Message Center - Service Information: Overview RAM Pickup 2500

Scheme 1

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 switches mounted on the steering wheel. The EVIC displays information related to the following

1. System Status
2. Vehicle information warning message displays
3. Tire Pressure Monitor System - If Equipped
4. Personal Settings (customer programmable features)
5. Diesel Exhaust Fluid (DEF) - 6.7L Diesel engine models only
6. Compass display
7. Park Assist System - If Equipped
8. Outside temperature display
9. Trip computer functions
10. U-Connect© hands-free communication system displays - If Equipped
11. Navigation system screens - If Equipped
12. Audio mode display

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

1. Instrument Cluster
2. Steering Wheel Switches
3. Ambient Temperature Sensor
4. Electronic Overhead Module
5. Remote Compass Module
6. Controller Area Network (CAN) Data Bus
7. Local Interface Network (LIN) Data Bus

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 . If the steering wheel switches are inoperative and require replacement, for the appropriate procedure, refer to SWITCH, Remote Radio , Removal . If the compass position sensor (Electronic Overhead Module) is inoperative and requires replacement, for the appropriate procedure, refer to MODULE, Compass , Removal .

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 is comprised 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 2

The steering wheel switches are used to operate the different functions of the EVIC system. Pressing and releasing the SELECT button (1) will change the mode displayed between Trip Functions, Navigation (If Equipped), System Status, Personal Settings, and Telephone (If Equipped). Pressing and releasing the BACK button (2) will return the system to the previous mode displayed.

Scheme 3

The SCROLL buttons (3) are used to scroll through Trip Functions, Navigation (If Equipped), System Status Messages, and Personal Settings (Customer Programmable Features). Pressing and releasing the SELECT button (1) accepts a selected choice.

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.