Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic table.

2. Lack of communication may be due to partial or total malfunction of the serial data circuit. The specified procedure will determine the particular condition.
4. The presence of DTCs that begin with a "U" indicates that some other module is not communicating. The specified procedure will compile all of the available information before tests are performed.

Fig 1: Diagnostic System Check - ABS (Steps 1-2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Diagnostic System Check - ABS (Steps 3-6)

Courtesy of GENERAL MOTORS CORP.