BMW Cars 1999-06

Digital Motor Electronics (DME) Control Unit

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Removal & Installation




CAUTION
Make sure that the ignition is switched off and no electrical equipment is on or running.

  1. Disconnect the battery-s negative cable.
  2.  
  3. Remove the right fresh-air duct.
  4.  
  5. There is a sliding -stopper- cover that needs to first be removed. Do so by sliding it the direction of the white arrow in the photo.

    Click image to see an enlarged view

    Fig. Slide the locking stopper the direction of the white arrow

  6.  
  7. Unscrew the retaining screws to the cover and lift it out. Some models are equipped with an armor plating that needs to be unscrewed as well.
  8.  
  9. Unlock (via small tabs) and detach all of the plug connections on the DME control unit (1).
  10.  
  11. Unlock the DME control unit (1) itself and remove out towards top.

    Click image to see an enlarged view

    Fig. Unlock the DME control unit (1) itself and remove out towards top

  12.  

To install:

  1. Slide the DME control unit back into the box.
  2.  
  3. Lock the small tabs and reconnect all of the plug connectors
  4.  
  5. Screw on the retaining screws of the cover
  6.  
  7. Slide the -stopper- cover back over the DME box
  8.  
  9. Replace the fresh air duct.
  10.  


CAUTION
Before you begin, always make sure to communicate with the fault memory with a BMW DIS (or equivalent OBD-II scan tool) for existing faults. It may be helpful to print out the results.


CAUTION
Make sure that the ignition is switched off and no electrical equipment is on or running.

  1. Unscrew the four bolts on the wire cover and fold it to one side. With it should come the wiring harness.
    NOTE
    The control units are located behind the battery holder in the engine compartment.



    Click image to see an enlarged view

    Fig. Unscrew the four bolts on the wire cover and fold it to one side

  2.  
  3. To disconnect the connector, lift the locking clamp on the plug-in connection. Pull it in an upwards direction.
  4.  
  5. Disconnect the connector.

    Click image to see an enlarged view

    Fig. Pull the connector in an upwards direction

  6.  
  7. Pull out the control unit from the clips. There are retaining screws on the clips and they do not need to be unscrewed).

    Click image to see an enlarged view

    Fig. In this area are both the control unit for the automatic transmission (1) and the control unit for the Digital Motor Electronics (DME)

  8.  

To install:

  1. When replacing a control unit, make sure that you have the exact part number and coding before making the connections.
  2.  
  3. Access the fault memory of control unit of Digital Motor Electronics (DME), check for any stored fault messages, rectify those faults and clear the fault memory.
  4.  
  5. The plug-in connection (1) must be inserted when the catalytic converter is removed. After which, the DME control unit then recognizes the output value of the idle speed potentiometer.

    Click image to see an enlarged view

    Fig. The plug-in connection (1) must be inserted when the catalytic converter is removed

  6.  

 
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