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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:

Read fault memory.
Disconnect Negative Battery Cable
Remove Both Windscreen Wiper Arms
Remove Microfilter Housing
Remove Cowl Panel Cover
Remove Tension Strut On Spring Strut dome on right

Release screws (1).

Slacken nut (2).

Lift out right end panel (3).

Installation:

Ensure gasket (4) is correctly seated.

Fig 1: Identifying Electronics Box Release Screws, Nut, Panel And Gasket

G04725664

Courtesy 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: Identifying Wiring Harness Cover, Fasteners And Locks

G04725656

Courtesy 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, Plug Connection, Fuse Carrier And Wiring Harness Grommet

G04725666

Courtesy 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: Identifying DME Control Unit Holders, Tabs And Plug Connections

G04725667

Courtesy 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: Identifying Locking Tabs And Contact Carrier

G04725668

Courtesy 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: Identifying DME Control Unit Locking Tab And Contact Carrier

G04725669

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock control unit carrier (2) at holder (1) and remove.

Remove DME control unit (3).

Fig 7: Identifying DME Control Unit, Unit Carrier And Holder

G04725712

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock control unit carrier (2) at holder (1) and remove.

Fig 8: Identifying Holder And Control Unit Carrier

G04725671

Courtesy of BMW OF NORTH AMERICA, INC.

Remove control unit carrier (1) from electronics box.

Fig 9: Identifying Control Unit Carrier

G04725672

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Replacement:

Modify water drain valve (2) and bump stop (3).

Fig 10: Identifying Water Drain Valve, Mounting Screws And Bump Stop

G04725673

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Make sure gasket (1) is correctly seated on electronics box.

Fig 11: Identifying Electronics Box Gasket

G04725674

Courtesy of BMW OF NORTH AMERICA, INC.