12 14 550 Replacing control unit (DME) (N63): Notes

Necessary preliminary tasks: 

• Switch off ignition.
• Disconnect BATTERY EARTH LEAD .
• Drain coolant for charge air cooler.
• Remove right INTAKE PIPE .
• Remove right TENSION STRUT

Replacement: 

• Carry out programming/encoding
• If no data can be read out from the previous control unit, carry out injection quantity compensation (description at end of instructions).

Switch off ignition.

Release screw (1).

Lay filler neck (2) for windscreen washer fluid to one side.

Fig 1: Identifying Screw And Filler Neck

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Release screws (1).

Tightening torque 12 90 2AZ .

Remove electronics box cover (2).

Fig 2: Identifying Electronics Box Cover And Screws

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Unlock all connectors (1) from control unit and disconnect.

Unclip grommet hold-down device (2) and remove.

Detach rubber grommets (3) from electronics box. Place wiring harnesses to the side.

Installation note: 

Make sure grommets are correctly seated (watertightness).

Fig 3: Identifying Rubber Grommets, Grommet Hold-Down Device And Connectors

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Release outer locks on electronics box at front and rear.

Remove cover (1) from control unit.

Fig 4: Identifying Control Unit Cover And Electronics Box Outer Locks

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Release screws (1).

Tightening torque 12 90 1AZ .

Unclip coolant lines at clamp (2) from electronics box.

Release the electronics box (3) from the spring strut but do not remove.

Fig 5: Identifying Electronics Box, Clamp And Screws

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Press in lock (2) and detach coolant line (1) from control unit.

Catch and dispose of escaping coolant.

Lift out control unit.

Fig 6: Detaching Coolant Line From Control Unit

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