Charge Mode

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The BCM will enter Charge Mode when ever one of the following conditions are met:

The interpreted fuel rate is greater than 21 g/s and the throttle position is greater than 90%.
The headlamps are ON, low or high beam.
The wipers are ON for more than 8 seconds.
The electric cooling fans are on high speed.
The rear defogger is ON.

Once one of these conditions are met, the generator battery control module will set the targeted generator output voltage to 13.4 volts and then ramp that voltage up to 14.5 volts at a rate of 50 mV per second.