Overhead Console: Overview Dodge Pickup R2500

DESCRIPTION

Two different overhead consoles are available on DR models. The Electronic Vehicle Information Center (EVIC) (Scheme 8) or Compass Mini-Trip Computer (CMTC). All consoles are equipped with two reading/ courtesy lamps. The overhead console is mounted with screws and two snap clips to a molded plastic retainer bracket located above the headliner.

Scheme 8

OPERATION

Refer to the vehicle Owner's Manual for specific operation of each overhead console and its systems.

If the problem with the overhead console is an inaccurate or scrambled display, refer to SELF-DIAGNOSTIC TEST . If the problem with the overhead console is incorrect Vacuum Fluorescent Display (VFD) dimming levels, use a DRB III(R) scan tool and BODY DIAGNOSTIC PROCEDURES to test for the correct dimming message inputs being received from the Body Control Module (BCM) or Front Control Module (FCM) over the J1850 Programmable Communications Interface (PCI) data bus circuit. If the problem is a no-display condition, use the following procedure. For complete circuit diagrams, refer to SYSTEM WIRING DIAGRAMS - R1500 , SYSTEM WIRING DIAGRAMS - R2500 or SYSTEM WIRING DIAGRAMS - R3500 .

1. Remove the overhead console from the headliner. Refer to «REMOVAL»(ref-189666-S25609909672005091200000) .
2. Check for battery voltage at the overhead console electrical connector. Refer to «SYSTEM WIRING DIAGRAMS - R1500»(ref-154276) , «SYSTEM WIRING DIAGRAMS - R2500»(ref-154277) or «SYSTEM WIRING DIAGRAMS - R3500»(ref-154278) for connector information. If OK, go to Step 3. If not OK, check for battery voltage at the appropriate B(+) fuse in the integrated power module. Repair the open fused B(+) circuit as required.
3. Turn the ignition switch to the On position. Check the fused ignition switch output circuit(s) at the overhead console electrical connector. If OK, go to Step 4. If not OK, repair the open or shorted circuit as required.
4. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Check for continuity between the ground circuit cavity of the overhead console electrical connector and a good ground. There should be continuity. If OK, refer to «SELF-DIAGNOSTIC TEST»(ref-189666-S17298026682005091200000) for further diagnosis of the electronics module and the J1850 PCI data bus circuit. If not OK, repair the open ground circuit as required.

The Compass Mini-Trip Computer (CMTC) is a module located in the overhead console. The CMTC is equipped with a mini-trip feature. The CMTC consists of a electronic control module with a Vacuum Fluorescent Display (VFD) and function switches. The CMTC consists of a electronic module that displays compass, trip computer, and temperature features. Actuating the STEP push button will cause the CMTC to change mode of operation when the ignition is ON. Example

1. Average miles per gallon (ECO)
2. Distance to empty (DTE)
3. Trip odometer (ODO)
4. Elapsed time (ET)
5. Off

Actuating the C/T push button will cause the CMTC to change to Compass/Temperature display.

The Compass Mini-Trip Computer module in the overhead console has buttons used to select various functions. The CMTC selector buttons will not operate until the ignition is in the RUN position.

When the ignition switch is first turned to the RUN position, the CMTC display returns to the last mode setting selected before the ignition was last switched OFF.

The Electronic Vehicle Information Center (EVIC) is a module located in the overhead console on some models. The EVIC module features a large Vacuum Fluorescent Display (VFD) screen for displaying information, and back-lit push button switches labeled C/T (compass/temperature), RESET, STEP, and MENU.

The EVIC module contains a central processing unit, and interfaces with other electronic modules in the vehicle over the Programmable Communications Interface (PCI) J1850 data bus circuit. The PCI data bus circuit allows the sharing of sensor information. This helps to reduce wire harness complexity, reduce internal controller hardware, and reduce component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics, and allows the addition of many new feature capabilities.

The EVIC "Menu" push button provides the vehicle operator with a user interface, which allows the selection of several optional customer programmable electronic features to suit individual preferences.

Refer to STANDARD PROCEDURE - ELECTRONIC VEHICLE INFORMATION CENTER PROGRAMMING for more information on the customer programmable feature options.

If the vehicle is equipped with the optional universal transmitter transceiver, the EVIC will also display messages and an icon indicating when the universal transmitter transceiver is being trained, which of the three transmitter buttons is transmitting, and when the transceiver is cleared.

Data input for all EVIC functions, including VFD dimming level, is received through the J1850 PCI data bus circuit. The EVIC module uses its internal programming and all of its data inputs to calculate and display the requested data. If the data displayed is incorrect, perform the self-diagnostic tests as described in this group. If these tests prove inconclusive, the use of a DRB III(R) scan tool and BODY DIAGNOSTIC PROCEDURES are recommended for further testing of the EVIC module and the J1850 PCI data bus circuit.

The EVIC module cannot be repaired, and is available for service only as a unit. If any part is faulty or damaged, the complete EVIC module must be replaced.

The Electronic Vehicle Information Center is wired to both constant 12v 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 module display will return to the last function being displayed before the ignition was turned to the Off position.

The compass/temperature display is the normal EVIC display. With the ignition switch in the On position, momentarily depressing and releasing the C/T (compass/temperature) push button switch will cause the EVIC to return to the compass/temperature display mode from any other mode. While in the compass/temperature display mode, momentarily depressing and releasing the Step push button will step through the available trip computer display options.

The EVIC trip computer features several functions that can be reset. The functions that can be reset are: average fuel economy, trip odometer and elapsed time. With the ignition switch in the On position and with one of the functions of the trip computer that can be reset currently displayed, depressing the Reset push button twice within three seconds will perform a global reset, and all of the trip computer information that can be reset will be reset to zero. With the ignition switch in the On position and the function that is to be reset currently displayed, momentarily depressing and releasing the Reset push button once will perform a local reset, and only the value of the displayed function will be reset to zero. A global or local reset will only occur if the function currently displayed is a function that can be reset. The distance to service function can also be reset using the local reset method, but it will reset back to the Service Interval distance that is set in the EVIC programmable features mode. Refer to STANDARD PROCEDURE - ELECTRONIC VEHICLE INFORMATION CENTER PROGRAMMING for more information on setting the Service Interval.

For more information on the features, control functions and setting procedures for the EVIC module, see the owner's manual in the vehicle glove box.

Ambient air temperature is monitored by the overhead console. The ambient temperature messages are received from the Front Control Module (FCM) over the Programmable Communications Interface (PCI) J1850 data bus circuit. The FCM receives a hard wired input from the ambient temperature sensor see scheme 9 The ambient temperature sensor is a variable resistor mounted to the underside of the hood, in the engine compartment.

Scheme 9

For more information on the front control module, refer to ELECTRONIC CONTROL MODULES . For complete circuit diagrams, refer to SYSTEM WIRING DIAGRAMS - R1500 , SYSTEM WIRING DIAGRAMS - R2500 or SYSTEM WIRING DIAGRAMS - R3500 . The ambient temperature sensor cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

The ambient temperature sensor is a variable resistor that operates on a five-volt reference signal sent to it by the Front Control Module. The resistance in the sensor changes as temperature changes, changing the temperature sensor signal circuit voltage to the Front Control Module. Based upon the resistance in the sensor, the Front Control Module senses a specific voltage on the temperature sensor signal circuit, which it is programmed to correspond to a specific temperature. The Front Control Module then sends the proper ambient temperature messages to the EVIC, CMTC over the PCI J1850 data bus.

The temperature function is supported by the ambient temperature sensor, a wiring circuit, the Front Control Module, the Programmable Communications Interface (PCI) data bus, and a portion of the Electronics module. If any portion of the ambient temperature sensor circuit fails, the Front Control Module will self-diagnose the circuit.

For complete circuit diagrams, refer to SYSTEM WIRING DIAGRAMS - R1500 , SYSTEM WIRING DIAGRAMS - R2500 or SYSTEM WIRING DIAGRAMS - R3500 .

Some DR models are equipped with a universal transmitter transceiver. The universal transmitter is integral to the Electronic Vehicle Information Center (EVIC) and the Compass Mini-Trip Computer (CMTC), which is located in the overhead console. The only visible component of the universal transmitter are the three transmitter push buttons centered between the module's push buttons located just rearward of the display screen in the overhead console. The three universal transmitter push buttons are identified with one, two or three light indicators so that they be easily identified.

Each of the three universal transmitter push buttons control an independent radio transmitter channel. Each of these three channels can be trained to transmit a different radio frequency signal for the remote operation of garage door openers, motorized gate openers, home or office lighting, security systems or just about any other device that can be equipped with a radio receiver in the 286 to 399 MegaHertz (MHz) frequency range for remote operation. The universal transmitter is capable of operating systems using either rolling code or non-rolling code technology.

The electronics module displays messages and a small house-shaped icon with one, two or three dots corresponding to the three transmitter buttons to indicate the status of the universal transmitter. The EVIC messages are

1. Clearing Channels - Indicates that all of the transmitter codes stored in the universal transmitter have been successfully cleared.
2. Channel "X" Training - Indicates that the universal transmitter is in its transmitter learning mode.
3. Channel "X" Trained - Indicates that the universal transmitter has successfully acquired a new transmitter code.
4. Channel "X" Transmitting - Indicates that a trained universal transmitter button has been depressed and that the universal transmitter is transmitting.

The universal transmitter cannot be repaired, and is available for service only as a unit with the EVIC or CMTC module. If any part of the universal transmitter is faulty or damaged, the complete EVIC or CMTC module must be replaced.

The universal transmitter operates on a non-switched source of battery current so the unit will remain functional, regardless of the ignition switch position. For more information on the features, programming procedures and operation of the universal transmitter, see the owner's manual in the vehicle glove box.