For 1990-2009 cars only
Important: The following steps must be completed before using the symptom tables.
- Before using the symptom diagnostic table, perform the Diagnostic Trouble Code (DTC) List - Vehicle in order to verify the following conditions:
- Review the system operation in order to understand the system functions. Refer to Cruise Control Description and Operation .
| • | There are no DTCs set. |
| • | The module can communicate via the GM LAN. |
Visual/Physical Inspection
| • | Inspect for aftermarket devices which can affect the operation of the Cruise Control System. Refer to Checking Aftermarket Accessories . |
| • | 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 .
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
