large display (available in two different versions and is reconfigurable) EVIC. In the various information positions are located numerous warning lights, described in the service information of the functions to which they relate.

The IPC receives and manages the messages coming from the compass module and the humidity sensor (if present) via the LIN data bus.

The 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 with the oil temperature gauge, the gauge will not read in the EVIC until the vehicle reaches normal operating temperature.

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.

Within the IPC is placed a chime with the ability to manage reports of different intensity, in order to fulfill the many functions (described in the diagrams of the functions to which they relate).

The IPC is a module of the CAN through which it exchanges information with the Body Control Module (BCM) and other electronic control units, in detail:

The IPC indicator circuit is able to detect any anomaly in the wiring or the sensor and provide an appropriate indication to the IPC:

The IPC gauges, indicators, LED units, control switches as well as the EVIC 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.

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.

The Body Control Module (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 hard wired circuits between components related to the IPC 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 IPC or the electronic controls or communication between modules and other devices that provide some features of the IPC. The most reliable, efficient and accurate means to diagnose the IPC or the electronic controls and communication related to IPC operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

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