12 21 520 Replacing preheating control unit (N47D20 O1)

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Necessary preliminary tasks:

Switch off ignition.
Remove INTAKE SILENCER HOUSING .

Release positive battery cable (1) from clamp.

Release expanding rivets (2).

Remove rear acoustic cover (3).

Fig 1: Identifying Positive Battery Cable, Expanding Rivets And Rear Acoustic Cover

Courtesy of BMW OF NORTH AMERICA, INC.

Detach connector (1) from preheating control unit.

Release screw (2).

Tightening torque 12 23 2AZ .

Remove preheating control unit (3).

Fig 2: Identifying Connector, Preheating Control Unit And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: If the preheating control unit is replaced, the preheating control service function must be performed using the diagnosis system after it is replaced.

Installation note:

Assemble engine.