Conditions for Setting the DTC
WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
B1529 03
The BCM senses the reference voltage above witch voltage that is below 9.5 volts.
B1529 07
The BCM senses the reference voltage above witch voltage that is above 16 volts.