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

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

Courtesy of BMW OF NORTH AMERICA, INC.

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).

Fig 2: Unlocking And Detach Plug Connections On Valvetronic Control Unit

Courtesy of BMW OF NORTH AMERICA, INC.

Place wiring harness to one side.

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

Unfasten screws.

Lift out device holder (2).

Fig 3: Lifting Out Device Holder

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug connection on fan for electronics box and detach.

Unfasten screws.

Remove fan (1) for electronics box.

Fig 4: Removing Fan Electronics Box

Courtesy of BMW OF NORTH AMERICA, INC.

Read out fault memory of control unit of Digital Motor

Electronics (DME).

Check stored fault messages.

Now clear the fault memory.