12 90... Removing And Installing/Replacing Electronics Box

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Read and comply with notes on protection against electrostatic damage (ESD protection) . See 61 35... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE) (CONVERTIBLE) or 61 35... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE) (COUPE) .

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 (CONVERTIBLE) or 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD (COUPE) .
Remove microfilter housing . See 64 31 081 REMOVING AND INSTALLING/REPLACING MICROFILTER HOUSING (UPPER SECTION) and 64 31 092 REMOVING AND INSTALLING/REPLACING MICROFILTER HOUSING (LOWER SECTION) .
Remove tension strut on spring strut dome on right. See 31 12 080 REMOVING AND INSTALLING/REPLACING BOTH TENSION STRUTS .

Release screws (1).

Slacken nut (2).

Lift out right heater end plate (3).

Installation:

Ensure gasket (4) is correctly seated.

Fig 1: Identifying Right Heater End Plate & Screws

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: Identifying Fasteners & 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

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 Out Of Housing

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: Pulling Contact Carrier Out Of Housing

G04748631

Courtesy of BMW OF NORTH AMERICA, INC.

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

Remove DME control unit (3).

Fig 7: Identifying DME Control Unit

G05758808

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 8: Identifying Device Holder

G04751303

Courtesy of BMW OF NORTH AMERICA, INC.

Remove device holder (1) from electronics box.

Fig 9: Identifying Device Holder In 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 & Bump Stop

G05758811

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

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

Fig 11: Identifying Gasket

G04740388

Courtesy of BMW OF NORTH AMERICA, INC.