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Home >> BMW >> 2019 >> Z4 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Engine Electrical System -- Repair (G29) >> 12 90 ECM Housing >> 12 90 150 Remove and install/replace control unit box >> Remove control unit bracket

Remove control unit bracket

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