12 63 520 Replacing main relay (S62, M54)

WARNING: This page is about a different car, the 2003 BMW 530i, 2002 BMW 530i, and 2001 BMW 530i. However, it is still accessible from the selected car via links, so may be relevant.

Switch off ignition.

Release retaining clips (1).

Fig 1: Removing Air Duct Retaining Clips

Courtesy of BMW OF NORTH AMERICA, INC.

CAUTION: The air duct can break at the firewall if not carefully removed and installed.

Carefully twist air duct (2) upwards until it is no longer locked in firewall. Pull air duct (2) forwards and lift out.

Open locking bracket (1). Open cover on microfilter housing (2) and unhook from hinges.

Open retaining clip (3).

Pull microfilter housing to right and lift out.

Fig 2: Removing Microfilter Housing & Microfilter

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Hook cover of filter housing into hinges in correct position.

Incorrect installation leads to sealing problems.

Release screws (1).

Tightening torque, refer to 12 90 4AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Remove cover (2) from electronics box.

Fig 3: Removing Cover From Electronics Box

Courtesy of BMW OF NORTH AMERICA, INC.

Arrangement:

Main relay of Digital Motor Electronics
Engine fuses for Digital Motor Electronics

Fig 4: Identifying Main Relay For Digital Motor Electronics

Courtesy of BMW OF NORTH AMERICA, INC.

If the starter turns during the engine starting sequence but the engine fails to start:

Check engine fuses.
If fuses are blown, replace them completely with fuse holder.
Find out why fuses have blown.

Additional troubleshooting as per DIS instructions.