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Home >> BMW >> 2021 >> X3 M Base >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> General Electrical System -- Repair -- X3 M (F97) >> 61 20 Battery >> 61 20 900 Disconnecting and connecting battery ground lead (X3 M) >> Disconnecting the negative battery cable of the system battery

Disconnecting the negative battery cable of the system battery

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.
NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details.
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.
G12673376Courtesy of BMW OF NORTH AMERICA, INC.