Lucerne V6-3.8L VIN 2 (2006)
Body Control Module: Symptom Related Diagnostic Procedures
A Symptoms - Computer/Integrating Systems
SYMPTOMS
IMPORTANT: The following steps must be completed before using the symptom tables.
1. Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true:
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There are no DTCs set.
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The control modules can communicate via the serial data links. See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures
2. Review the system operation in order to familiarize yourself with the system functions. Refer to:
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Data Link Communications Description and Operation
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Retained Accessory Power (RAP) Description and Operation
Visual/Physical Inspection
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Inspect for aftermarket devices which could affect the operation of the systems.
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Inspect the easily accessible or visible system components for obvious damage or conditions which could 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.
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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Scan Tool Does Not Power Up See: Information Bus/Testing and Inspection/Scan Tool Does Not Power Up
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Scan Tool Does Not Communicate with High Speed GMLAN Device See: Information Bus/Testing and Inspection/Scan Tool Does Not
Communicate with High Speed GMLAN Device
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Scan Tool Does Not Communicate with Low Speed GMLAN Device See: Information Bus/Testing and Inspection/Scan Tool Does Not
Communicate with Low Speed GMLAN Device
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Retained Accessory Power (RAP) Malfunction. See: Retained Accessory Power (RAP) Malfunction
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Power Mode Mismatch See: Starting and Charging/Testing and Inspection/Symptom Related Diagnostic Procedures/Power Mode Mismatch
