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Home >> BMW >> 2005 >> 330xi Standard >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Gauges & Instrument Panels >> Engine Electrical System - Repair >> Electronic Switching >> 12 63 520 Replacing main relay

12 63 520 Replacing main relay

Switch off ignition.

Connect DIS Tester.

Release screws (1).

Remove electronics box cover.

Fig 1: Releasing Screws Of Electronics Box Cover
G03123595Courtesy 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: Installing Cover Into Hinges Of Underside Of Electronics Box
G03123596Courtesy of BMW OF NORTH AMERICA, INC.

Arrangement:

  1. Main relay of Digital Motor Electronics
  2. Engine fuses of Digital Motor Electronics
Fig 3: Identifying Engine Fuses Of Digital Motor Electronics
G03123597Courtesy 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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