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Test Description

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. 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. 4:  The Symptom Table will determine the correct diagnostic procedure to use.
  3. 5:  The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
  4. 6:  This step determines if any internal controller DTCs are set.
  5. 7:  This step determines if any system voltage DTCs are set.
Diagnostic System Check - Door Systems

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 body control (BCM) module.
Does the scan tool communicate with the BCM?		 Go to Step 3  Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications
3
IMPORTANT: The engine may start during the following step. Turn OFF the engine as soon as you have observed the Crank power mode.
  1. Access the Class 2 Power Mode in the Diagnostic Circuit Check on the scan tool.
  2. Rotate the ignition switch through all positions while observing the ignition switch power mode parameter.
Does the ignition switch parameter reading match the ignition switch position for all switch positions?		 Go to Step 4  Go to Power Mode Mismatch in Body Control System
4  Select the display DTCs function on the scan tool for the BCM.
Does the scan tool display any DTCs?		 Go to Step 5  Go to Symptoms - Doors 
5  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 6 
6  Does the scan tool display DTCs B1000, B1004, B1007, or B1009? Go to Diagnostic Trouble Code (DTC) List in Body Control System Go to Step 7 
7  Does the scan tool display DTCs B1327 or B1328? Go to Diagnostic Trouble Code (DTC) List in Engine Electrical Go to Step 8 
8 Does the scan tool display DTC B1475? Go to Diagnostic Trouble Code (DTC) List in Retained Accessory Power Go to Diagnostic Trouble Code (DTC) List in Body Control System
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