Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

If the horn relay control circuit is shorted to ground the horns will remain on at all times.
If the horn relay control circuit is open the horn will only operate with the horn button on the steering wheel.
The BCM stores DTC B2527 in memory.