Quote:
Originally Posted by CpoloGuru
I'm running through a dead car situation and I was looking for info about the batteries.
yesterday the car went through what I think is a shortcircuit situation and does not start. I'm trying to diagnose the situation
first the big battery for my shows 5.5 volts. I think that is wrong.
Second the piece in the middle of the two batteries has one of the connectors broken, that could be the cause of my problems?
third can I disconnect the battery to see if the 5.5 is because something else is broken??
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The X5s that have two batteries that are on opposite side of the center PCU (power control unit)...both batteries need to be disconnected if you’re trying to power down the vehicle. If you only disconnect the larger system battery...the smaller aux battery will still supply power to the vehicle.
The PCU controls power to the smaller aux battery through a cut-off relay.