WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
Battery Voltage - BCM
Circuit
Short to Ground
Open
Short to Voltage
Operating Conditions:
Ignition ON, engine OFF. Parameter Normal Value:
12.60 Volts