Symptoms. GMC Truck GMC C Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2000 🢒 GMC C Pickup - 2WD 🢒 Body and Accessories 🢒 Data Link Communications 🢒 Symptoms

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

Perform the OnStar System Check before using the Symptom Tables in order to verify that all of the following are true:

•	There are no DTCs set.

•	The control module(s) can communicate via the serial data link.

Review the system operation in order to familiarize yourself with the system functions. Refer to the following: OnStar Operation

•	Inspect for aftermarket devices which could affect the operation of the power windows, power door locks, or power mirrors. Refer to Checking Aftermarket Accessories in Wiring Systems.

•	Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

•	No (or Noisy) OnStar Audio

•	OnStar One or More Buttons Inoperative

•	OnStar Call Center Lock/Unlock Commands Inoperative

•	OnStar Call Center Unable to Locate Vehicle

•	OnStar Operator Unable to Hear Caller

•	OnStar No or Poor Cellular Reception

•	OnStar Will Not Power Up

•	OnStar Button LED Inoperative

•	Unable to Contact OnStar Call Center

•	OnStar Call Center Unable to Configure OnStar (R) System