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Home >> BMW >> 2020 >> X3 xDrive30e >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Engine Electrical System -- Repair (2 Of 2) (G01) >> 12 51 Engine Wiring Harness >> 12 51 245 Remove and install/replace transmission module engine wiring (X3 sDrive 30i, 2018-2022) >> Removing the wiring harness section of the transmission wiring harness

Removing the wiring harness section of the transmission wiring harness

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 

Wiring harness section of transmission wiring harness 

G14311075Courtesy 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: NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE) .
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.
NOTE: RISK OF DAMAGE 
Disconnecting control units may cause fault code entries and functional limitations. Fault code entries must be read out and deleted if necessary.
  • Release the clamps (arrows) and set aside.
  • Loosen screws (1).
  • Unlock lock (2).
  • Remove wiring harness section (3) of the transmission wiring harness and set aside.
    G14192475Courtesy of BMW OF NORTH AMERICA, INC.
  • Unlock plug connection (1) and disconnect.
  • Loosen clamps (2).
G14239925Courtesy of BMW OF NORTH AMERICA, INC.

→ Slightly lower the transmission 

G14192477Courtesy of BMW OF NORTH AMERICA, INC.
G14192482Courtesy of BMW OF NORTH AMERICA, INC.