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Home >> BMW >> 2019 >> X3 M40i >> Repair and Diagnosis >> External Pages >> Different car >> Section 576 (Functional Descriptions - F25 - Charging System, Anti-Theft, Body Electrical Systems) >> Body Electrical System - Functional Description >> Power Control Unit (PCU) >> Brief component description >> System battery and auxiliary battery

System battery and auxiliary battery

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Both batteries are installed in the luggage compartment together with the PCU control unit.

The vehicle electrical system battery is an AGM battery with 90 Ah. The auxiliary battery is a 50 Ah AGM battery.

The electrical connections are presented in the functional networking.

Fig 1: Identifying PCU Control Unit And Auxiliary Battery
G09872903Courtesy of BMW OF NORTH AMERICA, INC.
Item Explanation
1 Auxiliary battery
2 PCU control unit
3 System battery