Scion xB Battery Problem

Yes.There are a lot of newer vehicles that utilize generators where the voltage is controlled by the ECU instead of an alternator. There’s two reasons for this. First, generators are cheaper. But most importantly with a DC generator there’s no chance for AC ripple voltage from a failed rectifier from an alternator to confuse/damage the sensitive computers/modules in todays vehicles.

I know of a lot of people who’ve tried replacing the battery/generator (thinking it’s an alternator) trying to figure out why the battery won’t charge. When all the long it’s a faulty ECU that’s preventing the battery from charging.

Tester