Control Module: Service and Repair

27 10 730 Replacing transfer box control unit (longitudinal torque module) (ATC 350)

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 damage (ESD protection).





Necessary preliminary work:
^ Disconnect battery earth lead

^ Remove cross member.





Disconnect connector (1).

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

Tightening torque 27 10 3AZ.

Installation note:
Replace O-ring.

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





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

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





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

Important!
Non-observance involves a risk of damage to the radial shaft seal.





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





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

Remove the assembly sleeve.