Message Center - Service Information: Overview RAM Cab & Chassis 3500 HD

Scheme 119

The Electronic Vehicle Information Center (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 push buttons of an EVIC switch mounted on the left spoke of the steering wheel. The EVIC displays information related to the following

1. Audio Mode Display
2. Compass Display
3. Diesel Exhaust Fluid (DEF) - on 6.7 liter diesel engine models only.
4. Navigation System Displays - if the vehicle is so equipped.
5. Outside Temperature Display
6. Park Assist System - if the vehicle is so equipped.
7. Personal Settings - also known as customer programmable features.
8. System Status
9. Tire Pressure Monitor System - if the vehicle is so equipped.
10. Trip Computer Functions
11. U-Connect™ Hands-Free Communication System Displays - if the vehicle is so equipped.
12. Warning Message Displays

The EVIC system includes the following components

1. Ambient Temperature Sensor
2. Electronic Overhead Module
3. EVIC Switch
4. Instrument Cluster
5. Remote Compass Module

The EVIC display is part of the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) and is not serviced as a separate component. If the EVIC display is damaged or ineffective, the entire EMIC unit must be replaced.

OPERATION

The Electronic Vehicle Information Center (EVIC) uses both non-switched and ignition switched sources of battery current so that some of its features remain operational at any time, while others may only operate with the ignition switch in the ON position. When the ignition switch is turned to the ON position, the EVIC display will return to the last function being displayed before the ignition was turned to the OFF position.

The EVIC system consists of several different components that communicate over the Controller Area Network (CAN) and Local Interface Network (LIN) data buses. If the system is inoperative, a scan tool and the appropriate diagnostic information must be used to diagnose the system.

Scheme 120

The EVIC switch pod push buttons on the left spoke of the steering wheel are used to operate the available functions of the EVIC system. Pressing and releasing the MENU push button (6) allows the operator to select the Compass/Temperature, Trip Computer, Navigation (if equipped), Personal Settings (also known as customer programmable features) or System Status functions. The DOWN / SCROLL push button (4) is used to scroll through options or features of the Trip Computer, Personal Settings or System Status functions. Pressing and releasing the SELECT / RESET push button (3) enables the selection or resetting of the feature or function presently displayed in the EVIC. Pressing and releasing the COMPASS push button (5) will provide instant access to the compass/temperature display mode from any other mode.

In addition, if the vehicle is so equipped, the EVIC switch pod will include a VR (Voice Response) push button (1) to activate the optional Uconnect™ Voice Command system and a PHONE push button (2) to activate the Uconnect™ Phone system.

The ambient temperature sensor is a variable resistor that operates on a five-volt reference signal sent by the Totally Integrated Power Module (TIPM). The resistance in the sensor changes as temperature changes, changing the temperature sensor signal circuit voltage to the TIPM. Based upon the resistance in the sensor, the TIPM senses a specific voltage on the temperature sensor signal circuit. The TIPM then translates the voltage into a temperature reading that it sent over the Controller Area Network (CAN) data bus circuit to other modules utilizing temperature information.

The Electronic Vehicle Information Center (EVIC) control switch pod is a resistor multiplexed unit that receives source current from and provides hard wired inputs to the Local Interface Network (LIN) slave node integral to the speed control switch pod in the right spoke of the steering wheel spoke bezel. The LIN slave node communicates the switch states of the EVIC control switch pod, the remote radio switches and the horn switch over the LIN data bus to the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN), which is the LIN master node.

The EVIC control switch pod (also known as the odometer switch) for vehicles not equipped with the EVIC system contains two switch push buttons whose functions are

1. Reset - This switch button allows the operator to reset the trip odometer (A or B) currently displayed in the odometer display unit of the instrument cluster.
2. Step - This switch button allows the operator to step through the total odometer, trip odometer A and trip odometer B display options of the odometer display of the instrument cluster.

The EVIC control switch pod for vehicles equipped with the EVIC system contains four switch push buttons whose functions are

1. Back - Pressing and releasing the Back push button returns you to the previous sub menu or main menu.
2. Down Arrow - Pressing and releasing the Down Arrow push button allows the operator to scroll downward through the various EVIC main menus and sub menus.
3. Right Arrow - Pressing and releasing the Right Arrow (Select) push button allows the operator to navigate, select and reset items or settings in the currently displayed EVIC main menu or sub menu. Pressing and holding the Right Arrow (Select) push button for two seconds provides a global reset of all of those EVIC features that can be reset, whether currently displayed or not.
4. Up Arrow - Pressing and releasing the Up Arrow push button allows the operator to scroll upward through the various EVIC main menus and sub menus.

For vehicles equipped with the Uconnect™ Hands-Free Communication System, the EVIC control switch pod contains two additional switch push buttons whose functions are

1. VR (Voice Recognition) - This switch button activates the Uconnect™ Voice Command system.
2. Phone - This switch push button activates the Uconnect™ Hands-Free Phone system.

The EMIC LIN master node provides a clean ground and fused B(+) current for all of the switches and sensors on the rotating steering wheel through the LIN slave node circuitry of the speed control switch pod as well as for the Light Emitting Diode (LED) back lighting of both the speed control and the EVIC switch pods. The EMIC continually monitors the LIN bus data and will store a Signal Not Available (SNA) code for any LIN bus input errors. The EMIC also communicates with other electronic modules over the Controller Area Network (CAN) data bus. Therefore, any EMIC DTC information can be retrieved using a diagnostic scan tool connected to the Data Link Connector (DLC).

The analog resistor multiplexed circuits of the EVIC control switch pod as well as the hard wired circuits between the switch pod and the LIN slave node within 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 EMIC 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 EMIC 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.