tightened, but could also indicate another source of air leakage in the on-board evaporative and vapor recov-
ery emissions systems. Unless the leak is corrected, this message will latch and remain displayed during the
current and each subsequent ignition cycle until the trip odometer reset button is pressed and released
momentarily, which will revert the display to the odometer/trip odometer information that was last displayed for
the remainder of that ignition cycle. Once the source of a leak has been corrected, either momentarily pressing
the trip odometer reset button or cycling the ignition switch will unlatch the message and return the odometer/
trip odometer to normal operation.
•
Communication Error - If the cluster fails to receive a distance message during normal operation, it will hold
and display the last data received until the ignition switch is turned to the Off position. If the cluster does not
receive a distance message within one second after the ignition switch is turned to the On position, it will
display the last distance message stored in the cluster memory. If the cluster is unable to display distance
information due to an error internal to the cluster, the VFD will display “Error.”
•
Actuator Test - Each time the cluster is put through the actuator test, the odometer VFD will display all of its
segments simultaneously, then step through each character segment individually during the VFD portion of the
test to confirm the functionality of the VFD and the cluster control circuitry.
The PCM continually monitors the vehicle speed pulse information received from the vehicle speed sensor and
engine speed pulse information received from the crankshaft position sensor, then sends the proper distance and
engine speed messages to the instrument cluster. For further diagnosis of the odometer/trip odometer or the instru-
ment cluster circuitry that controls these functions, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAG-
NOSIS AND TESTING).
For proper diagnosis of the vehicle speed sensor, the crankshaft position sensor, the PCM, the CAN data bus, or
the electronic message inputs to the instrument cluster that control the odometer/trip odometer, a diagnostic scan
tool is required. Refer to the appropriate diagnostic information.
SEATBELT INDICATOR
DESCRIPTION
A seatbelt indicator is standard equipment on all
instrument clusters. This indicator is located near the
upper edge of the instrument cluster, between the
minor gauge set and the speedometer.
The seatbelt indicator consists of a stencil-like cutout of the International Control and Display Symbol icon for “Seat
Belt” in the opaque layer of the instrument cluster overlay. The dark outer layer of the overlay prevents the indicator
from being clearly visible when it is not illuminated. A red Light Emitting Diode (LED) behind the cutout in the
opaque layer of the overlay causes the icon to appear in red through the translucent outer layer of the overlay when
the indicator is illuminated from behind by the LED, which is soldered onto the instrument cluster electronic circuit
board. The seatbelt indicator is serviced as a unit with the instrument cluster.
OPERATION
The seatbelt indicator gives an indication to the vehicle operator of the status of the driver side front seatbelt. This
indicator is controlled by a transistor on the instrument cluster circuit board based upon cluster programming and a
hard wired input from the seatbelt switch in the driver side front seatbelt retractor through the seat belt indicator
driver circuit.
The seatbelt indicator also includes a programmable enhanced seatbelt reminder or “beltminder” feature that is
enabled when the vehicle is shipped from the factory. This beltminder feature can be disabled and enabled by the
customer using a specific programming event sequence, or by the dealer using a diagnostic scan tool.
The seatbelt indicator Light Emitting Diode (LED) is completely controlled by the instrument cluster logic circuit, and
that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the
fused ignition switch output (run-start) circuit. Therefore, the LED will always be off when the ignition switch is in any
position except On or Start. The LED only illuminates when it is provided a path to ground by the instrument cluster
transistor. The instrument cluster will turn on the seatbelt indicator for the following reasons:
•
Seatbelt Reminder Function - Each time the cluster receives a battery current input on the fused ignition
switch output (run-start) circuit, the indicator will be illuminated as a seatbelt reminder for about six seconds, or
HB
CLUSTER
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