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 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
Powertrain Control Module Replacement/Programming
or
Powertrain Control Module Replacement/Programming
in Engine Controls.
|
The speedometer is operating improperly.
|
| • | Perform the diagnostics on the Vehicle Speed Sensor. |
| • | If the Speedometer is still malfunctioning, replace the Instrument
Cluster. Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console. |
|
The tachometer does not operate properly.
| Use Scan Tool
in order to monitor the PCM.
| • | If you detect an incorrect ENGINE RPM signal, refer to Engine
Controls for a diagnosis. |
| • | If the signal is OK, use Scan Tool
in order to monitor the BCM to cluster data in order to determine
if the tachometer is active. |
| - | If you detect 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 Scan Tool
in order to monitor the BCM to cluster data. |
| - | If you detect an incorrect engine coolant temperature signal,
perform an Instrument Cluster WOW in SPECIAL FUNCTIONS. |
| - | If the engine coolant temperature gauge still does not read correctly,
and the BCM is transmitting the wrong signal, replace the BCM. Refer to
Body Control Module Replacement
and
BCM Programming/RPO Configuration in Body Control Systems. |
| - | 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.
- 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 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 BCM to turn the ABS indicator on,
refer to
Diagnostic System Check
in Antilock Brake System. |
| • | 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 on, replace the BCM.
Refer to
Body Control Module Replacement
and BCM Programming/RPO Configuration in Body Control Systems. |
| - | 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 reading is OK, use the Scan Tool
in order to monitor the BCM to cluster data. |
| • | If the BCM is commanding the BRAKE indicator ON, replace the BCM.
Refer to
Body Control Module Replacement
and BCM Programming/RPO Configuration in Body Control Systems. |
|
The Check Engine indicator lights continuously.
| Refer to
Powertrain On Board Diagnostic (OBD) System Check
in Engine Controls.
|
CHECK OIL indicator lights continuously with no loss of serial data.
| Use theScan 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. |
| - | If the BCM is commanding the CHECK OIL indicator ON, replace the
BCM. Refer to
Body Control Module Replacement
and BCM Programming/RPO Configuration in Body Control Systems. |
| - | 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.
| - | If the BCM is commanding the CRUISE indicator ON, replace the
BCM. Refer to
Body Control Module Replacement
and BCM Programming/RPO Configuration in Body Control Systems. |
| - | 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
Instrument Cluster Replacement
in
Instrument Panel, Gauges and Console. |
| - | If the EBCM commands 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 ON, replace
the BCM. Refer to
Body Control Module Replacement
and BCM Programming/RPO Configuration in Body Control Systems. |
| • | 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 ON, replace the BCM. Refer to
Body Control Module Replacement
and BCM Programming/RPO Configuration
in Body Control Systems. |
| • | 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 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 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 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.
|
The oil pressure indicator lights continuously with no serial data loss.
|
- Use Scan Tool
in order to monitor the PCM.
If the PCM is commanding the oil pressure indicator ON, refer to
Powertrain On Board Diagnostic (OBD) System Check
in Engine
Controls.
- Use Scan Tool
in order to cluster the 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 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.
- Use 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 BCM Programming/RPO Configuration in
Body Control Systems.
- Use 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.
|
The seat belt indicator lights continuously with no serial data loss
and with the seat belt buckled.
| Use Scan Tool
in order to monitor the BCM INPUTS Park Brake Input.
| • | If OK, use Scan Tool
in order to monitor the BCM to cluster data. |
| - | If the BCM is commanding the seat belt indicator UNBUCKLED, replace
the BCM. Refer to
Body Control Module Replacement
and BCM Programming/RPO Configuration in Body Control Systems. |
| - | 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 improperly.
| Refer
to
Content Theft Deterrent (CTD) System Check
in Theft Deterrent .
|
The automatic light control does
not function.
| Refer to
Daytime Running Lights (DRL) System Check
in Lighting.
|
The phase loop lock indicates a fault.
| Replace the Instrument
Cluster. Refer to
Instrument Cluster Replacement
in Instrument Panel, Gauges and Console.
|
The air conditioning
does not function.
| Refer to
HVAC System Check
in HVAC Systems w/ A/C-Manual.
|
