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Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. 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.

  1. 2:  Lack of communication may be due to partial or total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  2. 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.
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 the ignition ON.
  2. Use the scan tool in order to establish communication with the following modules:
    • 4WAL 3 Sensor
    • Powertrain
    • Instrument Panel Cluster
    • Body Control Module
Does the scan tool communicate with all of the control modules listed above?		 Go to Step 3  Go to Scan Tool Does Not Communicate with Class 2 Device (W/O Immobilizer) or Scan Tool Does Not Communicate with Class 2 Device (W/ Immobilizer) in Data Link Communications
3 Use the scan tool in order to display DTCs for the following control modules:
  • 4WAL 3 Sensor
  • Powertrain
  • Instrument Panel Cluster
  • Body Control Module

Does the scan tool display any DTCs for the control modules listed above?		 Go to Step 4  Go to Symptoms - Antilock Brake System 
4  Does the scan tool display any DTCs that begin with a "U", DTC C0290, C0292-C0297? Go to Scan Tool Does Not Communicate with Class 2 Device (W/O Immobilizer) or Scan Tool Does Not Communicate with Class 2 Device (W/ Immobilizer) in Data Link Communications Go to Step 5 
5 Does the scan tool display DTC P0500, P0502, P0503, P0562, P0563, P0601-P0607, P1381, P1621, P1627 or P1683? Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 4.2L or Diagnostic Trouble Code (DTC) List in Engine Controls 4.8L, 5.3L, and 6.0L Go to Step 6 
6 Does the scan tool display DTC B1372? Go to Diagnostic Trouble Code (DTC) List in Instrument Panel, Gages, and Console Go to Diagnostic Trouble Code (DTC) List 
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