BMW X3 Service & Repair Manual: Replacing transfer box control unit (longitudinal torque module) (atc 450)

Special tools required:

• 11 1 200
• 11 1 380
• 23 0 490

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).

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: Nonobservance 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.

After replacement: CARRY out programming/encoding.