Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Power Control Unit (PCU): Notes: Overview
The Power Control Unit (PCU) control unit supports the vehicle electrical system.
The vehicle electrical system is split in two:
- Vehicle electrical system basic version with battery, starter motor, alternator and the electrical consumers
- Additional vehicle electrical system with auxiliary battery
The Power Control Unit (PCU) provides energy management between these two vehicle electrical systems under all operating conditions.
The use of the Power Control Unit depends on the motorisation or one or more of the following items of optional equipment (as at 07/2013):
| Optional equipment | Designation |
|---|---|
| SA496 | Seat heating in the rear passenger compartment |
| SA536 | Auxiliary heating |
| SA601 | TV Function |
| SA6FH | Rear seat entertainment system |
| SA791 | BMW Individual cool box |
US: 100% at N63TU and S63TU
US: dependent on optional equipment with N55 and N57
EURO: dependent on optional equipment with N63TU and S63TU
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.