Detaching the negative battery cable of the vehicle electrical system support battery

Loosen the nut on the negative battery terminal (1).
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.
Detach the negative battery terminal (2) from the negative battery terminal.
Put the battery ground lead to one side and secure it.