12 90 100 Replacing Fan For Electronics Box (N62)

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 And Seal

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Installation: 

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

Fig 2: Identifying Tabs

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Unlock plug connections on Valvetronic control unit (1), DME control unit (2) and integrated supply module (3) and detach.

Remove Valvetronic control unit (1), DME control unit (2) and integrated supply module (3).

Unlock plug connection on fan for electronics box and detach.

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

Fig 3: Identifying Valvetronic Control Unit

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Unfasten screws.

Remove fan (1) for electronics box.

Fig 4: Identifying Fan For Electronics Box

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Read out fault memory of control unit of Digital Motor Electronics (DME).

Check stored fault messages.

Rectify faults.

Now clear the fault memory.