LEMON Manuals: Even more car manuals for everyone
Home >> BMW >> 2021 >> M3 Base, Standard Trans >> Repair and Diagnosis >> Electrical >> Charging Systems >> Engine Electrical System -- Repair M3 (G80) >> 12 90 ECM Housing >> 12 90 150 Remove and install/replace control unit box (M3 base, M3 Competition, M3 Competition M xDrive, M3 CS) >> 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 

G14902325Courtesy of BMW OF NORTH AMERICA, INC.
G14902481Courtesy of BMW OF NORTH AMERICA, INC.