Disconnecting the negative battery cable of the system battery

Preliminary work

Refer to REMOVING REAR HOOD SEAL .
Refer to REMOVING FRONT WINDSHIELD PANEL COVER .

Precondition

Ignition is switched off.

WARNING: Deactivate the 12-V electrical system.
Risk of short circuits! Risk of fire!

Make sure that there is no battery charger connected to the jump start terminal in the engine compartment.
For vehicles with additional electrical systems (48 V electrical system, high-voltage vehicle electrical system), this absolutely must be deactivated before the vehicle battery is disconnected.

Unlock plug connection (1) and disconnect.
Loosen nut (2).

NOTE: RISK OF DAMAGE
Damage to battery terminal, the safety battery terminal or the intelligent battery sensor (IBS).
Damaged battery terminals can lead to malfunctions or vehicle electrical system faults.

Detach battery terminal from battery pole by carefully shifting to and fro. Do not pry off using a tool.

Courtesy of BMW OF NORTH AMERICA, INC.

Pull off the negative battery cable of the system battery (3) from the negative battery terminal, set aside and secure.