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Home >> BMW >> 2022 >> M4 Base, Automatic Trans >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Electric Motor Systems >> Engine Electrical System -- Repair M4 (G82 & G83) >> 12 90 E-Box >> 12 90 150 Remove and install/replace control unit box (M4 2021-2023) >> 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 by carefully shifting to and fro. Do not pry off using a tool.

Preliminary work 

G15297251Courtesy of BMW OF NORTH AMERICA, INC.