12 63 520 Replacing main relay (M62, M54)

WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, 2001 BMW X5, and 2000 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

Switch off ignition.

Connect DIS Tester.

Detach sealing strips (1).

Fig 1: Removing Sealing Strips

G03252284

Courtesy of BMW OF NORTH AMERICA, INC.

Turn bar through approx. 90°.

Remove cover.

Fig 2: Removing Cover

G03252285

Courtesy of BMW OF NORTH AMERICA, INC.

Release lock (1).

Remove air funnel (2) towards top.

Fig 3: Removing Air Funnel Towards Top

G03252286

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws.

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

Remove cover (1) on control unit box.

Fig 4: Removing Cover On Control Unit Box

G03252287

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Insert fixtures (1) of cover for control unit box in openings (2).

Fig 5: Inserting Fixtures Of Cover For Control Unit Box In Openings

G03252288

Courtesy of BMW OF NORTH AMERICA, INC.

Order:

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

Fig 6: Identifying Digital Motor Electronics
Courtesy of BMW OF NORTH AMERICA, INC.

Notes on troubleshooting:

If the starter motor cranks the engine during the starting sequence but the engine fails to fire, then:

Check engine fuses
If fuses are blown, replace them completely with fuse holder
Find out why fuses have blown
Continue troubleshooting as per DIS instructions.