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. See 61 00... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY
Remove front underbody protection.
Observe instructions for disconnecting and connecting battery. See 12 00... Instructions for disconnecting and connecting battery
Disconnect battery negative lead from battery and lay to one side.
Remove suction filter housing. See 13 71 000 REMOVE AND INSTALLING INTAKE FILTER HOUSING (M52TU, M54)
Release nut and disconnect battery positive lead (2) from alternator.
Installation:
E46 only:
Remove reinforcement plate on front axle support. See 51 71 374 REMOVING AND INSTALLING/REPLACING REINFORCEMENT PLATE ON FRONT AXLE SUPPORT
If fitted:
Remove vacuum reservoir for exhaust flap. See 18 10 020 REMOVING AND INSTALLING/REPLACING VACUUM TANK FOR EXHAUST FLAP
Unscrew nut (1).
Installation:
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:
Detach battery positive lead (1) from holder (2).
- Read out fault memory of DME control unit
- Check stored faults
- Rectify faults
- Clear fault memory