How to

Powering down the high voltage on a BMW 330e

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There’s any number of reasons why you might need to power down (or ‘de-energize’) the high voltage on a vehicle. But HV batteries are potentially hazardous, and you must take care to do it safely.

In this video, watch as Matt, our Delphi expert, walks you through the process on a BMW 330e with the help of our diagnostic tool. He covers:

Using the Direct Evolution system to find the right instructions for your vehicle
Finding the right de-energizing instructions
Connecting your diagnostic tool
Running the de-energizing process
Viewing high voltage values during the process

Vehicle Electronics & Engine Management How to Distributors Shop Owners Technicians

Do I need to wear PPE to de-energize a vehicle?

For the BMW model above, you don’t. But for many you will. The manufacturer’s instructions should tell you – but if in doubt, take the safe option and wear PPE.

Is the procedure the same for all makes and models?

Not necessarily. It’s essential that you check the manufacturer’s instructions before going ahead, as there may be important additional steps you must take.

What is Delphi Direct Evolution?

Direct Evolution is Delphi’s technical information software package. It provides access to parts information, application data, repair manuals and service notes for a wide range of vehicles, including the BMW in the video above.

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