Buick Regal: Lights On Indicator Malfunction
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
Circuit/System Description
With the headlight switch in the HEADLAMP or PARKLAMP position, the
appropriate headlamp
switch signal circuit is grounded through the headlight switch. The body control
module (BCM) then
sends a serial data message to the instrument cluster requesting the instrument
cluster to illuminate the
lights on indicator. With the turn signal/multifunction switch in the HIGH BEAM
or FLASH TO PASS
position the appropriate turn signal/multifunction switch signal circuit is
grounded through the turn
signal/multifunction switch. The BCM then sends a serial data message to the
instrument cluster
requesting the instrument cluster to illuminate the high beam indicator. The BCM
will also request the
instrument cluster to turn on the lights on indicator located in the driver
information center anytime the
headlamps are ON and the ignition is OFF or the driver door is opened.
Diagnostic Aids
This diagnostic procedure assumes that the headlamps operate as described in
Exterior Lighting Systems Description and Operation.
Reference Information
Schematic Reference
- Instrument Cluster Wiring Schematics
- Exterior Lights Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Testing
Lights On Indicator Malfunction
Ignition ON, command the All Indicators test ON and OFF with the scan tool,
verify that the lights on
indicator changes between turn ON and OFF.
- If the lights on indicator does not illuminate during the test or
remains illuminated at all times,
replace the P16 Instrument Cluster.
- If the lights on indicator illuminates during the test, replace the K9
Body Control Module.
High Beam Indicator Malfunction
Ignition ON, command the All Indicators test ON and OFF with the scan tool,
verify that the high beam
indicator changes between turn ON and OFF.
- If the high beam indicator does not illuminate during the test or
remains illuminated at all times,
replace the P16 Instrument Cluster.
- If the high beam indicator illuminates during the test, replace the K9
Body Control Module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic
procedure.
Control Module References for BCM or instrument cluster replacement, setup, and
programming.
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
Special Tools
EN-21867 Pressure Gauge
EN-21867-50 Transmission Line Pressure Adapter
For equivalent regional tools, refer to Special Tools.
Line Pressure
1. Apply the parking brake and chock the wheels.
2. Install an SLT current measuring machine.
If the machine is not available, installation
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure: Refer to Diagnostic System
Check - Vehicle
Review the description of Strategy Based Diagnosis: Refer to Strategy
Based Diagnosis
An overview of each diagnostic category can be found here: R