Express 1500 RWD V8-5.3L (2008)
Cruise Control: Symptom Related Diagnostic Procedures
Symptoms - Cruise Control
Symptoms - Cruise Control
Important: The following steps must be completed before using the symptom tables.
1. Before using the symptom diagnostic table, perform the Diagnostic System Check - Vehicle, See: Testing and Inspection/Initial Inspection and
Diagnostic Overview/Diagnostic System Check - Vehicle
in order to verify the following conditions:
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There are no DTCs set.
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The module can communicate via the serial data link.
2. Review the system operation in order to understand the system functions. Refer to Cruise Control Description and Operation.
Visual/Physical Inspection
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Inspect for aftermarket devices which can affect the operation of the cruise control system.
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Inspect the accessible system components or the visible system components for obvious damage or for obvious conditions which can cause the
symptom.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in
Diagnostic Aids. See: Testing and Inspection/Component Tests and General Diagnostics
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
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Cruise Control Malfunction
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Cruise Control Indicator Malfunction (Switch Indicator Malfunction) Cruise Control Indicator Malfunction (IPC Indicator Malfunction).
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 prior to using this diagnostic procedure. See: Testing and Inspection/Initial Inspection and
Diagnostic Overview/Diagnostic System Check - Vehicle
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Review Strategy Based Diagnosis for an overview of the diagnostic approach.
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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. The BCM provides the ground path for the LED through a dedicated dimming control circuit.
Pressing the switch again opens the switch and the lamp turns OFF.
