Conditions for Clearing the DTC
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- A current DTC B1478 will clear if the short to battery in the RAP relay control circuit is no longer detected by the BCM when the RAP relay is commanded to energize.
- A history DTC B1478 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.