Replacing the battery ground lead

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2023 BMW M5, 2022 BMW M5, 2021 BMW M5, 2020 BMW M5, and 2019 BMW M5. However, it is still accessible from the selected car via links, so may be relevant.

Preliminary work

Refer to REMOVING THE LUGGAGE COMPARTMENT FLOOR COVERING .

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.

Slacken nut (1).
Unlock and disconnect plug connection (2) to the intelligent battery sensor (IBS).
Loosen nut (3).
Detach the battery ground lead (4) from the negative battery terminal and remove it.
Tighten the negative battery cable (4) using the nut (3).
Connect and lock the connector (2) to the intelligent battery sensor (IBS).
Connect the negative battery terminal to the negative battery terminal.
Tighten nut (1).

TIGHTENING TORQUES SPECIFICATION

Negative battery terminal
Nut	tightening torque	5 Nm

Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work

Refer to INSTALLING THE LUGGAGE COMPARTMENT FLOOR COVERING .