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Home >> BMW >> 2006 >> X3 Standard >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Engine Electrical System - Repair (M54) >> Engine Control Unit Box >> 12 90... Removing and installing/replacing electronics box
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12 90... Removing and installing/replacing electronics box

IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DAMAGE (ESD PROTECTION) .
NOTE: Follow instructions for REMOVING AND INSTALLING ELECTRONIC CONTROL UNITS 

Necessary preliminary tasks: 

Unlock DME control unit and remove.

Slacken If fitted, disconnect plug-in contact for electronics box fan.

Unlock equipment carrier at holder and remove.

Fig 1: Identifying DME Control Unit
G00554409Courtesy of BMW OF NORTH AMERICA, INC.

Cut open cable tie (1). Release screws.

Remove rear plate.

Fig 2: Identifying Cable Tie And Screws
G00554410Courtesy of BMW OF NORTH AMERICA, INC.

Version with electronics box fan.

Detach cable tie. Release screws.

Remove rear plate with fan.

Fig 3: Locating Engine Control Unit Fan, Cable Tie, And Screws
G04748574Courtesy of BMW OF NORTH AMERICA, INC.

Release screws for electronics box.

Fourth screw is hidden by carpet.

Add final details to vehicle.

Read fault memory.

Fig 4: Locating Screws For Engine Control Unit
G00554411Courtesy of BMW OF NORTH AMERICA, INC.