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Home >> BMW >> 2021 >> X3 M Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Electrical System -- Repair -- X3 M (F97) >> 12 51 Engine Wiring Harness >> 2 51 235 Remove and install/replace Module 1, sensor system engine wiring (X3 M) >> Removing the engine wiring harness for sensor system

Removing the engine wiring harness for sensor system

WARNING: Hot surfaces  .
Risk of burning! 
  • Perform all work only on components that have cooled down.
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 

Engine wiring harness for sensor system 

G14927441Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: RISK OF DAMAGE 
Electrostatic discharge  .
Damage to or destruction of electrical components  .
  • Leave the electrical components in their original packaging until they are being installed. Only use the original packaging for returning the product. Always package removed components straight away.
  • Read and comply with user information on using the associated special tool 12 7 060.
  • Only tap the housings of electrical components. Do not tap pins or multi-pin connectors directly.
  • Wear electrically conductive clothing and antistatic shoes (with ESD symbol).
  • For additional information see: 61 35... NOTES ON ELECTROSTATIC DISCHARGE (ESD) PROTECTION .
NOTE: RISK OF DAMAGE 
Damage to wires when disconnecting connectors and plug connections. Sheared wires can cause a short circuit  .
  • Do not pull on wires when disconnecting connectors and plug connections.