LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1141 (Sunroof System) >> Diagnostic Information and Procedures >> Diagnostic System Check - Power Sunroof >> Test Description

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 numbers 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 symptoms list in Symptoms 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. 7:  The presence of either of these DTCs indicates lack of power being supplied through Retained Accessory Power (RAP), that will inhibit sunroof operation. The specified procedure will compile all the available information before tests are performed.
Diagnostic System Check - Power Sunroof

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 Body Control Module (BCM).
Does the scan tool communicate with the control module?		 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 DTC function on the scan tool for the BCM.
Does the scan tool display any DTCs?		 Go to Step 5  Go to Symptoms - Roof 
5  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 6 
6 Does the scan tool display DTC B1000? Go to Diagnostic Trouble Code (DTC) List in Body Control System Go to Step 7 
7  Does the scan tool display DTC B1477 or B1478? Go to Diagnostic Trouble Code (DTC) List in Retained Accessory Power Go to Symptoms - Roof 
scientia non olet · About LEMON Manuals