LaCrosse V6-3.8L (2009)
Cruise Control: Symptom Related Diagnostic Procedures
Cruise Control Indicator Malfunction (IPC Indicator Malfunction)
Cruise Control Indicator Malfunction (IPC Indicator Malfunction)
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
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Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
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Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure Instructions)
provides an overview of each diagnostic category.
Circuit/System Description
The instrument panel cluster (IPC) illuminates the cruise control engaged indicator based on serial data messages received from the engine control
module (ECM). The indicator is commanded ON when the cruise control system is controlling vehicle speed, and turned OFF with the system
disengaged.
Reference Information
Schematic Reference
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Cruise Control Schematics (See: Diagrams/Electrical Diagrams)
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Instrument Cluster Schematics (See: Diagrams/Electrical Diagrams/Instrument Panel, Gauges and Warning Indicators/System
Diagram/Instrument Cluster Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
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Cruise Control Description and Operation (See: Description and Operation)
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Indicator/Warning Message Description and Operation (See: Instrument Panel, Gauges and Warning Indicators/Description and
Operation/Indicator/Warning Message Description and Operation)
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, with a scan tool perform the Lamp Test for the instrument panel cluster (IPC) and observe the cruise control indicator.
If the cruise control indicator illuminates during the test, replace the ECM.
If the cruise control indicator does not illuminates during the test or remains illuminated at all times, replace the IPC.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble
Code Tests and Associated Procedures/Verification Tests and Procedures) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM or IPC replacement, setup, and programming
