12 90 100 Replacing fan for electronics box (N62)

WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Read and print out fault memory with MoDiC or BMW DIS
Switch off ignition
Follow instructions for disconnecting and connecting battery, refer to 12 00 ... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .
Disconnect battery
Remove right fresh air duct, refer to 64 31 053 REMOVING AND INSTALLING OR REPLACING FRESH AIR DUCT .

IMPORTANT: Follow instructions for removing and installing control units

Unlock stopper (1) in direction of arrow.

Unfasten screws.

Lift out cover (2).

Fig 1: Lifting Out Cover

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Unlock and detach plug connections (2) on supply module (1).

Unlock and detach plug connections (3) on DME control unit (4).

Unlock and detach plug connections (6) on Valvetronic control unit (5).

Place wiring harness to one side.

Fig 2: Unlocking And Detaching Plug Connections On Supply Module

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Unlock and detach plug (1) on device holder (2).

Fig 3: Unlocking And Detaching Plug On Device Holder

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Unfasten screws.

Lift out device holder (2).

Unlock plug connection on fan for electronics box and detach.

Unfasten screws.

Remove fan (1) for electronics box.

Fig 4: Removing Fan Electronics Box

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Read out fault memory of control unit of Digital Motor

Electronics (DME).

Check stored fault messages.

Now clear the fault memory.