34 52 515 Replacing ABS/ASC+T/DSC control module from 09/98: Installation:

Position plug connection (1) vertically on control module in order to avoid damaging pins.

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

Fig 1: Detaching Control Module From Hydraulic Unit

Replace screws (1).

Check sealing face (1) for damage (visual inspection).

Clean sealing face (1); do not use any sharp-edged tools or aggressive cleaning agents here.

Check contact lugs (2) for corrosion or damage.

Replace hydraulic unit if sealing surface (1) or contact lugs (2) is/are damaged.

Fig 1: Identifying Sealing Face And Contact Lugs

Carefully push control module (1) onto hydraulic unit (2). Make sure that solenoid coils do not tilt.

Fig 2: Pushing Control Module Onto Hydraulic Unit

Housing edge of control module (1) must slide over extension on hydraulic unit (2).

Fig 3: Identifying Housing Edge Of Control Module

Press control module onto hydraulic unit and screw in screws (1+2) evenly (do not tighten down) until control module is resting evenly on hydraulic unit.

Insert screws (1-6), do not tighten down yet.

Tighten down screws (1-6) in specified sequence with torque wrench.

Use only new screws, observe tightening torque, refer to 34 51 1AZ 34 51 SLIP CONTROL SYSTEM (ABS, ASC+T, DSC) .

Fig 1: Identifying Screws