Compass Calibration Procedure; Compass Display Diagnostics; Demagnetizing Procedure - Chrysler Concorde 1993 Service Manual

dashes -.- instead of the trip odometer value, it is not
receiving a CCD message for the trip odometer from
the body controller. To check out the CCD lines and
the body controller use the DRB II.
ELAPSED TIME
OTIS receives a bus message containing elapsed
time information. If OTIS displays dashes -:-- instead
of the elapsed time, it is not receiving a CCD mes-
sage for the elapsed time from the body controller. To
check out the CCD lines and the body controller use
the DRB II.
SELF DIAGNOSTIC TEST
(1) With the ignition switch in the OFF position si-
multaneously press the C/T and STEP buttons.
(2) Turn ignition switch ON
(3) OTIS lights all segments on the VFD for 2-4
seconds. Check for segments that are not illumi-
nated.
(4) OTIS displays PASS, the module is ok.
(5) OTIS displays FAIL, replace the module.
(6) OTIS displays CCD, check for an open or a
short in the bus communication wires.
(7) Press the C/T or the STEP button to exit self-
test.

COMPASS DISPLAY DIAGNOSTICS

To display the vehicle direction, OTIS processes in-
formation from a sensor internal to the module. OTIS
is self-calibrating and requires no adjusting. OTIS
displays the label CAL whenever the compass is in
the fast calibration mode.
If all three of the following conditions listed below
occur, the vehicle must be demagnetized.
• Compass portion of the display is blank
• Temperature portion of the display is OK
• The label CAL is illuminated
If demagnetizing the vehicle is needed refer to the
demagnetizing procedure. After demagnetizing, to
calibrate the compass refer to Calibration Procedure
and to set the variance refer to Variance Procedure.
If the compass portion of the display is still blank,
replace OTIS.

DEMAGNETIZING PROCEDURE

Do not attach magnetic devices, such as magnetic
CB antennas to the vehicle roof, as they can cause
the compass to give false readings.
Every vehicle has its own magnetic field. This
magnetic field is created by the various processes a
steel roof goes through when the vehicle is built. A
magnetic field can also be created if the roof is sub-
jected to a magnet, example magnetic C.B. antenna,
magnetic tipped screwdriver, etc. If the roof becomes
magnetized use a demagnetizing Tool 6029 to demag-
netize the roof.
OVERHEAD CONSOLE
In this demagnetizing procedure you will use the
demagnetizing tool to demagnetize the roof. It is im-
portant that you follow the instructions below ex-
actly.
(1) Be sure the ignition switch is in the OFF posi-
tion before you begin the demagnetizing procedure.
(2) Place an 8 1/2 in. X 11 in. piece of paper
lengthwise on the roof of vehicle directly above com-
pass. The purpose of the paper is to protect the roof
panel from scratches and define the area to be de-
magnetized.
(3) Plug in the demagnetizing tool, keeping it at
least two feet away from the OTIS.
(4) Slowly approach the center of the roof panel at
the windshield with the demagnetizing tool plugged
in.
• Contact the roof panel with the tip of the tool.
• Using slow sweeping motions of 1/2 inch between
sweeps
• Move the tool about four inches either side of the
centerline, and at least 11 inches back from the
windshield.
(5) With the demagnetizing tool still energized,
slowly back away from the roof panel until the tip is
at least two feet from the roof before unplugging the
tool.
(6) Recalibrate compass and set variance.

COMPASS CALIBRATION PROCEDURE

Do not attempt to set the compass calibration near
large metal objects such as other vehicles, large
buildings or bridges. Remove all magnetic devices
from roof panel. This compass is equipped with an
auto-calibration feature which eliminates the need to
manually set compass calibration. For a short time
when the vehicle is new, the compass may appear er-
ratic and the CAL symbol will be lit. After complet-
ing 3 complete 360 degree turns, in an area free of
metal objects and on level ground, the CAL symbol
will turn off and the compass will perform normally.
If at any time the compass should become inaccu-
rate it can be put in auto-calibration mode by using
the following procedure.
(1) Turn key to the ON position.
(2) Press C/T button to select the Compass/Temper-
ature display.
(3) Press and hold RESET button, for about 5 sec-
onds the VAR symbol will light. While continuing to
hold the RESET button, for about 10 seconds the
CAL symbol will light.
(4) Drive the vehicle through 3 complete 360 de-
gree turns, in an area free of metal objects and in no
less than 48 seconds, the compass will be calibrated.
(5) The OTIS will extinguish the CAL label.
(6) Reset compass variance.
The calibration procedure automatically sets the
variance to 8. If you are in an area with a variance
number other than 8 you must reset the variance.
8C - 3