Air Bag Warning Indicator
The inflatable restraint Sensing and Diagnostic Module (SDM) controls
the air bag indicator over the class 2 serial data line. The SDM will
turn the indicator ON for approximately 3 seconds during the engine
start up in order to perform a bulb check. The SDM will turn the indicator
ON in order to warn the driver of a supplemental inflatable restraint (SIR)
electrical system malfunction, possibly affecting the operation of the SIR
system. Refer to
SIR System Operation
in SIR.
ANTI-LOCK Indicator
The Electronic Brake Control Module (EBCM) controls the ANTI-LOCK warning
indicator over the class 2 serial data line. The EBCM turns the indicator
ON for approximately 3 seconds during the engine start up in order
to perform a bulb check. The EBCM flashes the ANTI-LOCK warning indicator
in order to warn the driver that an ABS malfunction exists, possibly degrading
the base brake performance. A solid (not flashing) ANTI-LOCK warning indicator
warns the driver that a problem has been detected that affects the operation
of the ABS (ABS may be disabled), but normal brake performance will remain.
Refer to
ABS Description
in Antilock Brake System.
Automatic Transaxle Control Position Indicator
The Powertrain Control Module (PCM), via the Park/Neutral Position (PNP)
switch, performs the following functions:
| • | Reads the transmission gear position. |
| • | Sends the transmission gear position information to the instrument
cluster via Class 2 serial data line. |
The instrument cluster displays the gear position.
Brake Warning Indicator
The brake warning indicator lights under the following conditions:
| • | When the master cylinder senses a low brake fluid level |
| • | When the parking brake switch is closed |
| • | When certain ABS Diagnostic Trouble Codes (DTC's) are set by the
EBCM. |
The brake warning indicator warns the driver that a base brake problem
may exist.
CHANGE OIL SOON Indicator
The Powertrain Control Module (PCM) determines the amount of oil life
from various sensors and inputs within the engine control system. The PCM
performs the following functions:
| • | Calculates the oil life. |
| • | Sends the calculation to the instrument cluster via the class 2
serial data line. |
When the PCM determines that an oil life of 0% is present, the PCM informs
the driver by turning on the CHANGE OIL SOON indicator. After an oil change,
the light may be reset by performing the following procedures:
| • | Turn the ignition switch to the RUN position (engine OFF). |
| • | Fully depress and release the accelerator pedal 3 times
within 5 seconds. |
The CHANGE OIL SOON indicator flashes 2 times indicating the
system is reset. If the light comes on and stays on for 5 seconds, the system
did not reset. The system will need to be reset again.
If the vehicle is equipped using an up-level cluster including a Driver
Information Display (DID), the system may be reset by pressing the DID RESET
button for approximately 5 seconds while viewing the oil life display
on the DIC.
Charge Warning Indicator
The Powertrain Control Module (PCM) controls the charge warning indicator
via the class 2 serial data line. The instrument cluster turns ON the
charge indicator under the following conditions:
| • | When the PCM detects an under voltage (11.2 V) or over
voltage (16.5 V) |
Dimming Control
The display dimming for the instrument cluster shall follow the radio
dimming characteristics. Upon the activation of the park lamp, the display
shall step dim to maximum brightness in the dim mode. The display may go blank
upon the lowest dimming request of the interior lights dimming control switch
in the headlamp switch.
Coolant TEMP Indicator
The coolant temperature data is calculated within the Powertrain Control
Module (PCM). The PCM controls the coolant TEMP indicator via the class 2
serial data line. The instrument cluster turns on the coolant TEMP indicator
when the PCM determines that the engine coolant temperature has reached a
value of approximately 124° C (255°F).
CRUISE Indicator
The Powertrain Control Module (PCM) sends a signal via the class 2
serial data line whenever the cruise control is activated. Refer to
Cruise Control System Operation
in
Cruise Control.
Engine Coolant Temperature Gauge
The Power Control Module (PCM) broadcasts the coolant temperature value
via the class 2 serial data line. The instrument cluster compares the
temperature data using a 16 point look-up table in order to determine
the needle deflection. A smooth filter is used in order to secure a continuous
response. The instrument cluster drives the temperature gauge to C (cold)
under the following conditions:
| • | The temperature data is lost. |
| • | The PCM is in a state of health fault. |
Fasten Belts Indicator
The seat belt data is received from the Body Control Module (BCM) via
the class 2 serial data line. The BCM sends a signal in order to turn
on the seat belt warning indicator when the following 2 conditions
occur:
| • | The BCM detects that the ignition switch is in the RUN position. |
| • | The seat belt has not been latched. |
Refer to
Body Control System Operation
in Body Control System.
Fuel Gauge
The Powertrain Control Module (PCM) broadcasts the fuel level data via
the class 2 serial data line. The instrument cluster compares the fuel
data using a 16 point look-up table in order to determine the needle
deflection. A smooth filter is used in order to secure a continuous response.
The instrument cluster may determine if a low fuel condition is present. In
the event of a low fuel condition, the following conditions may occur:
| • | The instrument cluster shall activate the LOW FUEL indicator. |
| • | Send a chime message to the Body Control Module (BCM). |
The instrument cluster may drive the fuel gauge to E (empty)
under the following conditions:
| • | The fuel level data is lost. |
| • | The PCM is in a state of health fault. |
High Beam Indicator
The high beam indicator is turned on when a ground signal is sent to
the instrument cluster on CKT 1200. This signal is generated by the
headlamp dimmer switch when the headlamp switch is in either of the following
positions:
Refer to
Lighting System Operation
in Lighting Systems.
LOW COOLANT Indicator
The LOW COOLANT indicator receives battery voltage when the ignition
switch is in the following positions:
The instrument cluster will turn on the LOW COOLANT indicator for approximately
1 second during engine start in order to perform a bulb check. The
engine coolant level indicator module sends a ground signal to the instrument
cluster when the coolant level in the reservoir is below the minimum recommended
level.
Low Fuel Indicator
The low fuel indicator turns on when the fuel level signal received
from the Powertrain Control Module (PCM) indicates that the fuel level has
dropped below 1/8 of a tank.
LOW OIL Level Indicator
The Powertrain Control Module (PCM) controls the operation of the LOW
OIL indicator.
The following is a list of event that must take place, in this exact
order, for the PCM to take a reading of the engine oil level:
- The engine must be started.
- The engine coolant temperature must be allowed to reach 15-90°C
(59-194°F).
- The engine must be turned off.
- The engine coolant temperature must be allowed to cool down a
minimum of 12°C (22°F).
- The ignition switch must be turned back to on.
At this point, the PCM reads the engine oil level. The engine cool down
period allows ample time for the engine oil to drain back into the oil pan.
If none of the specific criteria are met as described above, the PCM will
not read the engine oil level.
LOW TRAC Indicator
The Antilock Brake System (ABS) sends the low traction data via the
class 2 serial data line. The LOW TRAC indicator alerts the driver
when the ABS is active. Anytime the Electronic Brake Control Module (EBCM)
determines that the vehicle has entered a braking event where the ABS is required,
the LOW TRAC indicator turns on in order to indicate that the ABS is active.
Refer to
ABS Operation
in
Antilock Brake System.
LOW WASHER FLUID Indicator
The LOW WASHER FLUID indicator turns on when the windshield washer solvent
level switch detects a low fluid level. The windshield washer solvent switch
grounds CKT 99 when the low fluid level is low.
Oil Pressure Indicator
The Powertrain Control Module (PCM) sends the oil pressure data via
the class 2 serial data line. The instrument cluster lights the oil
pressure indicator during a bulb test and also when the PCM has determined
that the oil pressure does not meet the specified value for that engine.
PERF SHIFT Indicator
The performance shift (PERF SHIFT) indicator turns on according to the
information sent along the class 2 serial data line. The performance
shift indicator will indicate to the driver whether or not the performance
mode has been selected at the performance shift switch. The PERF SHIFT indicator
is only available with 3.8L L67 (supercharged) engines.
SECURITY Indicator
The Body Control Module (BCM) sends the security data via the class 2
serial data line.
Refer to
Vehicle Theft Deterrent (VTD) Operation
in Theft Deterrent.
SERVICE ENGINE SOON Indicator
The Powertrain Control Module (PCM) controls the SERVICE ENGINE SOON
indicator through CKT 419. The PCM turns the indicator ON for approximately
3 seconds during engine start-up for a bulb check. The PCM lights the
SERVICE ENGINE SOON indicator in order to warn the driver that an engine control
malfunction has been detected. This condition may affect the engine performance.
SERVICE VEHICLE SOON Indicator
The following components may control the SERVICE VEHICLE SOON indicator:
| • | The Electronic Brake Control Module (EBCM) |
| • | The Powertrain Control Module (PCM) |
| • | The Body Control Module (BCM) |
The SERVICE VEHICLE SOON indicator will turn on for approximately 3 seconds
during engine start-up for a bulb check. The SERVICE VEHICLE SOON indicator
will turn on in order to warn the drive that a malfunction exists in the modules
listed above.
Speedometer and Odometer
The Vehicle Speed Sensor (VSS) is a gear-driven permanent magnet generator
housed in the transaxle. The sensor generates a sine wave output with a frequency
proportional to the vehicle speed. The Powertrain Control Module (PCM) uses
this information to generate a vehicle speed signal that is sent through the
class 2 serial data link; the instrument cluster then is able to utilize
this data for the operation of:
The season odometer displays the total accumulated miles/km of the vehicle.
This value is permanently stored in the Electronically Erasable Programmable
Read Only Memory (EEPROM) of the instrument cluster. Contact an authorized
Delco® service center in order to program the proper vehicles specifics
(including mileage) for the instrument cluster, if the following conditions
occur:
| • | An odometer malfunction. |
| • | The instrument cluster needs replacement. |
The trip odometer displays the accumulated mileage/km to the tenths
of a mile/km since the last reset. this value is stored in the Keep Alive
Memory (KAM) of the instrument cluster. The trip odometer may be reset on
the uplevel cluster by pressing the TRIP RESET button. The trip odometer may
be reset on the uplevel cluster by pressing the RESET button when the trip
information is being displayed in the Driver Information Display (DID). If
a button is not used in order to reset the trip odometer, the display will
roll over automatically at the following values:
| • | 999.9 miles (English mode) |
If the English/metric button is pushed again, the cluster converts the
displayed km value into miles.
When the trip odometer displays more than 621.4 miles (English
mode) and the English/metric button is pressed, the trip odometer performs
the following functions:
Tachometer
The tachometer displays the engine speed in RPMs. The engine RPM is
taken from the Powertrain Control Module (PCM) via the class 2 serial
data line. The instrument cluster compares the engine RPM data with a 16 point
look-up table in order to determine needle deflection. A smooth filter ensures
a continuous response. The instrument cluster drives the tachometer gauge
to 0 RPM if the following conditions occur:
| • | The engine RPM data is lost. |
| • | The PCM is in a state of health fault. |
TRAC OFF Indicator
The Antilock Brake System (ABS) sends the traction off indicator control
data via the class 2 serial data line. This indicator may be on if
one of the following functions occur:
| • | The Electronic Brake Control Module (EBCM) detects a condition
that causes the traction control system to be inhibited. |
| • | The traction control is turned off. |
Refer to
ABS Operation
in
Antilock Brake System.
Turn Signal Indicators
The instrument cluster receives the signal for turning on the turn signal
indicators through the following CKTs.
The instrument cluster and the respective turn signal lamps will begin
flashing, when the ignition is in the RUN position with the following conditions
present:
| • | The hazard warning switch is in the normal position. |
| • | The turn signal switch is in one of the following positions: |
If the hazard warning switch is in the HAZARD position, the following
components will begin flashing:
Refer to
Exterior Lights Circuit Description
in Lighting Systems.
Driver Information Display (DID)
The Driver Information Display calculates and displays the following
vehicle parameters:
| • | Instantaneous Fuel Economy (IFE) |
Only one of the parameters may be displayed at a time. The mode indicator
next to the corresponding graphics will light. The user may change the parameter
display by pressing the mode button located on the driver information display.
The operator may change units from English to metric by pressing the E/M button
on the face of the driver information display. The display is vacuum fluorescent
using the following display type:
| • | 7 segment with parameter units |
The telltale lamps or indicators deliver the following information to
the driver:
Average Fuel Economy
The Average Fuel Economy (AVG) can be displayed on the Driver Information
Display (DID) by pressing the MODE button until the display reads as one of
the following messages:
| • | Fuel Economy Average MPG |
| • | Fuel Economy AVG L/100 km |
The value for the Average Fuel Economy will be reset when the following
conditions occur:
| • | Average Fuel Economy displays on the DID |
| • | The RESET button is pushed |
The calculation for Average Fuel Economy is AFE = (Trip Distance)/(Trip
Fuel Used) x Scale Factor.
The Trip Distance is the distance traveled or the fuel used since the
last reset.
The Powertrain Control Module (PCM) sends the fuel used data. The dedicated
vehicle speed input sends the Trip Distance.
Instantaneous Fuel Economy (IFE)
The Instantaneous Fuel Economy (IFE) may be displayed on the DID by
pressing the FUEL button. The display reads one of the following messages:
| • | Fuel Economy Inst L/100 km |
Instantaneous Fuel Economy (IFE) is based on the previous few seconds
of driving as in the following calculation. The calculation for Instantaneous
Fuel Economy is IFE = Distance/Fuel Used x Scale Factor.
The Powertrain Control Module (PCM) sends the fuel data. The distance
is determined from the discrete vehicle speed input to the instrument cluster.
This parameter may not be reset by the driver. This portion of the instrument
cluster will be dashed if there is a loss of PCM communications.
The instrument cluster will dash the displays if the following components
are not communicating:
Range
The vehicle range displays an estimate of the expected remaining driving
distance using the current fuel level. The driving range is based on the following
conditions:
| • | The fuel economy of the last 25 miles. |
Because of the required predictions, the following messages may vary
from each other:
When the calculated range falls below 40 miles, the range display
will read LOW.
The vehicle range is calculated by the instrument cluster.
The calculation for the Vehicle Range is Estimated Drivable Range =
Distance Traveled/Fuel Used x Scale factor X Filtered Fuel in Tank.
The calculation is based on the last 25 miles. The calculation
is an estimate of the drivable range. The calculation may not be reset by
the driver. The data used in order to calibrate the range is lost if the battery
is disconnected. This portion of the instrument cluster will be dashed if
there is a loss of power to the Powertrain Control Module (PCM).
Oil Life
The instrument cluster reads oil life from the Powertrain Control Module
(PCM) via class 2 in the serial data line. The instrument cluster displays
a number received from the PCM in percentages. When 0% oil life is reached,
the instrument cluster shall perform the following functions:
| • | Extinguish the % units. |
If the oil life mode was not selected by the driver upon entering the
low oil life mode, then the instrument cluster performs the following functions:
| • | Override the mode being displayed |
| • | Select the oil life mode |
The driver may override the low oil life mode by selecting another mode.
If the ignition switch is cycled, the instrument cluster re-enters the mode
as if calculated for the first time. The RESET button transmits (while in
oil life mode) the reset signal back to the PCM via the class 2 serial
data line.
Boost (3.8L L67 supercharged engines only)
The Powertrain Control Module (PCM) controls the operation of the BOOST
indicator via the class 2. The following graphics will always be lit
with the engine running:
The gradations represent 0.6 PSI of boost. The gradations will
be lit if the pressure is equal to or greater than the gradient level.
