Description

DESCRIPTION





The instrument cluster (2) for this vehicle is an ElectroMechanical Instrument Cluster (EMIC) that is located in the instrument panel above the steering column opening, directly in front of the driver. The remainder of the EMIC, including the mounts and the electrical connections, are concealed within the instrument panel below the cluster hood (1). The instrument cluster also includes the hardware and software necessary to serve several other functions and is sometimes referred to as the Cab Compartment Node/CCN or KOMBI.

Besides analog gauges and indicators, the EMIC module incorporates either a standard single multi-function indicator Liquid Crystal Display (LCD) unit or optional dual multi-function indicator Organic Light Emitting Diode (OLED) display units. These multi-function indicators display odometer/trip odometer information, an electronic digital clock, automatic transmission gear selector position (PRNDL) and outside ambient temperature, numerous warning indicators and certain diagnostic information. When the vehicle is so equipped, the multi-function indicator can also serve as the display for the Active Service SYStem (ASSYST) engine oil maintenance indicator, which displays engine oil level or maintenance reminders, and serves as the visual display and interface for the trip computer, the customer programmable features and numerous textual warnings.

The standard cluster multi-function indicator has four push button switches on the face of the cluster, which provide the vehicle operator with an interface to adjust certain variables and to select from multiple display options. The optional cluster multi-function indicator has four push button switches on the face of the cluster as well as switches mounted on each side of the driver airbag trim cover in the center of the steering wheel, which provide the vehicle operator with an interface to adjust certain variables, to select from multiple display options and to select from numerous programmable features.

The EMIC gauges and indicators are visible through a dedicated opening in the instrument panel below the cluster hood and are protected by a clear plastic cluster lens with an integral black plastic surround that is secured by integral latches to the molded black plastic cluster hood. Two black plastic multi-function indicator switch push buttons protrude through dedicated holes in each outboard edge of the surround. The cluster housing has an integral hood that serves as a visor and shields the face of the cluster from ambient light and reflections to reduce glare.

The EMIC electronic circuitry is protected by the molded plastic cluster housing. The cluster housing serves as the carrier for the cluster electronic circuit board and circuitry, the cluster connector receptacle, the gauges, a Light Emitting Diode (LED) for each cluster indicator and general illumination lamp, the multi-function indicator LCD or OLED display units, electronic tone generators, the cluster overlay, the gauge pointers, the multi-function indicator switches and the four switch push buttons. An integral latching mechanism located at each rear outboard end of the cluster are used to secure the EMIC to the molded plastic instrument panel base unit. The housing includes a clearance hole for the single cluster connector receptacle on the cluster electronic circuit board. The connector receptacle on the back of the cluster electronic circuit board connect the EMIC to the vehicle electrical system through a dedicated take out with connector from the vehicle wire harness.

The cluster overlay 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 cluster indicators that are not illuminated, while the translucence of this layer allows those indicators and icons that are illuminated to be readily visible. The underlying layer of the overlay is opaque and allows light from the LED for each of the various indicators and illumination lamps behind it to be visible through the outer layer of the overlay only through predetermined cutouts. Rectangular openings in the overlay between the speedometer and tachometer provide windows through which the illuminated multi-function indicator units can be viewed.

Several versions of the EMIC 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 EMIC utilizes integrated circuitry, Electrically Erasable Programmable Read Only Memory (EEPROM) type memory storage, 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 hardware and software of the EMIC 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 data bus.

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

- Active Service System - In vehicles equipped with the Active Service SYSTem (ASSYST) engine oil maintenance indicator option, the EMIC electronic circuit board includes a second dedicated microprocessor. This second microprocessor evaluates various data including time, mileage, and driving conditions to calculate the required engine oil service intervals, and provides both visual and audible alerts to the vehicle operator when certain maintenance services are required.
- Audible Warnings - The EMIC electronic circuit board is equipped with an audible tone generator and programming that allows it to provide various audible alerts to the vehicle operator, including buzzing and chime 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.
- Panel Lamps Dimming Control - The EMIC provides electronic dimming level messages to the Roof Control Module (RCM) (also known as the DBE control unit) that synchronizes the dimming level of all panel lamps dimmer controlled lamps with that of the cluster general illumination lamps and the multi-function indicators, except when the headlamp switch is in the AUTOposition with the optional Automatic Driving Lights.




Standard (Without Steering Wheel Switches)




Optional (With Steering Wheel Switches)

The EMIC houses up to three analog gauges and has provisions for up to 28 indicators. Some of the EMIC indicators are automatically configured when the EMIC is connected to the vehicle electrical system for compatibility with certain optional equipment or equipment required for regulatory purposes in certain markets. Other indicators may require the EMIC be configured (parameterized or programmed) for compatibility with optional or required equipment using a diagnostic scan tool. While each EMIC 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.

The EMIC includes the following analog gauges:

- Fuel Gauge (25) - with optional EMIC (with steering wheel switches) only. An electronic segmented bar graph fuel gauge in the multi-function display (28) is used with the standard EMIC (without steering wheel switches).
- Speedometer (1)
- Tachometer (22)

The EMIC includes one of the following multi-function display units:

- Liquid Crystal Display (28) - single Liquid Crystal Display (LCD) with standard EMIC (without steering wheel switches).
- Organic Light Emitting Diode Display (28) - dual Organic Light Emitting Diode (OLED) displays with optional EMIC (with steering wheel buttons).

The EMIC includes the following multi-function display push button switches:

- Plus (+) and Minus (-) Buttons (23)
- Zero (Reset) Button (32)
- Menu (M) Button (33) - with standard EMIC (without steering wheel switches) only. A steering wheel menu button is used with the optional EMIC (with steering wheel switches).
- Engine Oil Level Button (34) - with optional EMIC (with steering wheel switches) only. Engine oil level is displayed by selecting an item on a menu found using the M (Menu) button with the standard EMIC (without steering wheel switches).

The EMIC includes provisions for the following indicators:

- Airbag (SRS) Indicator (29)
- Air Filter Indicator (18) - with diesel engine only and with standard EMIC (without steering wheel switches) only. An icon and textual message in the multi-function display (28) is used with the optional EMIC (with steering wheel switches).
- Ajar Indicators (15) - with standard EMIC (without steering wheel switches) only. An icon and textual message in the multi-function display (28) is used with the optional EMIC (with steering wheel switches).
- Antilock Brake System (ABS) Indicator (8)
- Brake Indicator (30)
- Brake Wear Indicator (16) - with standard EMIC (without steering wheel switches) only. An icon and textual message in the multi-function display (28) is used with the optional EMIC (with steering wheel switches).
- Charging Indicator (14) - with standard EMIC (without steering wheel switches) only. An icon and textual message in the multi-function display (28) is used with the optional EMIC (with steering wheel switches).
- Constant Engine Speed (ADR) Indicator (24) - with standard EMIC (without steering wheel switches) only. A textual message in the multi-function display (28) is used with the optional EMIC (with steering wheel switches).
- Coolant Low Indicator (6) - with standard EMIC (without steering wheel switches) only. An icon and textual message in the multi-function display (28) is used with the optional EMIC (with steering wheel switches).
- Electronic Stability Program (ESP) Indicator (12)
- Engine Coolant Temperature Indicator (5) - with standard EMIC (without steering wheel switches) only. An icon and textual message in the multi-function display (28) is used with the optional EMIC (with steering wheel switches).
- High Beam Indicator (27)
- Lamp Out Indicator (17) - with standard EMIC (without steering wheel switches) only. An icon and textual message in the multi-function display (28) is used with the optional EMIC (with steering wheel switches).
- Low Beam Indicator (21)
- Low Fuel Indicator (26)
- Malfunction Indicator Lamp (MIL) (2)
- Park Brake Indicator (20)
- Seatbelt Indicator (19)
- Tire Pressure Monitor (TPM) Indicator (9) - may also include textual messages in the multi-function display (28).
- Traction Control (ASR) Indicator (10) - with standard EMIC (without steering wheel switches) only. An icon and textual message in the multi-function display (28) is used with the optional EMIC (with steering wheel switches).
- Traction Control (ASR) Malfunction Indicator (4)
- Turn Signal (Right and Left) Indicators (7)
- Washer Fluid Indicator (11) - with standard EMIC (without steering wheel switches) only. An icon and textual message in the multi-function display (28) is used with the optional EMIC (with steering wheel switches).
- Wait-To-Start Indicator (3) - with diesel engine only.
- Water-In-Fuel Indicator (13) - with standard EMIC (without steering wheel switches) only. An icon and textual message in the multi-function display (28) is used with the optional EMIC (with steering wheel switches).

Each indicator in the EMIC, except those located within a multi-function indicator display unit, is illuminated by a dedicated LED that is soldered onto the EMIC electronic circuit board. Cluster illumination is accomplished by dimmable LED back lighting, which illuminates the gauges for visibility when the exterior lighting is turned ON. These LED units are not available for service replacement and, if damaged or ineffective, the entire EMIC must be replaced.

Hard wired circuitry connects the EMIC to the electrical system of the vehicle. These hard wired circuits are integral to the vehicle wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system and to the EMIC through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

The EMIC module for this vehicle is serviced only as a complete unit. The EMIC module cannot be adjusted or repaired. If a gauge, an LED unit, a multi-function indicator display unit, the electronic circuit board, the circuit board hardware, an electronic tone generator, the cluster overlay or the cluster housing is damaged or ineffective, the entire EMIC module must be replaced. The cluster lens is available for separate service replacement.