WARNING: This page is about a different car, the 2002 GMC Safari, 2002 Chevrolet Astro, 2001 GMC Safari, and 2001 Chevrolet Astro. 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.
2. Verifies that DTC B2947 is a current DTC.
3. Tests for a short to ground in the Passlock™ sensor or the pigtail harness.