Symptoms - Antilock Brake System. GMC Truck Sonoma Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2002 🢒 Sonoma Pickup - 4WD 🢒 Body and Accessories 🢒 Data Link Communications 🢒 Symptoms - Antilock Brake System

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

Perform the ABS Diagnostic 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 modules can communicate via the serial data link.

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

•	Inspect for aftermarket devices which could affect the operation of the ABS. 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 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:

•	ABS Indicator Always On

•	ABS Indicator Inoperative