12 42 530 Removing and installing/replacing battery positive lead (between starter motor and alternator) (M54)

WARNING: This page is about a different variant/trim than selected.

Necessary Preliminary Tasks:

Read out fault memory of DME control unit.
Switch off ignition.
Disconnect negative battery lead.
Observe instructions for disconnecting and connecting battery. Refer to 12 00... INSTRUCTIONS FOR DISCONNECTING ANDCONNECTING BATTERY .
Remove suction filter housing. Refer to 13 71 000 REMOVING AND INSTALLING INTAKE FILTER HOUSING (M54) .
Release nut and disconnect battery positive lead (2) from alternator.

Tightening torque, refer to 12 31 1AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Fig 1: Releasing Nut And Disconnecting Battery Positive Lead From Alternator
Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew nut (1).

Detach battery positive lead (2) from starter motor and remove.

Fig 2: Removing Battery Positive Lead From Starter Motor

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: For a better overview, this work step is shown from below. Carry out removal of battery positive lead from above.

NOTE: Interrogate fault memory of DME control unit.

Check stored fault messages.

Rectify faults.

Then clear fault memory.