Central Electronics Box Fan: Service and Repair

12 90 100 - Replacing fan for electronics box (N73)





Necessary preliminary tasks:

Note:
Read fault memory.

Switch off ignition.
Follow instructions for disconnecting and connecting battery Instructions for Disconnecting and Connecting Battery.
Disconnect battery.

Important!
Follow instructions for removing and installing electronic control units.

Remove fresh air duct Removing and Installing/Replacing Left or Right Microfilter Air Duct.





Release screw and remove holder (1).
Release screws and remove cover (2) from control unit box.

Note:
Release screws on seal (3) only when removing wiring harness.





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





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.





Unfasten screws.
Remove fan (1) for electronics box.





Check stored fault messages.
Now clear the fault memory.