Air Bag Warning Indicator
The inflatable restraint diagnostic energy reserve module path sensor
(SDM) over the class 2 serial data line controls the air bag indicator.
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.
ANTI-LOCK Indicator
The electronic brake control module (EBCM) over the class 2
serial data line controls the ANTI-LOCK warning indicator. 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.
Automatic Transaxle Control Position Indicator
The powertrain control module 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 bus |
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 bus. |
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.
Charge Warning Indicator
The powertrain control module (PCM) via the class 2 serial data
line controls the charge warning indicator. The instrument cluster turns lights
the charge indicator under the following conditions:
| • | When the powertrain control module (PCM) detects an undervoltage
(11.2 Volts) or overvoltage (16.5 Volts) |
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 tightness in the dim mode. The PWM dimming
signal of the instrument dimming control shall control further dimming.
The display may go blank upon the lowest dimming request of the dimming
control.
Coolant TEMP Indicator
The coolant temperature data is calculated within the powertrain control
module (PCM). The PCM via the class 2 serial data line controls the
coolant TEMP indicator. The instrument cluster lights the coolant TEMP
indicator when the PCM determines that the engine coolant temperature
has reached a value of approximately 124°C (255°F).
Engine Coolant Temperature Gauge
The powertrain control module (PCM) via the class 2 serial data
line to the instrument cluster, broadcasts the coolant temperature. 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 BCM via the class 2 serial
data line. The BCM sends a signal in order to turn on the seat belt warning
indicator under the following 2 conditions occur:
| • | The BCM detects that the ignition switch is in the RUN position. |
| • | The seat belt has not been latched. |
Fuel Gauge
The powertrain control module (PCM) via the class 2 serial data
line to the instrument cluster broadcasts the fuel level data. 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
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 IP on circuit 11. This signal is generated by the headlamp dimmer
switch when the headlamp dimmer switch is in either of the following positions:
LOW COOLANT Indicator
The LOW COOLANT indicator receives battery voltage when the ignition
switch is in the following positions:
The instrument cluster will turn the indicator ON for approximately
1 second during engine start up in order to perform a bulb check. The
engine coolant level switch grounds the indicator with the coolant
level in the coolant reservoir below the minimum recommended level.
Low Fuel Indicator
The low fuel indicator comes on when the fuel level signal to the fuel
drops below 1/8 of a tank.
LOW OIL Level Indicator
The powertrain control module (PCM) via the class 2 data line
controls the LOW OIL level indicator. The PCM samples the oil level 1 per
ignition cycle, only at power-up. Test for low oil level at the start-up
when one of the following conditions present:
| • | If the engine coolant temperature was between 15°C (59°F)
and 90°C (194°F) at the last key OFF, ensure that the engine coolant
temperature at key ON is at least 12°C (22°F) cooler than the
engine coolant temperature at the last key OFF. |
| • | If the engine coolant temperature was higher than 90°C (194°F)
at the last key OFF, ensure that the time between the last key OFF and the
present key ON is sufficient in order to allow the oil to drain back
to the sump. The PCM will remain powered up for 10 seconds in
order to ensure that the oil has drained back to the sump. If the key
is turned back to ON while the PCM is still powered up, the oil level
will not be tested. |
| • | The LOW OIL level indicator lights under the following conditions: |
| - | When the PCM determines that a low oil level condition exists |
| - | During a period of time when the ignition is first turned ON for
a bulb test |
LOW TRAC Indicator
The antilock brake system (ABS) via the class 2 serial data line
sends the low traction data. 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.
LOW WASHER FLUID Indicator
The LOW WASHER FLUID indicator lights up when the windshield washer
solvent level switch detects a low fluid level. The windshield washer solvent
switch pulls the low washer input to the instrument cluster in order
to ground through circuit 99 when the low fluid level is sensed.
Oil Pressure Indicator
The powertrain control module (PCM) via the class 2 serial data
line senses the oil pressure data. The instrument cluster lights the oil pressure
indicator during a bulb test when the PCM has determined that the
oil pressure does not meet the specified value for that engine.
SECURITY Indicator
The BCM via the class 2 serial data line sends the security data.
This indicator may be in the following conditions:
Refer to
Vehicle Theft Deterrent (VTD) System Check
in Theft Deterrent.
SERVICE ENGINE SOON Indicator
The powertrain control module (PCM) controls the SERVICE ENGINE SOON
indicator through circuit 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. Refer to
Powertrain On Board Diagnostic (OBD) System Check
in Engine Controls - 2.5L (L8) and 3.0L (L46).
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 the engine star-up for a bulb check. The SERVICE VEHICLE SOON indicator
will turn on in order to warn the drive that a malfunction exists
within the following systems:
| | Refer to Antilock Brake System. |
| | Refer to Body Control System. |
This condition may degrade the overall vehicle performance.
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) converts the signal to an output that switches to ground at
a frequency of 4000 pulses per kilometer. The signal (circuit 817)
is used by various vehicle components. The signal circuit 817
drives the following components:
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.
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 cluster by pressing the TRIP RESET button.
The trip odometer will roll over to the following values:
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
16 point look-up table in order to determine needle deflection.
A smooth filter secures 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) vial the class 2 serial data
line sends the traction off data. 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
Diagnostic System Check - ABS
in Antilock
Brake System.
Turn Signal Indicators
The instrument cluster receives the signal for turning on the turn signal
indicators through the following circuits.
| • | Circuit 15 (right turn) |
The IC 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
Diagnostic Starting Point
in
Lighting Systems.
Driver Information
| • | 7 segment with parameter units |
The telltale lamps or indicators deliver the following information to
the driver:
The telltale lamps or indicators will light when either of the following
conditions occur:
| • | A grounding switch is closed. |
| • | One of the pertinent modules provides a path to ground for that
indicator. |
