12 42 530 Replacing battery positive lead (between starter motor and alternator) (M54/M56)

Read fault memory. Switch off ignition.

Observe safety instructions for handling vehicle battery, refer to 61 00... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY .

Remove front underbody protection.

Follow instructions for disconnecting and connecting battery, refer to 12 00... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .

Disconnect battery negative lead from battery and lay to one side.

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.

Fig 1: Disconnecting Battery Positive Lead From Alternator

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

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

Release screw connection of battery positive lead (1) (floorpan).

Release nut on starter motor (3).

Installation: 

Tightening torque, refer to 12 41 4AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Detach battery positive lead (1) from holder (2).

Fig 2: Detaching Battery Positive Lead From Holder

Courtesy of BMW OF NORTH AMERICA, INC.

• Read out fault memory of DME control unit
• Check stored faults
• Rectify faults
• Clear fault memory