LaCrosse V8-5.3L (2008)
Cruise Control: Symptom Related Diagnostic Procedures
Cruise Control Indicator Malfunction (Switch Indicator Malfunction)
Cruise Control Indicator Malfunction (Switch 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.
Diagnostic Fault Information
Circuit/System Description
The cruise control switch contains an LED that illuminates to indicate the cruise control system has been switched ON. Voltage is applied through the
ON/OFF switch to the LED when the switch is pressed. Pressing the switch again opens the switch and the lamp turns OFF.
Diagnostic Aids
This diagnostic assumes the cruise control system is operating properly and no DTCs are set. If the cruise control system is malfunctioning, refer to
Cruise Control Malfunction (See: Cruise Control Malfunction).
If any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Diagnostic Trouble Code Descriptions).
Reference Information
Schematic Reference
Cruise Control Schematics (See: Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
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
Engine ON, press and release the cruise control ON/OFF switch while observing the Cruise On/Off Switch parameter in the ECM data list with a scan
tool. The parameter should change and the indicator lamp should turn ON or OFF accordingly each time the switch is actuated.
Circuit/System Testing
1. Ignition ON, with a scan tool observe the Cruise On/Off Switch parameter. Verify the parameter changes each time the switch is actuated
‹› If the parameter reads ON at all times replace the cruise control switch.
