Test Description

The number below refers to the step number on the diagnostic table. See Fig 1.

1. 3
   
   Tests for the proper operation of the 12v reference Security Sensor Power circuit, sensor ground circuit, and Passlock™ sensor signal (data) circuit. Troubleshoot the appropriate DTC prior to diagnosing DTC B3031.
Fig 1: DTC B3031 Diagnostic Table (Steps 1-4)
Courtesy of GENERAL MOTORS CORP.