Displays Test
Certain instrument panel cluster (IPC) features are tested when the ignition
is turned on in order to verify the features are working properly. The following indicators
illuminate briefly at key up unless otherwise noted:
| • | Antilock Brake System (ABS) |
| • | Air bag (flashes 7 times) |
Indicators and Warning Messages
Refer to
Indicator/Warning Message Description and Operation
.
Engine Coolant Temperature Gage
The instrument panel cluster (IPC) displays the engine coolant temperature as
determined by the powertrain control module (PCM). The IPC receives a GMLAN message
from the PCM indicating the engine coolant temperature. The engine coolant temperature
gage defaults to 38°C (100°F) if:
| • | The PCM detects a malfunction in the engine coolant temperature sensor
circuit. |
| • | The IPC detects a loss of GMLAN communications with the BCM. |
Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by
the powertrain control module (PCM). The IPC receives a GMLAN message from the body
control module (BCM) indicating the fuel level volume. The fuel gage defaults to E
(empty) if:
| • | The PCM detects a malfunction in the fuel level sensor circuit. |
| • | The IPC detects a loss of GMLAN communications with the BCM. |
When the fuel level is less than 14 percent, the low fuel indicator illuminates.
Odometer
The vehicles is calculated and stored electronically in the body control module
(BCM). The BCM calculates and stores the mileage based on the vehicle speed message
delivered from the powertrain control module (PCM). The instrument panel cluster (IPC)
displays the season odometer information sent from the BCM over GMLAN. The odometer
will display 'error' if an internal IPC memory failure is detected or if there is
a GMLAN communication fault between the PCM and the BCM.
The driver information center (DIC) in radio displays the TRIP Odometer A or
TRIP Odometer B information sent from the BCM over GMLAN. Press the INFO button until
TRIP A or TRIP B is displayed. This shows the current distance traveled since the
last reset for each trip odometer in either miles or kilometers. Both odometers can
be used at the same time. Each trip odometer can be reset to zero separately by pressing
and holding the ENTER button for a few seconds while the desired trip odometer is
displayed. The TRIP A or TRIP B Odometer will display "- - -.- -" if there
is a GMLAN communication fault between the PCM and BCM.
PRNDL Display
The instrument panel cluster (IPC) displays the selected gear position as determined
by the powertrain control module (PCM). The IPC receives a GMLAN message from the
body control module (BCM) indicating the gear position. The PRNDL display blanks if:
| • | The PCM detects a malfunction in the transmission range switch circuit. |
| • | The IPC detects a loss of GMLAN communications with the BCM. |
Speedometer
The instrument panel cluster (IPC) displays the vehicle speed based on the information
from the vehicle speed sensor. The IPC receives a GMLAN message from the body control
module (BCM) indicating the vehicle speed. The IPC calculates the vehicle speed based
on the GMLAN message indicating the wheel reference speed from the BCM if:
| • | The powertrain control module (PCM) detects a malfunction in the vehicle
speed sensor circuit. |
| • | The IPC detects a loss of GMLAN communications with the BCM. |
The speedometer defaults to 0 km/h (0 mph) if the IPC detects
a loss of GMLAN communications with the BCM.
Tachometer
The instrument panel cluster (IPC) displays the engine speed as determined by
the powertrain control module (PCM). The IPC receives a GMLAN message from the body
control module (BCM) indicating the engine speed. The tachometer will default to 0 RPM
if:
| • | The PCM detects a malfunction in the engine speed sensor circuit. |
| • | The IPC detects a loss of GMLAN communications with the BCM. |
