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.
Remove front underbody protection.
Observe 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 REMOVE AND INSTALLING INTAKE FILTER HOUSING (M52TU, M54) .
Release nut and disconnect battery positive lead (2) from alternator.
Installation:
Tightening torque, refer to 12 31 1AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES - 325I, CI & XI - E46 .
If Fitted:
Remove vacuum reservoir for exhaust flap.
Unscrew nut (1).
Installation:
Tightening torque, refer to 12 41 4AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES - 325I, CI & XI - E46 .
Disconnect battery positive lead (2) from starter motor.
Remove battery positive lead.
E39 only:
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 - 325I, CI & XI - E46 .
Detach battery positive lead (1) from holder (2).
- Read out fault memory of DME control unit.
- Check stored faults.
- Rectify faults.
- Clear fault memory.