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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). See 61 35... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE) .

NOTE: Follow instructions for removing and installing electronic control units

Necessary preliminary tasks:

Read fault memory.
Disconnect negative battery cable . See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .
Remove microfilter housing . See MICROFILTER .
Remove tension strut on spring strut dome on right. See 51 71 371 REMOVING AND INSTALLING/REPLACING TENSION STRUT ON LEFT OR RIGHT SPRING STRUT DOME (CONVERTIBLE) or 51 71 371 REMOVING AND INSTALLING/REPLACING TENSION STRUT ON LEFT OR RIGHT SPRING STRUT DOME (COUPE) .

Release screws (1).

Slacken nut (2).

Lift out right heater end plate (3).

Installation:

Ensure gasket (4) is correctly seated.

Fig 1: Lifting Out Right Heater End Plate

G04751296

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: Unlocking Locks

G04751288

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 Wiring Harness Grommets And Electronics Box

G04751298

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: Pulling Tab

G04751299

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: Pressing Locking Tabs

G04751300

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: Pressing Locking Tab

G04748631

Courtesy of BMW OF NORTH AMERICA, INC.

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

Remove DME control unit (3).

Fig 7: Removing DME Control Unit

G04751302

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 8: Identifying Device Holder And Holder

G04751303

Courtesy of BMW OF NORTH AMERICA, INC.

Remove device holder (1) from electronics box.

Fig 9: Identifying Device Holder On Electronics Box

G04751304

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 And Bump Stop

G04751305

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

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

Fig 11: Identifying Gasket On Electronics Box

G04740388

Courtesy of BMW OF NORTH AMERICA, INC.