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Home >> BMW >> 2012 >> 328xi 4D Wagon, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Engine Electrical System - Repair - E91 >> 1290 Control Unit Box >> 12 90... Removing and installing/replacing electronics box >> Necessary preliminary tasks

Necessary preliminary tasks

Release screws (1).

Slacken nut (2).

Lift out right heater end plate (3).

Installation: 

Ensure gasket (4) is correctly seated.

Fig 1: Lifting Right Heater End Plate
G04751296Courtesy of BMW OF NORTH AMERICA, INC.

Unlock fasteners (1) from below and slide upwards approx. 10 mm.

Unlock locks (2) in direction of arrow.

Remove cover (3).

Fig 2: Unlocking Locks
G04751288Courtesy of BMW OF NORTH AMERICA, INC.

Lift out plug connection (2), fuse carrier (3) and wiring harness grommet (4) from electronics box (1).

Installation: 

Make sure wiring harness grommets (4) are correctly seated in electronics box (1).

Fig 3: Identifying Electronics Box With Plug Connection, Fuse Carrier And Wiring Harness Grommet
G04751298Courtesy of BMW OF NORTH AMERICA, INC.

Unlock DME control unit at holders (1) and raise slightly.

Pull tab (3) in direction of arrow out of housing and disconnect plug connections (2) on DME control unit.

Fig 4: Pulling Tab
G04751299Courtesy of BMW OF NORTH AMERICA, INC.

If necessary, press locking tabs (1) in direction of arrow and pull contact carrier (2) out of housing.

Fig 5: Pressing Locking Tabs
G04751300Courtesy of BMW OF NORTH AMERICA, INC.

If necessary, press locking tab (1) in direction of arrow and pull contact carrier (2) out of housing.

Fig 6: Pressing Locking Tab
G04748631Courtesy of BMW OF NORTH AMERICA, INC.

Unlock device holder (2) at holder (1) and remove.

Remove DME control unit (3).

Fig 7: Removing Device Holder
G04751302Courtesy of BMW OF NORTH AMERICA, INC.

Unlock device holder (2) at holder (1) and remove.

Fig 8: Identifying DME Control Unit Holders
G04751303Courtesy of BMW OF NORTH AMERICA, INC.

Remove device holder (1) from electronics box.

Fig 9: Identifying Electronics Box Holder
G04751304Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).