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27 10 730 Replacing Transfer Box Control Unit (Longitudinal Torque Module) (ATC 450)

Special tools required:

IMPORTANT: Before and after replacement, execute the "Repair" service function with the BMW diagnosis system.
READ AND COMPLY WITH NOTES ON PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) .

Necessary preliminary tasks:

Disconnect NEGATIVE BATTERY CABLE .
Remove CROSS MEMBER .

Disconnect connector (1).

Release screws (2) and remove transfer box from control unit (longitudinal torque module) (3).

Tightening torque: 27 00 13AZ .

NOTE: Radial shaft seal of actuator shaft must be replaced as well.

Fig 1: Transfer Box From Control Unit (Longitudinal Torque Module), Connector, Screws

G09921697

Courtesy of BMW OF NORTH AMERICA, INC.

Thread special tool 23 0 490 into radial shaft seal (1).

Drive out radial shaft seal (1) with impact weight (2).

Fig 2: Pulling Out Radial Shaft Seal With Impact Weight

G08504531

Courtesy of BMW OF NORTH AMERICA, INC.

Push the assembly sleeve 11 1 380 over the actuator shaft.

IMPORTANT: Nonobservance involves a risk of damage to the radial shaft seal.

Fig 3: Pushing Assembly Sleeve 11 1 380 Over Actuator Shaft

G08504532

Courtesy of BMW OF NORTH AMERICA, INC.

Slide the new radial shaft seal (1) over the assembly sleeve (2) onto the actuator shaft.

Fig 4: Sliding Radial Shaft Seal Over Assembly Sleeve Onto Actuator Shaft

G08504533

Courtesy of BMW OF NORTH AMERICA, INC.

Drive radial shaft seal fully home using special tool 11 1 200 and plastic hammer.

Remove the assembly sleeve.

Fig 5: Pulling Radial Shaft Seal Using Special Tool 11 1 200 And Plastic Hammer

G08504534

Courtesy of BMW OF NORTH AMERICA, INC.

After replacement:

CARRY out programming/encoding.