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HOMESERVICE MANUALSBMW2013128I 2D CONVERTIBLE, ENG CD N52, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 460 (ENGINE ELECTRICAL SYSTEM - REPAIR)ELECTRONIC SWITCHING OR CONTROL UNIT12 63 520 REPLACING MAIN RELAY
2013 BMW 128i 2D Convertible, Eng CD N52, Standard Trans

12 63 520 Replacing Main Relay

2013 BMW 128i 2D Convertible, Eng CD N52, Standard TransSECTION 12 63 520 Replacing Main Relay
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW M3, 2005 BMW M3, 2004 BMW M3, 2003 BMW M3, and 2002 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

Switch off ignition.

Connect DIS Tester.

Release screws (1).

Remove electronics box cover.

Fig 1: Identifying Electronics Box Cover
G03118137Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Correctly install wiring harness with grommet in electronics box cover (water tightness).

Hook cover (3) into hinges of underside of electronics box (1). Then correctly install upper stop (2) above hinges on underside of electronics box.

Fig 2: Locating Hinges Of Underside Of Electronics Box
G03118138Courtesy of BMW OF NORTH AMERICA, INC.

Arrangement:

  1. Main relay of Digital Motor Electronics.
  2. Engine fuses of Digital Motor Electronics.
Fig 3: Identifying Main Relay And Engine Fuses Of DME
G03118139Courtesy 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.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.