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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 687 (Power Seat System) >> Diagnostic Information and Procedures >> Diagnostic System Check - Power Seat Systems >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. 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 or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  2. 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 - Power Seat 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
2 
  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to establish communication with the Seat Module and the Drivers Door Module.
Does the scan tool communicate with both Seat Modules and the Drivers Door Module?		 Go to Step 4  Go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE
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
4 Select the Seat Module and the Drivers Door Module display DTCs function on the scan tool.
Does the scan tool display any DTCs?		 Go to Step 5  Go to Symptoms - Seats 
5  Does the scan tool display any DTC that begins with a "U"? Go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE Go to Step 6 
6 Does the scan tool display B1000? Go to Body Control System Check Go to DTC ListDiagnostic Trouble Code (DTC) List 
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