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Test Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The number(s) below refer to the step number(s) on the diagnostic table.

  1. 2:  Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  2. 3:  The symptom list in Symptoms will determine the correct diagnostic procedure to use.
  3. 4:  The presence of DTCs which begin with "U" indicate that loss of Class 2 communications has occurred.
Diagnostic System Check - Head Up Display

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 modules:
    • Body Control Module (BCM)
    • Heads-Up Display (HUD)
    • Instrument Panel Cluster (IPC)
    • Powertrain Control Module (PCM)
    • Radio
Does the scan tool communicate with the control modules listed above?		 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 modules:
  • Body Control Module (BCM)
  • Heads-Up Display (HUD)
  • Instrument Panel Cluster (IPC)
  • Powertrain Control Module (PCM)
  • Radio

Does the scan tool display any DTCs?		 Go to Step 4  Go to Symptoms - Instrument Panel, Gages and Console 
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 DTC B1000, B1004, B1007, B1009, or B1440? Go to Diagnostic Trouble Code (DTC) List in Body Control System Go to Step 6 
6 Does the scan tool display DTC B1327, B1328, B1507, B1508, P0560, or P0620? Go to Diagnostic Trouble Code (DTC) List in Engine Electrical Go to Diagnostic Trouble Code (DTC) List 
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