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 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: Opening Locks

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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

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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 DME Control Unit Tabs

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

Fig 5: Pressing Carrier Locking Tabs

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

Fig 6: Pressing Carrier Locking Tabs

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

Remove DME control unit (3).

Fig 7: Identifying DME Control Unit With Holders

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

Fig 8: Identifying DME Control Unit Holders

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Remove device holder (1) from electronics box.

Fig 9: Identifying DME Control Unit Holder

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Release screws (1).

Replacement

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

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

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Installation:

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

Fig 11: Identifying Electronics Box Gasket

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