12 42 500 Replacing battery positive lead (between starter, alternator and battery positive terminal)

Necessary preliminary tasks:

Read out fault memory of DME control unit
Switch off ignition
DISCONNECT BATTERY NEGATIVE LEAD
REMOVE SOUND GENERATOR
REMOVE LOCK BRIDGE
Disconnect battery positive lead from battery positive terminal. Tightening torque 61 21 1AZ .
Unlock plug on bulkhead and disconnect

Release clamps (1) and detach air intake hose (2).

Fig 1: Identifying Air Intake Hose And Clamps

G04790022

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and remove.

Release nut and disconnect battery positive lead (2).

Tightening torque 12 41 2AZ .

Fig 2: Identifying Battery Positive Lead, Plug, And Nut

G04796451

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw and remove holder (1).

Fig 3: Identifying Screw And Holder

G04790017

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and remove.

Release nut and disconnect battery positive lead (2).

Tightening torque 12 31 2AZ .

Fig 4: Identifying Battery Positive Lead, Plug, And Nut

G04796452

Courtesy of BMW OF NORTH AMERICA, INC.

Release bolts.

Tightening torque 12 51 3AZ .

Feed out air wiring harness (1) and remove.

Fig 5: Identifying Air Wiring Harness And Bolts

G04796453

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check stored fault messages.
Now clear the fault memory.