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Home >> BMW >> 2002 >> X5 30i, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 28 (Engine Electrical System - Repair Instructions - X5 (4.6L)) >> Electronic switching >> 12 63 520 Replacing main relay (M62, M54)

12 63 520 Replacing main relay (M62, M54)

WARNING: This page is about a different variant/trim than selected.

Switch off ignition.

Connect DIS Tester.

Detach sealing strips (1).

Fig 1: Detaching Sealing Strips
G03255127Courtesy of BMW OF NORTH AMERICA, INC.

Turn tommy bar through approx. 90°.

Remove cover.

Fig 2: Removing Cover
G03255128Courtesy of BMW OF NORTH AMERICA, INC.

Release lock (1).

Remove air funnel (2) towards top.

Fig 3: Removing Air Funnel
G03255129Courtesy of BMW OF NORTH AMERICA, INC.

Release screws.

Tightening torque, refer to 12 90 4AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES - X5 4.6L .

Remove cover (1) on control unit box.

Fig 4: Removing Control Unit Box Cover
G03255130Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

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

Fig 5: Installing Cover For Control Unit Box
G03255131Courtesy of BMW OF NORTH AMERICA, INC.
Fig 6: Identifying Digital Motor Electronics Main Relay And Engine Fuses
G03255132Courtesy 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:

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

    Continue troubleshooting as per DIS instructions.

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