12 90 100 Replacing Fan For Electronics Box (N73)

Necessary preliminary tasks: 

Switch off ignition.

Follow instructions for disconnecting and connecting battery  . See 12 00 ... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY 

Disconnect battery.

Remove fresh air duct  . See 64 31 031 REMOVING AND INSTALLING/REPLACING LEFT OR RIGHT MICROFILTER AIR DUCT (AUTOMATIC A/C HIGH)

Release screw and remove holder (1).

Release screws and remove cover (2) from control unit box.

Fig 1: Identifying Holder, Cover & Releasing Screw On Seal

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Installation: 

Insert tabs (1) in openings (2) and close cover.

Fig 2: Identifying Tabs & Cover

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1 = Integrated supply module

2 and 3 = DME control unit

4 = Valvetronic control unit

5 and 6 = HDEV output stage (high-pressure fuel injector)

Unlock all plug connections of control units (1-6) and disconnect.

Remove all control units (1-6).

Unlock plug connection on fan for electronics box and detach.

Release both screws on control unit carrier and remove towards top.

Fig 3: Identifying DME Control Unit & Supply Module

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Unfasten screws.

Remove fan (1) for electronics box.

Fig 4: Identifying Fan

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Check stored fault messages.

Now clear the fault memory.