12 90... Removing and installing/replacing electronics box

IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) .

NOTE: Follow instructions for REMOVING AND INSTALLING ELECTRONIC CONTROL UNITS .

Necessary preliminary tasks

Read out fault memory.
Disconnect BATTERY EARTH CABLE .
Remove MICROFILTER HOUSING .
Remove TENSION STRUT ON SPRING STRUT DOME on right.

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

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

Unlock locks (2) in direction of arrow.

Remove cover (3).

Fig 2: Identifying Electronics Box Cover Fasteners With Locks

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Disconnect plug connection (1).

Unlock plug connection (2) in direction of arrow and disconnect.

Pull wiring harness grommet (5) out of electronics box and remove wiring harness (4).

Pull wiring harness grommet (3) out of electronics box and remove wiring harness with equipment carrier (6).

Installation:

Make sure wiring harness grommets (3, 5) are correctly seated in electronics box.

Fig 3: Pulling Wiring Harness Grommet Out Of Electronics Box

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

Fig 4: Pulling Contact Carrier Out Of Housing

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

Fig 5: Pulling Contact Carrier Out Of Housing

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Release screws (1).

Replacement

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

Fig 6: Identifying Water Drain Valve, Bump Stop And Screws

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Installation:

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

Fig 7: Identifying Electronics Box Gasket

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) .

NOTE: Follow instructions for REMOVING AND INSTALLING ELECTRONIC CONTROL UNITS .

Necessary preliminary tasks

Read out fault memory.
Disconnect BATTERY EARTH LEAD .
Remove MICROFILTER HOUSING .
Remove trailing link on spring strut dome . See 51 71 371 REMOVING AND INSTALLING/REPLACING TRAILING LINK ON LEFT OR RIGHT SPRING STRUT DOME or 51 71 345 REMOVING AND INSTALLING/REPLACING LEFT (OR RIGHT) SUSPENSION CROSS-BRACE on right.

Release screws (1).

Slacken nut (2).

Lift out right heater end panel (3).

Installation note:

Ensure gasket (4) is correctly seated.

Fig 1: Lifting Out Right Heater End Plate

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 Electronics Box Cover Fasteners With Locks

Courtesy of BMW OF NORTH AMERICA, INC.

Release plug connection (2), fuse carrier (3) and wiring harness grommet (4) from electronics box (1) in upward direction.

Installation note:

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

Fig 3: Identifying Plug Connection, Fuse Carrier, Wiring Harness Grommet

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Unlock DME control unit from holder (1) and raise slightly.

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

Fig 4: Disconnecting Plug Connections From DME Control Unit

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

Fig 5: Pulling Contact Carrier Out Of Housing

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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

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Unlock equipment holder (2) on holder (1) and remove.

Remove DME control unit (3).

Fig 7: Removing DME Control Unit

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Unlock equipment holder (2) on holder (1) and remove.

Fig 8: Identifying Equipment Holder On Holder

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Remove equipment holder (1) from electronics box.

Fig 9: Identifying Equipment Holder On Electronics Box

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Release screws (1).

Replacement

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

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

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

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

Fig 11: Identifying Electronics Box Gasket

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