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Test Description

WARNING: This page is about a different car, the 2004 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

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. 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.
Diagnostic System Check - Defogger

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:
    • Rear Integration Module (RIM)
    • HVAC Control Module
Does the scan tool communicate with the modules?		 Go to Step 3  Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications
3
IMPORTANT: 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 parameter in the Diagnostic Circuit Check menu on the scan tool.
  2. Rotate the ignition switch through all positions while observing the Class 2 Power Mode parameter.
Does the Class 2 Power Mode 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 following modules.
  • RIM
  • HVAC Control Module

Does the scan tool display any DTCs?		 Go to Step 5  Go to Symptoms - Stationary Windows 
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 Symptoms - Stationary Windows 
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