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Home >> BMW >> 2017 >> 530i >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Engine Electrical System - Repair (G30) (4 Of 5) >> 12 51 Engine Wiring Harness >> 12 51 245 Remove and install/replace transmission module engine wiring harness (540i xDrive 2017-2020) >> 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 by carefully shifting to and fro. Do not pry off using a tool.

Preliminary work 

Removing the wiring harness section of the right transmission wiring harness 

Wiring harness section of the transmission wiring harness, right 

G14232298Courtesy of BMW OF NORTH AMERICA, INC.
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.

Removing the wiring harness section of the left transmission wiring harness 

Wiring harness section of the transmission wiring harness, left 

G14232300Courtesy of BMW OF NORTH AMERICA, INC.
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.