Chrysler RG Voyager. Manual — part 15
als Module (MSMAPM) is located under the driver’s
seat. It receives input from the following: driver’s
manual 8-way seat switch, driver’s seat position
sensors, PCI bus circuits, and the power mirror
sensors. The module uses these inputs to perform
the following functions: position the driver’s mem-
ory seat, both exterior mirrors (during recalls), both
pedals, and send/receive the memory system infor-
mation over the PCI bus.
The Memory Set Switch is wired to the Body
Control Module (BCM). A button (either #1 or #2)
pressed on the set switch causes the BCM to send a
message to the MSMAPM which in turn will send a
motion status message back to the BCM. If the
message from the MSMAPM indicates no current
motion, the BCM will send a recal message to the
module. The MSMAPM will set the seat, exterior
mirror, pedals, and radio to the presets for the
indicated driver.
If any one of the memory controlled systems is
inoperative from its manual switch, use the sche-
matics and diagnostic information to correct the
concern. This manual addresses the memory prob-
lems only and it is assumed there is not a basic
component failure.
3.14.1
POWER SEAT
The memory power seat provides the driver with
2 position settings for the driver’s seat. Each power
seat motor is connected to the MSMAPM with two
motor drive circuits. Each circuit is switched be-
tween battery and ground. By being able to bi-
directionally drive the circuits, the MSMAPM con-
trols the movement of the motors based on input
from the power seat switch or from the position
sensors when performing a memory recall. Each
motor contains a potentiometer to monitor the seat
position. To monitor the position of the motor, the
MSMAPM sends out a 5-volt reference on the sen-
sor supply circuit. The sensor is grounded back to
the module on a common ground circuit. Based on
the position of the sensor, the MSMAPM monitors
the voltage change through the sensor on a separate
signal circuit.
The MSMAPM stores the input value of each of
the four seat potentiometers in memory when the
system requests a set. The driver can initiate a
memory recall, using either the door mounted mem-
ory switch or the RKE transmitter (if the remote
linked to memory feature is enabled via the EVIC).
When initiated, the MSMAPM adjusts the four seat
sensors (by using the motors) to match the memo-
rized seat position data.
For safety, the memory seat recall is disabled by
the MSMAPM when the vehicle is out of park
position or if the speed is not zero. Any obstruction
to seat movement over a 2-second delay will cause
the seat to stop moving in which case a stalled
motor would be detected by the MSMAPM and the
corresponding seat output would be deactivated.
However, if the object obstructing the seat is re-
moved, the seat will function normally again.
3.14.2
MEMORY MIRROR
The driver sideview mirror contains vertical and
horizontal bi-directional drive positioning motors
and position sensors. The MSMAPM provides a
5-volt reference on the signal circuit to each position
sensor. The sensors share a common ground circuit.
The MSMAPM monitors the position of the mirror
motors by measuring the voltage on each signal
circuit. When a memory position is set, the MS-
MAPM monitors and stores the position of the
outside mirror. The MSMAPM adjusts the mirror to
the appropriate positions when a memory recall
message is received from the RKE or is requested
from the memory set switch.
The power mirror switch during non-memory
operation operates the mirror independently of the
MSMAPM.
3.15
OVERHEAD CONSOLE
COMPASS/TEMPERATURE MODULE,
COMPASS/MINI-TRIP COMPUTER or
ELECTRONIC VEHICLE INFORMATION CENTER
The
Compass/Temperature
Module
(CT),
Compass/Mini-Trip Computer (CMTC) or Elec-
tronic Vehicle Information Center (EVIC) is located
in the overhead console. The CT provides the vehi-
cle operator with only outdoor temperature and the
compass heading. The CMTC or EVIC supplements
the standard vehicle instrumentation. The CMTC
and EVIC use a vacuum fluorescent (VF) display to
supply the vehicle operator with a compass head-
ing, outdoor temperature, average fuel economy,
distance to empty, trip odometer, elapsed ignition
on time, distance to service, warning messages, and
service messages.
The difference between a CMTC and an EVIC is
that only the EVIC provides additional memory,
feature programming, and warning messages. The
EVIC is capable of displaying warning messages
and memory system messages when the vehicle is
equipped with memory systems. The EVIC also
provides the interface to enable and disable vehicle
programmable
features
when
the
vehicle
is
equipped with certain features.
If equipped, the EVIC is also available with an
integrated Universal Garage Door Opener (UGDO)
known as HomeLink
t. The EVIC may also be
equipped with up to 4 power door switches: ON/
OFF, Left Sliding Door, Right Sliding Door, and
Liftgate.
29
GENERAL INFORMATION
The CT function buttons are labeled C/T and
US/M. The CMTC function buttons are labeled
US/M, C/T, RESET, and STEP. The EVIC function
buttons are labeled C/T, RESET, STEP, and MENU.
The three UGDO buttons are labeled with dots to
indicate the channel number.
The BCM supplies most of the information dis-
played by the CMTC/EVIC. Display information,
except for the internal compass function, is received
over the PCI bus. The FCM supplies the ambient
temperature sensor information via the PCI bus.
The CMTC/EVIC sends and receives data over the
PCI bus, communicating with the BCM, PCM,
FCM, and the Instrument Cluster. Tire Pressure
Monitoring System information is received from the
SKREEM via PCI bus information. The tire pres-
sure sensors are mounted to the vehicle wheels. For
complete information, refer to the Tire Pressure
Monitoring System section in this publication.
3.15.1
VEHICLE INFORMATION DISPLAY
The CMTC/EVIC provides the following func-
tions:
•
Compass direction
•
Outside temperature
•
Elapsed ignition on time
•
Distance to empty
•
Average fuel economy
•
Trip odometer
•
Distance to service
The EVIC will also display the following driver
alert messages:
•
TURN SIGNAL ON (with vehicle graphic)
•
PERFORM SERVICE
•
DOOR OPEN (individual or multiple doors, with
graphic)
•
LOW TIRE PRESSURE (when equipped)
•
ADJUSTABLE PEDAL DISABLED CRUISE
ENGAGED (when equipped)
•
ADJUSTABLE PEDAL DISABLED VEHICLE
IN REVERSE (when equipped)
An audible chime or chimes will accompany any
displayed warning messages. Chime requests with
an OPEN message are dependent upon vehicle
speed.
The CT/CMTC/EVIC 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 CT/CMTC/EVIC.
The CMTC/EVIC receives the following messages
from the Body Control Module (BCM):
•
Verification of US/Metric status
•
VF display dimming brightness and exterior
lamp status
•
Elapsed Ignition On Time data
•
Average Fuel Economy
•
Distance to Empty
•
Distance to service
•
Driver warning messages
The CT/CMTC/EVIC receives the following mes-
sages from the Front Control Module (FCM):
•
Outside Temperature
The CMTC/EVIC receives the following messages
from the Powertrain Control Module (PCM):
•
Trip Odometer data
•
Vehicle Speed
The EVIC receives the following messages from
the Adjustable Pedal System Module (APS):
•
APS status warnings
The CT/CMTC/EVIC receives the following mes-
sages from the Sentry Key Remote Electronic Entry
Module (SKREEM):
•
Tire Pressure information
The CMTC/EVIC transmits the following mes-
sages to the BCM:
•
Status Request: Beep, Reset, US/M Toggle
•
Current Display
STEP BUTTON
The STEP Button can be used in one of the
following three ways:
1. To sequentially select one of seven displays or
blank display in the following order:
•
Average Fuel Economy
•
Distance to Empty
•
Trip Odometer
•
Time Elapsed
•
Distance to Service Message
•
Off (Blank)
2. To set the magnetic variance zone when VARI-
ANCE = X (X = 1 - 15) is indicated in the VF
Display.
3. To select the displayed programmable feature
setting. (When equipped.)
MENU BUTTON (EVIC only)
For complete information of the programmable
features and memory messages, refer to the RS/RG
Service Manual.
Use the MENU button to sequentially step the
EVIC through the programmable features.
30
GENERAL INFORMATION
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 (ex-
cept Distance to Service) and the CMTC/EVIC will
send a PCI bus beep request to the BCM. If the
RESET button is pressed again within 3 seconds,
the CMTC/EVIC will reset ALL of the trip functions
and an additional beep request is sent to the BCM.
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.
Pressing the RESET button for more than three (3)
seconds resets the Distance to Service function
while the Distance to Service message is being
displayed. The CMTC/EVIC module will send a
beep request to the BCM.
Simultaneously pressing the RESET button and
the STEP button while turning the ignition from
Off to On will enter the CMTC/EVIC into the
self-diagnostic mode.
COMPASS/TEMPERATURE (C/T) BUTTON
Actuating
the
Compass/Temperature
Button
(C/T) will cause the CMTC/EVIC to display the
compass and temperature information. This func-
tion will operate from another traveler display or
from the programmable feature mode.
3.15.2
TRAVELER DISPLAY FUNCTIONS
Using the STEP button will change the CMTC/
EVIC between modes of operation and display the
appropriate information according to data received
from the PCI Bus.
COMPASS/TEMPERATURE
The CMTC/EVIC simultaneously displays the
compass reading and the outside temperature. Out-
side temperature information is received via the
PCI bus from the FCM.
The CMTC/EVIC module internally senses and
calculates the compass direction.
COMPASS OPERATION - ALL
Upon ignition on, if the calibration information
stored in the CMTC memory is within the normal
range, the CMTC will perform in slow Auto-Cal
mode. In slow Auto-Cal mode, the CMTC continu-
ously compensates for the slowly changing mag-
netic field of the vehicle. The compass module
detects changes in the vehicle magnetism and
makes appropriate internal corrections to ensure
proper displayed direction.
However, if the calibration information stored in
the CMTC memory is not within the normal range
at ignition on, the CMTC will enter fast Auto-Cal.
CAL is displayed along with the temperature.
Auto activation of the fast Auto-Cal mode will
also occur when the CMTC is subjected to high
magnetic field strength levels, which cause all com-
pass readings to be erroneous for a continuous
period of five (5) minutes. During fast Auto-Cal,
CAL will be displayed along with the temperature.
Fast Auto-Cal can also be performed manually, by
pressing and holding the RESET button for 10
seconds during the Compass/Temperature display
mode.
3.15.3
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:
CMTC/EVIC:
•
The ignition switch must be in the On position
and the CMTC/EVIC display must not be blank.
•
If the compass/temperature data is not currently
being displayed, momentarily press and release
the C/T button to display compass/temp informa-
tion.
•
Press and hold the RESET button (approximately
5 seconds) until VARIANCE = XX is displayed.
The CMTC/EVIC will display the variance zone
stored in memory and the word VARIANCE.
•
Use the RESET button to select the proper vari-
ance zone number, 1 through 15.
•
After selecting the proper zone number, momen-
tarily press and release the RESET button. The
variance zone is then stored in the memory and
the CMTC/EVIC returns to normal operation.
CT:
•
The ignition switch must be in the On position
and the C/T display must not be blank.
•
Press and hold the C/T and US/M buttons (ap-
proximately 5 seconds) until VARIANCE = XX is
displayed. The C/T will display the variance zone
stored in memory and the word VARIANCE.
•
Use the US/M button to select the proper vari-
ance zone number, 1 through 15.
•
After selecting the proper zone number, momen-
tarily press and release the C/T button. The
31
GENERAL INFORMATION
variance zone is then stored in the memory and
the C/T returns to normal operation..
3.15.4
COMPASS CALIBRATION
The compass module has 2 types of auto-
calibration; slow-cal and fast-cal. Slow-cal ensures
that during normal vehicle operation the compass
performs auto-calibration functions to keep the
compass sensors in their proper operating range.
Whenever the ignition is On and the CT/CMTC/
EVIC receives PCI bus data indicating that engine
RPM is greater than zero, auto-calibration is per-
formed continuously.
If the calibration information stored in the com-
pass module memory is not within the normal
range after a power-up cycle, the compass will
display CAL. The CT/CMTC/EVIC will enter into
the fast-cal mode until calibration is complete.
To enter the compass into Manual Calibration
mode, perform the following steps:
•
Drive the vehicle to an area away from any large
metal objects or overhead power lines.
•
Ensure that the proper variance zone is selected.
See
9Setting Magnetic Zone Variance.9
•
The ignition switch must be in the On position
and the CMTC/EVIC display must not be blank.
•
Press the C/T button to view the Compass/
Temperature display.
•
Press and hold the RESET button (approximately
10 seconds) until CAL is displayed, then release
the button.
•
Drive slowly, less than 5 MPH (8KPH) in at least
1 complete 360-degree circle.
•
CAL will remain illuminated to alert the driver
that the compass is in the calibration mode.
•
After calibration is complete, CAL will turn off.
NOTE: For C/T Manual Calibration, perform
the same procedure as above, but press and
hold the C/T and US/M buttons until CAL is
displayed.
If the compass appears blank, unable to be cali-
brated, or the compass displays false indications,
the vehicle must be demagnetized. Refer to Com-
pass Demagnetizing Procedure in the Service Man-
ual.
3.15.5
SELF-CHECK DIAGNOSTICS
The CT/CMTC/EVIC is capable of performing a
diagnostic self check on its internal functions. Di-
agnostics may be performed using a DRBIII
t or by
using the following procedure:
1. For CMTC/EVIC: With the ignition switch in the
OFF position, depress and hold the RESET and
the STEP buttons.
For CT: With the ignition switch in the OFF
position, depress and hold the C/T and the US/M
buttons.
2. Turn the ignition switch to the ON position.
3. Continue to hold both buttons until the software
versions are displayed, then release the buttons.
4. All of the VFD segments will illuminate for 2-4
seconds. Check for segments that do not illumi-
nate or illuminate all the time.
5. When the self-check is complete the EVIC will
display one of the following messages:
•
PASS SELF TEST
•
FAILED SELF TEST
•
NOT RECEIVING J1850 MESSAGE
When the self-check is complete the CT/CMTC
will display one of the following messages:
•
PASS
•
FAIL
•
BUS
1. To exit the self-check mode:
For the CMTC/EVIC: Depress the STEP or RE-
SET button, or cycle the ignition switch and the
CMTC/EVIC will return to normal operation.
For the C/T: Depress the C/T or US/M button, or
cycle the ignition switch and the CT will return to
normal operation.
If a Communication fault is displayed, refer to the
symptom list. If a FAIL or FAILED is displayed, the
CT/CMTC/EVIC must be replaced.
3.15.6
AMBIENT TEMPERATURE SENSOR
The ambient air temperature is monitored by the
FCM and displayed by the CT/CMTC/EVIC. The
FCM receives a hardwire input from the ambient
temperature sensor (ATS).
The ATS is a variable resistor that operates on a
5-volt reference signal circuit hardwired from the
FCM. The resistance in the ATS changes as the
outside temperature rises or falls. The FCM senses
the change in reference voltage through the ATS
resistor. Based on the resistance of the ATS, the
FCM is programmed to correspond to a specific
32
GENERAL INFORMATION
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