Conditions for Clearing the DTC
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- A current DTC B2578 clears if the BCM no longer detects a short to battery positive voltage in the low beam headlamp relay control circuit or the headlamp relay control circuit.
- A history DTC B2578 clears after 100 consecutive ignition cycles.
- The BCM receives the clear code commend from the scan tool.