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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 841 (ANTILOCK BRAKE SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC SYSTEM CHECK - ABSCIRCUIT DESCRIPTION
1999 GMC Forward Control 5.7 R, Automatic

Circuit Description

1999 GMC Forward Control 5.7 R, AutomaticSECTION Circuit Description
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The antilock brake system (ABS) Diagnostic System Check is an organized approach to identify problems associated with the electronic brake control module (EBCM). This check must be the starting point for any EBCM complaint, and will direct you to the next logical step in diagnosing the complaint. The EBCM is a very reliable component and is not likely the cause of the malfunction. Most system complaints are linked to faulty wiring, connectors, and occasionally to components. Understanding the ABS system and using the tables correctly will reduce diagnostic time and prevent unnecessary parts replacement.

Diagnostic System Check - ABS

Step Action Yes No
1 Install a scan tool.
Does the scan tool power up?		 Go to Step 2  Go to Scan Tool Does Not Power Up in Data Link Communications
2
  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to establish communication with the following control modules:
    • Body control module (BCM)
    • Electronic brake control module (EBCM)
    • Instrument panel module (IPC)
    • Powertrain control module (PCM)
Does the scan tool communicate with all control modules?		 Go to Step 3  Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications
3 Select the display DTCs function on the scan tool for the following control modules:
  • Body control module (BCM)
  • Electronic brake control module (EBCM)
  • Instrument panel module (IPC)
  • Powertrain control module (PCM)

Does the scan tool display any DTCs?		 Go to Step 4  Go to Symptoms - Antilock Brake System 
4 Does the scan tool display any DTCs which begin with a "U" ? Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications Go to Step 5 
5 Does the scan tool display any DTCs which begin with a "B"? Go to Diagnostic Trouble Code (DTC) List in Body Control System Go to Step 6 
6 Does the scan tool display any DTCs which begin with a "P"? Go to Diagnostic Trouble Code (DTC) List in Battery Go to Diagnostic Trouble Code (DTC) List 
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.