Symptom Related Diagnostic Procedures
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Torque wrench
Use the factory procedure with the right tightening tool.
Manual-based work becomes much easier when you can torque correctly.
Shop on Amazon →Trim tool set
Useful for clips, covers, and trim pieces called out by the manual.
Most manual procedures assume you have a good trim removal kit.
Shop on Amazon →Multimeter kit
Great for electrical troubleshooting and manual-tested circuits.
Electrical work in manuals often needs a meter more than another wrench.
Shop on Amazon →SYMPTOMS - COMPUTER/INTEGRATING SYSTEMS
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:
- There are no DTCs set.
- The control modules can communicate via the serial data links.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to:
- Data Link Communications Description and Operation
- Body Control System Description and Operation
Visual/Physical Inspection
- Inspect for aftermarket devices which could affect the operation of the systems.
- 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. Component Tests and General Diagnostics
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
- Scan Tool Does Not Power Up Scan Tool Does Not Power Up
- Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with High Speed GMLAN Device
- Scan Tool Does Not Communicate with Low Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device