Sebring LXI Sedan V6-2.7L VIN R (2002)
Trip Computer: Description and Operation
The JR Compass Mini-Trip Computer (CMTC) is located in the instrument panel between the center A/C outlets. The CMTC has two function buttons
and a vacuum fluorescent (VF) display that provides the outside temperature, Trip Computer information, and one of eight compass headings to indicate
the direction the vehicle is facing. The compass heading and the outside temperature are displayed at the same time.
The BCM calculates much of the information displayed by the CMTC. The BCM receives this information from PCI Bus messages, the PCM, and the
Ambient Temperature Sensor. The Ambient Temperature Sensor (ATS) monitors the outside temperature and is hardwired to the PCM. The CMTC
receives filtered outside temperature data via PCI Bus messages from the BCM. The ambient temperature sensor may receive invalid data whenever the
vehicle is operated at low speeds, or the ignition is off for a short period of time. These causes for inaccuracy will be filtered out by the BCM.
The CMTC receives dedicated PCI Bus messages with the calculated information from the BCM for the trip computer displays.
The CMTC cannot be repaired and, if faulty or damaged it must be replaced. The incandescent lamp for the STEP and US/M button illumination is
serviceable.
Actuation of the STEP button will cause the CMTC to change modes of operation. Actuation of the USN button will toggle the display between English
and Metric units. Trip Computer resets are accomplished by pressing the STEP and US/M buttons simultaneously. To reset only the trip information
currently being displayed,press and release the STEP and US/M buttons simultaneously for one second until the chime sounds. To reset all trip
information, press and hold the STEP and US/M buttons simultaneously until a second chime sounds (approximately 2 seconds) and then release the
buttons.
The CMTC operates only when the ignition is on. The following functions are available using the STEP button:
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Compass and outside temperature
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Average fuel economy (AVE ECO)
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Instantaneous Fuel Economy (ECO)
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Distance to Empty (DTE)
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Trip Odometer (ODO)
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Elapsed ignition time (ET)
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Display Off
C0MPASS/MINI-TRIP C0MPUTER VF DISPLAY MESSAGES
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
Diagnostic for problems related to the CMTC.
The CMTC receives the following messages from Body Control Module (BCM):
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Verification of US/Metric status
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VF display dimming brightness and exterior lamp status
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Trip Odometer data
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Elapsed Ignition On Time data
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Fuel Economy (Average and Instantaneous)
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Distance to Empty
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Outside Temperature
The CMTC transmits the following messages to the BCM:
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Status Request: Beep, Reset, US/M Toggle
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Current Display
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Compass Heading
The CMTC receives the following message from PCM:
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Vehicle Speed
SETTING MAGNETIC ZONE VARIANCE
Variance is the difference between magnetic North and geographic North. For proper compass function, the correct variance zone must be set. Refer to
the Zone Variance map for the correct zone. Follow these steps to check or change the variance zone:
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The ignition switch must be in the On position and the CMTC display must not be blank.
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Press and hold the STEP and US/M buttons until VAR is displayed. The CMTC will display the last variance zone stored in memory and the word
VAR.
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Use the STEP button to select the proper variance zone number, 1through 15.
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After selecting the proper zone number, simultaneously Press the STEP and US/M buttons wait approximately 15 seconds. The variance zone is
then stored in the memory and the CMTC returns to normal operation.
COMPASS CALIBRATION
