12 51 001 Replacing Wiring Harness Section For Engine (N62)

Necessary preliminary tasks: 

• Read out DME fault memory
• Disconnect battery negative lead
• ENGINE BONNET/HOOD in assembly position
• Remove FRESH AIR DUCT on right and if necessary on left
• Remove center of ASSEMBLY PARTITION WALL
• Remove intake air manifold
• Remove underbody protection at front/rear
• Remove REINFORCEMENT PLATE
• Remove ELECTRIC FAN with fan cowl
• Remove right exhaust manifold
• Remove STARTER MOTOR 
• Remove ALTERNATOR 

Release screws (2).

Detach electronics box cover (1) from fixture (3) in direction of arrow towards right.

Installation: 

Secure electronics box cover (1) in direction of arrow on left in fixture (3).

Fig 1: Detaching Electronics Box Cover From Fixture

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten following plug connections: 

Fig 2: Identifying Plug Connections (1 Of 4)

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten following plug connections: 

Fig 3: Identifying Plug Connections (2 Of 4)

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten following plug connections: 

Fig 4: Identifying Plug Connections (3 Of 4)

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten following plug connections: 

Fig 5: Identifying Plug Connections (4 Of 4)

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Fit profile seals correctly.

Check for water leaks.

Assemble engine.