Notes for disconnecting and connecting the vehicle battery (530i 2017-2022, 530i xDrive 2017-2022, 530e PHEV 2018-2022, 530e xDrive PHEV 2018-2022, 540i 2017-2022, 540i xDrive 2017-2022, M550i xDrive 2018-2022)

Observe SAFETY INSTRUCTIONS safety informations for handling vehicle battery.

Before disconnecting vehicle battery:

Turn off the ignition and other electrical consumers/consumers to prevent sparking when reconnecting.

NOTE: If the ignition is not switched off when the vehicle battery is disconnected, fault memories may be set in some control units.

CAUTION:

There is a danger of mixing up battery cables: if the positive battery cable and battery earth lead are the same color and you are in doubt, follow the polarity to the vehicle battery, then mark and cover the leads
The on-board computer and clock may lose your data.

General notes on disconnecting the vehicle battery:

Do not disconnect battery leads and leads from alternator and starter motor while engine is running.
Disconnect terminal of battery earth lead from the battery. Cover battery negative terminal(s) and secure.
Disconnect both battery earth leads in version with auxiliary battery. Cover battery negative terminal(s) and secure.
When work is carried out on the electrical system, faults may be caused in the fault memories of some control units when the vehicle battery is connected.

Only lead AGM battery:

On vehicles with IBS at negative battery terminal:
Do not under any circumstances pull/lever off pole shoes by force.

Do not under any circumstances release the hexagon socket screw of the IBS.

Note the following after having connected the vehicle battery:

CAUTION: The scope of application of some systems may be restricted after an open circuit.

Personal Profiles may also be lost.

Settings or activations must be carried out, depending on the equipment specification.

For example:

Refer to the diagnosis system using an appropriate scan tool for further vehicle-specific information.