Symptom
| Procedure
|
Multiple indicators
light continuously.
| Inspect for serial data loss.
|
The Scan Tool
does not communicate with the body control module (BCM).
| Diagnose
and repair the serial data loss.
|
| • | The following indicators are ON: |
| - | The SERVICE VEHICLE SOON indicator |
| - | The THEFT SYSTEM indicator |
| • | The fuel and temperature gauges are at zero. |
| A loss of
the Serial Peripheral Interface (SPI) data bus has occurred. Perform the diagnostics
for the set DTCs. Refer to
Body Control Module System Check
.
|
The SERVICE VEHICLE SOON indicator does not
illuminate or is on continuously.
|
| • | Use the Scan Tool
in order to determine if any Diagnostic Trouble Codes (DTCs) are
current. If any DTCs are found, follow the proper diagnostic procedures. |
| • | Replace the body control module (BCM) under the following conditions: |
| - | The BCM is commanding the SERVICE VEHICLE SOON indicator ON. |
| - | There are no DTCs currently set. |
| • | If the BCM is not commanding on the SERVICE VEHICLE SOON, replace
the Instrument Cluster. Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console. |
|
The indicators do not light under any circumstance.
| Replace the Instrument Cluster. Refer to
Instrument Cluster Replacement
in Instrument
Panel, Gauges and Console. The LED indicators are not replaceable.
|
| • | The THEFT SYSTEM indicator is ON continually. |
| • | The BCM has been replaced. |
| Reprogram
the powertrain control module (PCM) in order to relearn the Theft Deterrent
System password. Refer to
Password Learn
in Engine Controls.
|
The speedometer is
operating improperly.
|
| • | Perform the diagnostics on the Vehicle Speed Sensor. Refer to
Engine Controls. |
| • | If the Speedometer is still malfunctioning, replace the Instrument
Cluster. Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console. |
|
Tachometer does not operate properly.
| Use the scan tool in order to monitor the
PCM.
| • | If there is an incorrect ENGINE RPM signal, refer to Engine Controls
for a diagnosis. |
| • | If the signal is OK, use the scan tool in order to monitor the
BCM to cluster data in order to determine if the Tach is active. |
| - | If there is an incorrect ENGINE RPM signal, refer to
Tachometer Inoperative
in Instrument Panel, Gauges
and Console. |
|
Engine coolant temperature gauge does not operate properly.
| Use the scan tool in order
to monitor the PCM.
| • | If the signal is OK, use the scan tool in order to monitor the
BCM to cluster data. |
| - | If there is an incorrect engine coolant temperature signal, perform
an instrument cluster WOW in SPECIAL FUNCTIONS. |
| - | If the engine coolant temperature signal is OK, replace the
instrument cluster. Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console. |
|
Fuel gauge does not operate properly.
|
- Perform an instrument cluster WOW in SPECIAL FUNCTIONS.
- Replace the cluster if the gauge does not sweep full range. Refer
to
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console.
- Use a Scan Tool
in order to read the DTC's.
Refer to
DTC P0462 Fuel Level Sensor Circuit Low Voltage
and
DTC P0463 Fuel Level Sensor Circuit High Voltage
or any Loss of Serial
Peripheral Interface (SPI) DTCs.
|
ABS indicator lights continuously with no
loss of serial data.
| Use the scan tool in order to monitor the electronic brake control module
(EBCM).
| • | If the EBCM is commanding the ABS indicator off, use the scan
tool in order to monitor the BCM SPI serial data bus. |
| • | Inspect the CKT 849 at the level switch for a short to
ground. |
| • | Replace the level switch with a known good switch if a short to
ground is found in CKT 849. |
| - | If the BCM is commanding the ABS indicator off, replace the
Instrument Cluster. Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console. |
|
| • | The brake indicator lights continuously with no loss of serial
data. |
| • | The park brake is released. |
| • | The EBCM is not commanding the brake indicator to illuminate. |
| Use the
scan tool in order to monitor the BCM INPUTS park brake input.
| • | If the reading is OK, use the scan tool in order to monitor
the EBCM. |
| - | If the EBCM is commanding the BRAKE indicator ON, refer to Antilock
Brake Systems in Brakes. |
| - | If the reading is OK, use the scan tool in order to monitor
the BCM to cluster data. |
| • | If the BCM is not commanding the BRAKE indicator ON, replace
the Instrument Cluster. Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console. |
|
Check Engine indicator lights continuously.
| Refer to Engine Controls.
|
CHECK OIL indicator
lights continuously with no loss of serial data.
| Use the scan tool in order to monitor the
PCM.
| • | If the PCM is commanding the CHECK OIL indicator OFF, use the
scan tool in order to monitor the BCM SPI serial data link. |
| - | Monitor the BCM to cluster data - CHECK OIL LIGHT. |
| - | If the BCM SPI serial data link is commanding the CHECK OIL
indicator OFF, and the indicator remains lit, replace the Instrument Cluster.
Refer to the
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console. |
|
CRUISE indicator lights continuously with no loss of serial data.
| Use the scan tool in order
to monitor the PCM.
- If the PCM is commanding the CRUISE indicator ON, refer to
Cruise Control System Check
.
- If the CRUISE indicator is OFF, use the scan tool in order to
monitor the BCM to cluster data.
| - | Monitor the BCM cluster data CRUISE LAMP ON/OFF. |
| - | If the BCM SPI serial data link is commanding the CRUISE indicator
OFF, and the indicator remains lit, replace the Instrument Cluster. Refer
to the
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console. |
| - | In the event of the EBCM commanding the BRAKE indicator to illuminate
the CRUISE function will be canceled. |
|
Fuel gauge check indicator remains ON when gauge pointer is in normal range
or fails to light when the pointer is out of range.
| Use the scan tool in order to monitor
the BCM to cluster data.
| • | If the BCM is commanding the fuel gauge check indicator OFF,
and the indicator remains lit, replace the instrument cluster. Refer to
the
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console. |
|
High beam indicator operates improperly.
| Refer to
Headlamps Inoperative - High Beams
in Lighting Systems. If this is OK, replace
the Instrument Cluster. Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console.
|
Engine coolant temperature gauge check indicator remains ON when gauges pointers
are in normal range or fails to light when pointers are out of range.
| Use the scan tool
in order to monitor the BCM to cluster data.
| • | If the BCM is commanding the engine coolant temperature gauge
check indicator OFF and the indicator remains lit, replace the instrument
cluster. Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console. |
|
Left turn signal operates improperly.
| Refer to
Turn Signal Lamps Inoperative - Hazard Lamps Operate
in Lighting Systems.
|
Right turn signal
operates improperly.
| Refer to
Turn Signal Lamps Inoperative - Hazard Lamps Operate
in Lighting Systems.
|
Low coolant indicator lights
continuously.
|
- Use the scan tool in order to monitor the BCM INPUTS.
If the low coolant indicator is ON, refer to
Powertrain On Board Diagnostic (OBD) System Check
for diagnosis.
- Use the scan tool in order to monitor the BCM to cluster data.
If the BCM is commanding the low coolant indicator OFF and the low
coolant indicator remains lit, replace the instrument cluster. Refer to
Instrument Cluster Replacement
in Instrument
Panel, Gauges and Console.
|
LOW WASH indicator operates improperly.
|
- Use the scan tool in order to monitor the BCM INPUTS.
- Use the scan tool in order to monitor the BCM to cluster data.
If the BCM is commanding the LOW WASH indicator OK and the indicator
remains lit, replace the Instrument Cluster. Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges
and Console.
|
Oil pressure indicator lights continuously with no serial data loss.
|
- Use the scan tool in order to monitor the PCM.
If the PCM is commanding the Oil Pressure indicator ON, refer to Engine
Controls for diagnosis.
- Use the scan tool in to cluster data.
If the BCM is commanding the Oil Pressure indicator OFF and the Oil
Pressure indicator remains lit, replace the Instrument Cluster. Refer to
Instrument Cluster Replacement
in Instrument
Panel, Gauges and Console.
|
PRNDL display does not operate properly with no serial data loss.
|
- Use the scan tool in order to monitor the PCM.
If the GEAR POSITION matches the PRNDL, refer to
Powertrain On Board Diagnostic (OBD) System Check
in Engine Controls for diagnosis.
- Use the scan tool in order to monitor the BCM to cluster data.
If the BCM command does not match the TRANSAXLE RANGE reading from the
PCM, replace the BCM. Refer to
Body Control Module Replacement
and
Body Control Module (BCM) Programming/RPO Configuration
.
- Use the scan tool in order to monitor the BCM to cluster data.
If the PRNDL display on the Instrument Cluster does not match the GEAR
POSITION, replace the Instrument Cluster. Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges
and Console.
|
Seat belt indicator lights continuously with no serial data loss and the seat
belt buckled.
| Use the scan tool in order to monitor the BCM INPUTS Park Brake Input.
| • | If the BCM is reading the Seat Belt Input UNBUCKLED, refer to
Audible Warnings. |
| • | If OK, use the scan tool in order to monitor the BCM to cluster
data. |
| - | If the BCM is commanding the Seat Belt indicator BUCKLED, replace
the Instrument Cluster. Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console. |
|
THEFT SYSTEM indicator lights continuously or operates properly.
| Refer to Theft Deterrent
System.
|
Automatic light control does not function.
| Refer to automatic light control DTCs in Body
Control Systems
|
Air conditioning does not function.
| Refer to Heating and Air Conditioning in HVAC
Systems w/ A/C-Manual.
|
