Replacing Control Unit

Note:
Read and comply with General Information.
Before removing DSC control unit, read out control unit fault memory and if necessary, print out diagnostic trouble code.

Installation:
On completion, carry out following tasks with the DIS ( Diagnosis and Information System ):
- Coding for new control unit
- Adjustment of steering angle sensor
- End-of-tape test for new control unit
Bleeding braking system





Unfasten plug connection lock (1) in direction (2). Detach plug connection (1) in direction (3) vertically towards top.
Installation: Position plug connection (1) vertically on control unit so as to avoid damaging pins.





Release screws (1) and detach control unit (2) from hydraulic unit.





Check sealing surface (1) for damage (visual inspection).
Clean sealing surface (1); do not use any sharp-edged tools or aggressive cleaning agents for this purpose.
Check contact lugs (2) for corrosion or damage.
Installation: Replace hydraulic unit if damage to sealing surface (1) or contact lugs (2) is found.





Carefully push control unit (1) onto hydraulic unit (2). Make sure solenoid coils are not tilted.





Housing edge of control unit (1) must slip over shoulder on hydraulic unit (2).





Press control unit onto hydraulic unit and install screws (1) + (2) uniformly (do not tighten down) until control unit rests evenly on hydraulic unit.
Install screws (1) - (6), do not tighten down.
Tighten down screws (1) - (6) in specified sequence with a torque wrench.
Installation:
Use new screws.
Control unit on hydraulic unit
E46 (MK20) 2.6 Nm
E46 (MK60) 5 Nm
(4WD) 2.9 Nm