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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1852 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC B3031 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 3:  Tests for the proper operation of the 12-volt reference Security Sensor Power circuit, sensor ground circuit, and Passlock™ sensor signal data circuit. Troubleshoot the appropriate DTC prior to diagnosing DTC B3031.
DTC B3031

Step Action Yes No
Schematic Reference: Immobilizer Schematics 
Connector End View Reference: Immobilizer Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Momentarily rotate the ignition switch to CRANK. Do not start the vehicle.
  3. Release the ignition switch to ON.
  4. Select the body control module (BCM) display DTCs function on the scan tool.
Does the scan tool display DTC B3031 as a current DTC?		 Go to Step 3  Go to Step 4 
3  Does the scan tool display DTC B2947, B2948, B2957, B2958, B2960, or B3033? Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 4 
4
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition.
  3. Start the vehicle.
  4. Select the body control module display DTCs function on the scan tool.
Does the DTC reset?		 Go to Step 3  System OK
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