12 51 001 Replacing Wiring Harness Section for Engine

12 51 001 - Replacing wiring harness section for engine (N52K)





Special tools required:
- 24 2 390 24 2 390 Covering Cap





Important!
Read and comply with notes on protection against electrostatic damage (ESD protection) 61 35 ... Notes on ESD Protection (Electro Static Discharge)!





Necessary preliminary tasks:
- Read out fault memory of DME control unit
- Switch off ignition
- Disconnect battery negative lead 61 20 900 Disconnecting and Connecting Battery Negative Lead
- Remove microfilter housing 64 31 081 Removing and Installing/Replacing Microfilter Housing
- Remove intake air manifold Service and Repair





Unclip Bowden cable for engine bonnet/hood actuator from transverse reinforcement (1).

Release screws on left and right sides. Tightening torque 51 71 4AZ Specifications.

Remove cross-brace (1).





Lever out expander rivet.

Remove gasket (1).

Release screws (2).

Feed out partition (3) and remove.





Lever out expander rivet.

Release locks in direction of arrow.

Feed out fresh air duct (1) and remove.





Open retainers.

Release lock (1) in direction of arrow.

Remove cover (2).





Release screws and remove retaining bar (1).

Unlock upper section (2) of partition seal in direction of arrow and remove.

Release grommets (3) for wiring harnesses from lower section of partition seal and from electronics box.

Installation Note:
Make sure grommets are correctly seated (watertightness).





Raise control unit (2) slightly.

Unlock plugs (1) using slide in direction of arrow and remove.





Long plug:

Unlock plug on control unit and disconnect.

Unlock tab (1), pull contact carrier (2) in direction of arrow out of housing.





Short plug:

Unlock slide (2) in bore holes (1) and pull out of housing.

Unlock tab (3), pull contact carrier (4) in direction of arrow out of housing.

Unlock and disconnect all plug connections of engine wiring harness section in electronics box.





Unlock tabs (1) and pull contact carrier (2) out of housing.









Unlock and disconnect plug (1) by turning.

Release wiring harness from holders.

Insert special tool 24 2 390 24 2 390 Covering Cap in sealing sleeve.

These tasks are described in Notes on mechatronics Procedures.

(Important: Observe important note)





Note:
Check stored fault messages.

Now clear the fault memory.