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Home >> BMW >> 2018 >> M4 2D Convertible, Automatic DCT Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Memory Modules >> General Electrical System - Repair -- M4 (F82 & F83) >> 61 20 Battery >> Disconnecting and connecting battery earth lead >> REP-TAT-P-6120-01 Disconnecting the negative battery cable of the system battery

REP-TAT-P-6120-01 Disconnecting the negative battery cable of the system battery

Necessary preliminary work: 

Remove right luggage compartment trim panel. Refer to REMOVING AND INSTALLING/REPLACING RIGHT LUGGAGE COMPARTMENT WHEEL ARCH PANEL or REMOVING AND INSTALLING/REPLACING LUGGAGE COMPARTMENT TRIM PANEL ON SIDE WALL, RIGHT (M4 CONVERTIBLE) .

Prerequisite 

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: TECHNICAL INFORMATION 
Follow NOTES ON THE LITHIUM ION BATTERY .
G10098407Courtesy of BMW OF NORTH AMERICA, INC.