GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2003 🢒 Grand Prix 🢒 Body and Accessories 🢒 Instrument Panel, Gages, and Console 🢒 Diagnostic System Check - Audible Warnings

Test Description

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

  1. 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.

  2. 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.

Step

Action

Yes

No

Schematic Reference: Audible Warnings 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:
    3. • Body Control Module (BCM)
    • Driver Information Center (DIC)
    • Electronic Brake Control Module (EBCM)
    • Instrument Panel Cluster (IPC)
    • Powertrain Control Module (PCM)
    • Radio
    • Supplemental Inflatable Restraint (SIR)

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)
    • Driver Information Center (DIC)
    • Electronic Brake Control Module (EBCM)
    • Instrument Panel Cluster (IPC)
    • Powertrain Control Module (PCM)
    • Radio
    • Supplemental Inflatable Restraint (SIR)

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, or C0550?

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