Conditions for Setting the DTC

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

A DTC B1428 sets when the BCM detects a short to ground in the IGN 1 relay control feed circuit when it is trying to energize the IGN 1 relay.
A DTC B1428 sets when the BCM detects an open in the IGN 1 relay control feed circuit when it is trying to energize the IGN 1 relay.
The conditions above must be present for more than 0.3 second.