34 52 516 Removing and installing / replacing DSC control unit

WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Read and comply with notes on protection against electrostatic damage (ESD protection), refer to 61 35 ... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE) .

Necessary preliminary tasks:

Before removal, read out the control unit fault memory and if necessary print out the diagnostic trouble code.

Installation:

When replacing the control unit, carry out the following tasks with the DIS (Diagnosis and Information System):

Vehicle coding (performed by the vehicle itself)
Adjustment of steering angle sensor (performed by the vehicle itself)
Adjustment of brake pressure sensor (performed by the vehicle itself)
Adjustment of lateral acceleration sensors (performed by the vehicle itself)
Function check, hydraulic unit

Unfasten plug connection (1).

Release screws (2) and carefully detach control unit (3) towards front.

IMPORTANT: Risk of damage to the contacts when removing and installing the hydraulic unit.

Fig 1: Detaching Control Unit

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Keep sealing faces clean.

Replace screws.

Observe tightening sequence (1-4).

Fig 2: Tightening Screws In Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

Tightening torque, refer to 34 51 1AZ in BRAKES - TIGHTENING TORQUES - 645CI .