RAM SRT-10 Pickup V10-505 8.3L (2004)
door ajar circuit. If the door is open and the DRBIII(R) displays the switch state as OPEN, it indicates an open door ajar circuit.
Compass Mini-Trip Computer (CMTC)
When equipped, the Compass/Mini Trip Computer (CMTC) is located in the overhead console. The CMTC supplements the standard vehicle
instrumentation. The CMTC uses a vacuum fluorescent (VF) display to supply the vehicle operator with a compass heading, outdoor temperature,
average fuel economy, distance to empty, trip odometer, and elapsed ignition on time. If equipped, the CMTC is also available with an integrated
Universal Garage Door Opener (UGDO) known as "HomeLink¨.
The CMTC function buttons are labeled C/T, RESET, STEP, and US/M. The three UGDO buttons are labeled with dots to indicate the channel number.
Most of the CMTC display information is received over the PCI bus. The CMTC sends and receives data over the PCI bus, communicating with the
FCM (Diesel), PCM (3.7L, 4.7L, 5.7L), and the Instrument Cluster.
VEHICLE INFORMATION DISPLAY
The CMTC provides the following functions:
-
Compass direction
-
Outside temperature
-
Elapsed ignition on time
-
Distance to empty
-
Average fuel economy
-
Trip Odometer
The CMTC will not display information for any of the screens for which it did not receive the proper PCI bus data. Refer to the symptom list in the
Overhead Console section for problems related to the CMTC.
The CMTC receives the following messages from the Instrument Cluster:
-
Verification of US/Metric status
-
VF display dimming brightness and exterior lamp status
-
Trip Odometer data
The CMTC receives the following message from the PCM:
-
Vehicle Speed
US/M BUTTON
The US/M button is used to toggle the display between English and Metric measurement units.
STEP BUTTON
The STEP Button can be used in one of the following ways:
1. To sequentially select one of 4 displays or blank display in the following order:
-
Average Fuel Economy
-
Distance to Empty
-
Trip Odometer
-
Time Elapsed . Off (Blank)
2. To set the magnetic variance zone when VARIANCE = X (X = 1 - 15) is indicated in the VF display.
RESET BUTTON
The RESET Button has two different functions:
1. To clear the trip functions that may be reset
2. To enter and exit the diagnostic mode
Pressing the RESET button once will clear the trip function that is currently being displayed and the CMTC will send a PCI bus beep request to the
Instrument Cluster. If the RESET button is pressed again within 3 seconds, the CMTC will reset ALL of the trip functions and an additional beep
request is sent to the Instrument Cluster. The trip functions that may be reset are:
-
Average Fuel Economy
-
Trip Odometer
-
Elapsed Time
A reset will only occur if one of the trip functions that may be reset is currently being displayed.
The CMTC module will send a beep request to the Instrument Cluster.
Simultaneously pressing the RESET button and the C/T button while turning the ignition from Off to On will enter the CMTC into the self-diagnostic
mode.
