12 14 550 Replacing control unit (DME) (M52, M62, M54)

Follow instructions for removing and installing electronic control units, refer to REMOVING AND INSTALLING ELECTRONIC CONTROL UNITS .

Read fault memory.

Turn off ignition.

Before replacing the control unit, comply with the following instructions:

Open locking bracket (1). Open cover on filter and unhook from hinges.

Fig 1: Opening Cover Locking Bracket

Courtesy of BMW OF NORTH AMERICA, INC.

Detach rubber seal (2).

Installation:

Hook cover of filter housing into hinges in correct position.

Incorrect installation leads to sealing problems.

Remove retaining clip (3).

Lift out filter housing (4).

Fig 2: Removing Filter Housing Retaining Clip

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Release screws (1).

Fig 3: Removing E-Box Cover Screws

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From 10/2000:

NOTE: For purposes of clarity, locking clips (1) are shown with cover opened.
After releasing screws, unlock both locking clips (1) and remove cover.

Fig 4: Removing Locking Clips

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Control unit of Digital Motor Electronics:
Unlock plug connections and detach from DME control unit.

Remove DME control unit from retaining clips.
Control unit for automatic transmission

Fig 5: Identifying Automatic Transmission & DME Control Units
Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Interrogate fault memory of DME control unit.
Check stored fault messages.
Rectify faults.
Then clear fault memory.