For 1990-2009 cars

Important: The following steps must be completed before using the symptom table.

1. Perform the Diagnostic Trouble Code (DTC) List - Vehicle before using the symptom table in order to verify the following conditions:

• | No DTC is set.

• | The module(s) can communicate via GMLAN.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to Cruise Control Description and Operation .

### Visual/Physical Inspection

• | Inspect for aftermarket devices which could affect the operation of the Cruise Control system. Refer to Checking Aftermarket Accessories .

• | 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 .

### Symptom List

• | Cruise Control Gap Up/Down Switch Malfunction

• | Cruise Control Inoperative/Malfunctioning