34 52 516 Removing and installing/replacing DSC control unit

IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DAMAGE (ESD PROTECTION) .

Necessary preliminary tasks:

Remove hydraulic unit. See REMOVING AND INSTALLING/REPLACING HYDRAULIC UNIT FOR DSC (UNTIL PRODUCTION 07/2010) or REMOVING AND INSTALLING/REPLACING HYDRAULIC UNIT FOR ASC+T .

IMPORTANT: Removing pump motor from valve block is not permitted.

Seal line connections with plugs (1) from control unit repair kit.

Clean control unit.

Fig 1: Sealing-Off Line Connections Using Plugs From Control Unit Repair Kit

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

IMPORTANT: Control unit must not come into contact with dirt or moisture.

Carefully pull off control unit (2) without tilting.

Installation:

Replace screws.

Tighten in diagonal sequence in increments of 1 Nm

Tightening torque 34 51 7AZ .

Fig 2: Pulling Off Control Unit

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Do not touch plug-in contacts (1) and sealing surface (2) with your fingers.
The seal for the electronic control unit deforms during fitting and thereby achieves its maximum sealing effect. The control unit must therefore not be removed again after installation or used a second time.
In the event of visible damage, the hydraulic control unit is can no longer be used.

Clean sealing surface (2) of hydraulic control unit with fluff-free cloth (do not use hard or sharp objects).

Fig 3: Identifying Sealing Surface And Plug-In Contacts