Conditions for Clearing the DTC
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- A current DTC B2578 will clear if the BCM no longer detects a short to battery positive voltage in the autolamp relay control circuit, after the ignition is cycled.
- A history DTC B2578 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
- The BCM receives a clear code command from the scan tool.