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Home >> BMW >> 2021 >> 430i 2D Convertible >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Electric Motor Systems >> Engine Electrical System -- Repair (G22, G23 & G26) (2 Of 2) >> 12 90 ECM Housing >> 12 90 150 Remove and install/replace control unit box (M440i and M440i xDrive coupe/convertible/Gran Coupe sedan) >> Removing the control unit holder

Removing the control unit holder

WARNING: Working on 12 V electrical system. 
Risk of short circuits! Risk of fire! 
  • Make sure that there is no charger  connected to the jump start terminal in the engine compartment.
  • Detach battery ground lead from battery.
  • For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.
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. Do not pry off using a tool.

Preliminary work 

G14632074Courtesy of BMW OF NORTH AMERICA, INC.