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Home >> Buick >> 2004 >> Regal GS >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays, Gauges And Console >> Diagnostic Information and Procedures >> Diagnostic System Check - Instrument Cluster >> Test Description

Test Description

The numbers below refer to the step numbers 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 U1000-U1305 indicate some other module is not communicating on the class 2 serial data circuit. The specified procedure will compile all the available information before tests are performed.
Diagnostic System Check - Instrument Cluster

Step Action Yes No
Schematic Reference:  Instrument Cluster Schematics  
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, 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 Cluster (IPC)
    • Powertrain Control Module (PCM)
    • Inflatable Restraint Sensing and Diagnostic Module (SDM)
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 control modules:
  • Body Control Module (BCM)
  • Electronic Brake Control Module (EBCM)
  • Instrument Panel Cluster (IPC)
  • Powertrain Control Module (PCM)
  • Inflatable Restraint Sensing and Diagnostic Module (SDM)

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 DTCs that begin with "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, B1013, B1334, B1339, B1354, or B1422? Go to Diagnostic Trouble Code (DTC) List in Body Control System Go to Step 6 
6 Does the scan tool display DTC P0560 or P0620? Go to Diagnostic Trouble Code (DTC) List in Engine Electrical Go to Diagnostic Trouble Code (DTC) List 
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