12 63 520 Replacing DME master relay

Necessary preliminary tasks: 

• Switch off ignition
• Connect DIS Tester

Release screws (1).

Installation: 

Tightening torque 12 90 4AZ .

Remove cover (1).

Arrangement:

1. DME master relay
   Fig 2: Identifying DME Master Relay

   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:

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.