Conditions for Clearing DTC
WARNING: This page is about a different car, the 2001 GMC Safari and 2001 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
Current DTC B1000 will clear when microprocessor makes a successful write to EEPROM and check sum maneuver. A history DTC B1000 will clear after 100 consecutive ignition cycles if condition for malfunction is no longer present.