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

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 BMW 540i, 2002 BMW 540i, 2001 BMW 540i, 2000 BMW 540i, and 1999 BMW 540i. However, it is still accessible from the selected car via links, so may be relevant.

Follow instructions for removing and installing electronic control units.

Read fault memory.

Turn off ignition.

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

Code control unit.
Program control unit.

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

Detach rubber seal (2).

Installation

Hook cover of filter housing into hinges in correct position.

Incorrect installation leads to sealing problems.

Fig 1: Detaching Rubber Seal

G03152849

Courtesy of BMW OF NORTH AMERICA, INC.

Remove retaining clip (3).

Lift out filter housing (4).

Fig 2: Removing Filter Housing

G03152850

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque, see 12 90 4AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUE .

Fig 3: Releasing Screws Of Control Unit

G03152851

Courtesy of BMW OF NORTH AMERICA, INC.

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: Identifying Locking Clips

G03152852

Courtesy of BMW OF NORTH AMERICA, INC.

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 Control Unit Of Digital Motor Electronics

G03152853

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.