Removal and installation of the electronic control unit of the ABS / ASC+T / DSC systems (BMW 7 Series E38)

1. Turn off the ignition.

ABS control unit (models up to 09.1998.)

1. Remove the lower section of the glove box trim.



2. Loosen the mounting bolts, move the control unit down so that the electrical wiring connector of the unit can be disconnected and remove it.

ABS/ASC T/DSC control unit (models from 09.1998.)

After installing a new control unit, it must be programmed, and on models with the DSC system, the steering wheel position sensor must also be matched. A diagnostic scanner is required for these procedures.

1. Disconnect the connector (1) by sliding the lock in direction (2) and remove the connector by pulling it in direction (3) (vertically upwards).

When installing, to avoid damaging the contacts, insert the connector plug into the control unit, holding it strictly perpendicularly.

2. Remove the screws (1) and disconnect the electronic control unit (2) from the hydraulic modulator.

Please use new screws when installing.

3. Visually inspect the sealing surface of the hydraulic modulator for damage and clean it.

In this case, do not use tools with sharp edges or aggressive cleaning agents. Check the connector contacts for corrosion and damage. If defects are found in the sealing surface or contacts, replace the hydraulic modulator.

4. Carefully place the control unit on the hydraulic modulator, avoiding distortion of the excitation coils. The edge of the control unit housing should slide along the protrusion of the hydraulic modulator.

5. Press the control unit against the hydraulic modulator and screw in the mounting bolts (1 and 2), without tightening them until the control unit housing is evenly adjacent to the hydraulic modulator. Screw in bolts 1 through 6 until the contact surfaces are adjacent, and then with the required force in sequence from 1 through 6.