Replacing control unit (DME) (B48) (330i xDrive Wagon, 330i GT xDrive)

Attention  !

Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) .

Necessary preliminary work: 

• Disconnect BATTERY NEGATIVE CABLE .
• Remove ACOUSTIC COVER .

Attention  !

Follow instructions for REMOVING AND INSTALLING CONTROL UNITS .

The fault memory must be read out using the diagnosis system, and a fault memory printout made.

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 instruction).

Removal: 

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Remove cover (1).

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Unlock and disconnect plugs (1).

Unlock and disconnect plugs (2).

Loosen the wiring harness from the holder (3) and put to one side.

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Unlock and loosen all connectors (1).

Unlock and loosen all connectors (1) in the direction of the arrow.

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Unlock and loosen the locks along the arrow.

Remove the Digital Motor Electronics control unit (1).

Installation: 

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Insert and install the Digital Motor Electronics control unit (1).

The locks must engage audibly along the arrow.

Connect and lock all connectors (1) along the arrows.

All connectors (1) must engage audibly.

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Connect and lock all connectors (1).

All connectors (1) must engage audibly.

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Connect connector (2) and lock.

Attach and lock connector (1).

All connectors must audibly engage.

Insert and secure the wiring harness to the holder (3).

Install cover (1).

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Required follow-up work: 

• Connect BATTERY EARTH LEAD .
• Install ACOUSTIC COVER .

Attention  !

If the DME control unit has been replaced, it will also be necessary to reset the minimum quantity adjustment of the injectors  !

Reset ultra-small quantity adaptation: 

• Connect diagnosis system and follow diagnosis instructions
  • Read out vehicle data
  • Identification without vehicle test
  • Start vehicle test
  • Vehicle handling
  • Service functions
  • Power train
  • Engine electronics
  • Adjustment functions
  • Delete adaptations
  • Reset adaptation values
  • Resetting minimum quantity adaptations