Replace the longitudinal torque distribution control unit (AWD) (X2 xDrive 28i 2018-2023, X2 M35i 2019-2022)

• Individual data must be read out from the control unit before removal without fail and transmitted back to the new control unit after installation (individual data is unique taught data)

  Non-compliance leads to functional affects (positioning precision of the HoK) 

• ISTA/P -> LMV control unit exchange

Removal: 

Loosen screws (1).

Remove cross member (2) on rear axle support.

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Disconnect plug (2).

Loosen the connector (1) and loosen the cable (3) from the control unit holder.

Unfasten screws (4).

Remove control unit (5) together with bracket.

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Loosen screws (1).

Remove the longitudinal torque distribution control unit (2) from the bracket (3).

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Installation: 

Position the longitudinal torque distribution control unit (2) on the bracket (3).

• Ensure correct cable routing.

Tighten down screws (1).

Tightening torque 33 10 2AZ .

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Position control unit (5) with holder on rear axle differential.

Tighten down screws (4).

Tightening torque 33 10 3AZ .

Attach connector (2).

Secure the cable (3) to the control unit holder and connect the connector (1).

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Position cross member (2) on rear axle support.

• Ensure correct installation position: Arrow (3) on cross member points in direction of travel!

Replace screws (1).

Parts:  Screws

Tighten down screws (1).

Tightening torque 33 31 2AZ .

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PROGRAM/ENCODE THE CONTROL UNIT .

• Load the individual data from the previous control unit to the new control unit.