Chrysler Concorde 1993 Service Manual page 254

8C - 2 OVERHEAD CONSOLE
• Average fuel economy
• Distance to empty
• Instantaneous fuel economy
• Trip odometer
• Elapsed time
THERE ARE 4 BUTTONS
The buttons operate when the ignition is in the ON
position (Fig. 4).
Fig. 4 OTIS
• STEP
• C/T
• US/M
• RESET
STEP BUTTON
Pressing the STEP button selects one of the follow-
ing 5 displays:
• Average fuel economy
• Distance to empty
• Instantaneous fuel economy
• Trip odometer
• Elapsed time
C/T (COMPASS/TEMPERATURE) BUTTON
Pressing the C/T button selects the Compass/Tem-
perature display.
US/M (ENGLISH/METRIC MEASUREMENT)
BUTTON
Pressing the US/M button switches the display
units between English and Metric readings.
RESET BUTTON
Pressing the RESET button resets the function on
the display, provided that function can be reset. The
functions which can be reset are Average fuel econ-
omy, Trip odometer and Elapsed time.
The RESET button is also used to set the variance
and/or calibrate the compass. Refer to the Variance
Procedure and Calibration Procedure.
SELF-DIAGNOSTIC TEST
(1) With the ignition switch in the OFF position si-
multaneously press the C/T and STEP buttons and
turn the ignition switch ON.
(2) OTIS will illuminate all segments on the VFD
for 2-4 seconds. Release the C/T and STEP buttons.
Check for segments that are not illuminated.
(3) If OTIS displays PASS, the module is OK.
(4) If OTIS displays FAIL, replace the module.
(5) If OTIS displays CCD, check for an open or
short in the bus communication wires.
(6) Press the C/T or STEP button to exit self-test.
DISPLAY DIAGNOSTICS
TEMPERATURE
OTIS receives Chrysler Collision Detection (CCD
bus) messages from the body controller for all dis-
played information except the compass display. If a
dash (-) is displayed, OTIS is not receiving a CCD
message from the body controller. To check out the
CCD lines and the body controller use the DRB II
and Body Diagnostic Procedure manual.
If OTIS displays SC instead of a temperature, the
CCD message is more than 55°C (131°F). Check for a
short circuit between the temperature sensor and the
body controller.
If OTIS displays OC instead of a temperature, the
CCD message is less than -40°C (-40°F). Check for an
open circuit between the temperature sensor and the
body controller.
AVERAGE FUEL ECONOMY
OTIS receives average fuel economy information
from the body controller over the CCD lines. If OTIS
displays -.- instead of an average fuel economy value,
it is not receiving a CCD message for the average
fuel economy from the body controller. To check out
the CCD lines and the body controller use the DRB
II.
DISTANCE TO EMPTY
OTIS receives distance to empty information from
the body controller over the CCD lines. If OTIS dis-
plays a dash ( - ) instead of a distance to empty
value, it is not receiving a CCD message for the dis-
tance to empty from the body controller. To check out
the CCD lines and the body controller use the DRB
II.
INSTANTANEOUS FUEL ECONOMY
OTIS receives instantaneous fuel economy informa-
tion from the body controller over the CCD lines. If
OTIS displays a dash (-) instead of an instantaneous
fuel economy value, it is not receiving a CCD mes-
sage for the instantaneous fuel economy from the
body controller. To check out the CCD lines and the
body controller use the DRB II.
TRIP ODOMETER
OTIS receives trip odometer information from the
body controller over the CCD lines. If OTIS displays