Mercedes W211 w/SBC Unit Error Code SBC Undervolted

Like the Thread title says I was trying to Bleed the brakes on my W211, and got a error saying "SBC Voltage= 11.3", with only one button "ABORT" So whats up with that? So once i click abort, it finished the whole process & it claims SBC Voltage was to low and there was a error bleeding.

Thanks Guys!

EDIT: Just Diagnosed my electrical system with SDS, it turns out i have a faulty Aux. Battery Relay could this be the source of the SBC under voltage.