12 51 001 Replacing Wiring Harness Section for Engine

12 51 001 Replacing Wiring Harness Section For Engine (S63)







IMPORTANT: Read and comply with notes on protection against damage from electrostatic discharge (ESD protection).







Necessary preliminary tasks:
- Read out fault memory of DME control unit
- Turn off ignition
- Disconnect battery negative lead
- Remove intercooler on left and right
- Remove intake manifold on left and right
- Partially remove wiring harness for ignition and injectors.
- Detach engine oil line from oil sump







Lever out expander rivet.
Remove gasket (1).
Unfasten 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).







Unlock all plugs (1) of DME control unit and disconnect.
Unlock plug on electronics box fan and disconnect.
Unlock all plugs on plug strip (2) and detach.
Unlock plug strip (2) and remove towards top.
Unlock all plugs on plug strip (3) and detach.
Unlock plug strip (3) and remove towards top.

Installation:
When replacing wiring harness, modify plug strips (2) and (3) if necessary.







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:
Make sure grommets are is correctly seated (watertightness).







Release screws (1).
Tightening torque 17 10 7AZ.
Place expansion tank with retaining plate to one side.







Slacken nut (1).
Tightening torque 13 71 9AZ.
Remove vacuum reservoir (2) left of holder and place aside.







Slacken nut (1).
Tightening torque 13 71 9AZ.
Remove vacuum reservoir (2) right of holder and place aside.







Release screw (1).
Tightening torque 12 51 2AZ.







Release screws (1).
Tightening torque 12 51 2AZ.
Release wiring harness (2).
Release wiring harness (3) and lay to one side.







Release screw (1).
Tightening torque 12 51 2AZ.
Raise cable duct (2).







Pull off cable channel (1) from cable clip upwards.
Expose wiring harness (2).







Release screws (1).
Tightening torque 12 51 2AZ.
Raise cable duct (2).







Remove coolant pipe (1).
Unfasten screws (2).
Tightening torque 12 51 2AZ.
Lay wiring harness (4) to one side.
Release wiring harness (3) and lay to one side.












Release wiring harness if necessary from existing clips and retainers
Feed out wiring harness and remove.







Installation:
Check wiring harness routing.
Check plug connections for correct seating.
Check stored fault message.
Delete fault memory.