Overhead Console - Service Information: Overview Dodge Dakota III рестайлинг

Scheme 35

Note. The Compass Mini-Trip Computer (CMTC) is sometimes referred to as the Electronic Overhead Modules (EOM) for the purposes of scan tool and diagnostic information naming. Please treat the CMTC and EOM as one and the same when diagnosing the vehicle.

Note. The overhead console reading lamp switches, bulb holders and wiring harness are serviced only as a unit and are not available individually for service.

An overhead console (1) is available on this vehicle and includes the following components

1. Front map/reading lamps (2)
2. A vacuum-fluorescent display screen (4) - if equipped with CMTC
3. HomeLink® transceiver (3) - if equipped
4. CMTC Module - if equipped
5. Power Sunroof Switch - if equipped

The overhead console assembly is mounted by two snap clips and a screw securing it to a molded plastic retainer bracket located above the headliner. The CMTC module is accessed by removing the overhead console from the bracket and pulling it away from the headliner. The CMTC module consist of the vacuum-fluorescent display screen, HomeLink® transceiver and four function buttons. The individual components of the CMTC module are not serviced separately and if damaged or inoperative, must be replaced as a unit.

For additional information on the CMTC module and system. See Electrical - Message Systems/Overhead Console/MODULE, Compass and Mini-Trip Computer - Description .

Scheme 36

Scheme 37

1. Disconnect and isolate the battery negative cable.
2. Remove the overhead console retaining screw (2), located in the front of console near the windshield.
3. Using your fingertips, grasp the sides of the overhead console (1) and pull straight down evenly to disengage the two snap clips at the rear of the unit.
4. Lower the overhead console from the headliner far enough to access the wire harness connectors.
5. Disconnect the reading lamp wire harness connector (2).
6. If equipped, disconnect the sunroof switch wire harness connector (1).
7. If equipped, disconnect the Compass Mini-Trip Computer (CMTC) module wire harness connector (3).
8. Remove the overhead console from the vehicle.

Scheme 38

1. Position the overhead console near the mounting location on the headliner.
2. Connect the reading lamp wire harness connector (2).
3. If equipped, connect the sunroof switch wire harness connector (1).
4. If equipped, connect the Compass Mini-Trip Computer (CMTC) module wire harness connector (3).
5. Align the snap clips on the overhead console housing with their receptacles (3) in the overhead console bracket.
6. Push upward firmly and evenly on the sides of the overhead console housing over the snap clip locations until the snap clips are fully engaged with the receptacles in the overhead console bracket.
7. Install the overhead console retaining screw (2), located in the front of console (1) near the windshield.
8. Reconnect the battery negative cable.

Scheme 39

Note. The Compass Mini-Trip Computer (CMTC) module is sometimes referred to as Electronic Overhead Module (EOM) for the purposes of scan tool and diagnostic information naming. Please treat the CMTC and EOM as one and the same when diagnosing the vehicle.

The Compass Mini-Trip Computer (CMTC) is located in the overhead console and consists of the following components

1. HomeLink® transceiver (3) - if equipped
2. Vacuum-Fluorescent Display (VFD) (6)
3. Push button function switches (1, 2, 3, 4 and 5)
4. Replaceable light bulbs to illuminate the push button function switches

The CMTC contains a central processing unit and interfaces with other electronic modules in the vehicle on the Controller Area Network (CAN) data bus. The CAN data bus 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 individual components of the CMTC module are not serviced separately and if damaged or inoperative, must be replaced as a unit.

The CMTC provides several electronic functions and features. Some of the functions and features that the CMTC supports and/or controls, include the following display options

1. Compass and Temperature - provides the outside temperature and one of eight compass readings to indicate the direction the vehicle is facing.
2. Trip Odometer (ODO) - shows the distance travelled since the last trip computer reset up to 6000 miles.
3. Average Fuel Economy (AVG ECO) - shows the average fuel economy since the last reset. Average fuel economy is a running average of the amount of fuel used and the distance the vehicle has traveled. When the fuel economy is reset, the display will momentarily blank. Then, the display will show the same value as before the rest. The reset value is based on a minimal amount of fuel used and the distance traveled from the previous drive cycle. The display may take several miles for this value to change dependent upon driving habits.
4. Distance To Empty (DTE) - shows the estimated distance that can be traveled with the fuel remaining in the tank. This estimated distance is determined by weighted average of the instantaneous and average fuel economy, according to the current fuel tank level. This is not resettable. Significant changes in driving style or vehicle loading will greatly affect the actual drivable distance of the vehicle, regardless of the DTE displayed value. When the DTE value is less than 30 miles estimated driving distance, the DTE display will change to an alternating test display of "LO" and "FUEL". This display will continue until the vehicle runs out of fuel. Adding a significant amount of fuel to the vehicle will turn off the "LO FUEL" text and a new DTE value will be displayed, based on the current values in the DTE calculation and the current fuel tank level.
5. Elapsed time (ET) - shows the accumulated ignition-on time since the last trip computer reset.
6. Blank screen - the compass mini-trip computer VFD is turned off or in Blank Screen Mode.

OPERATION

The Compass Mini-Trip Computer (CMTC) only operates with the ignition switch in the On position and the Ignition Off Draw (IOD) fuse functioning and in place. When the ignition switch is turned to the On position, all of the segments in the CMTC Vacuum-Fluorescent Display (VFD) will be turned off for one second, then the display will return to the last function being displayed before the ignition was turned to the Off position. With the ignition switch in the On position, momentarily depressing and releasing the STEP push button (4) will cause the CMTC to change its mode of operation. Momentarily depressing and releasing the U.S./M push button (1) will cause the unit to toggle between U.S. and Metric measurements. Momentarily depressing and releasing the C/T (compass/temperature) push button (5) will cause the CMTC to return to the compass/temperature display mode from any other mode.

Pressing the RESET push button (2) for more than one second with the ignition switch in the On position will reset the following CMTC functions

1. Average Fuel Economy (AVG ECO)
2. Trip Odometer (ODO)
3. Elapsed Time (ET)

However, the reset will only occur if the function currently displayed is a function that can be reset. If the RESET push button is pressed twice within two seconds while in any of the three resettable functions (AVG ECO, ODO, ET), all three of these functions will be reset.

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