12 51 001 Replacing wiring harness section for engine (N63)

WARNING: This page is about a different car, the 2013 BMW X5, 2012 BMW X5, and 2011 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DAMAGE (ESD PROTECTION) .

IMPORTANT: Screw back on all screw points of cable channels without fail ! Some screw points are also ground points. If the wiring harnesses are not correctly screwed tight and secured, this may cause DME malfunction and failure!

Necessary preliminary work:

Read out the fault memory of the DME control unit.
Switch off ignition.
Disconnect BATTERY NEGATIVE LEAD .
Remove left and right INTAKE SILENCER HOUSINGS .
Remove charge air cooler . See 17 51 001 REMOVING AND INSTALLING/REPLACING LEFT CHARGE AIR COOLER (N63) or 17 51 001 REMOVING AND INSTALLING/REPLACING RIGHT CHARGE AIR COOLER (N63) on left and right.
Remove intake manifold . See 11 61 068 REMOVING AND INSTALLING/REPLACING RIGHT INTAKE MANIFOLD (N63) or 11 61 065 REMOVING AND INSTALLING/REPLACING LEFT INTAKE MANIFOLD (N63) on left and right.
Partially remove WIRING HARNESS for ignition and injectors.
Detach ENGINE OIL PIPE from oil sump

Lever out expanding rivet.

Remove gasket (1).

Unfasten screws (2).

Feed out partition wall (3) and remove.

Fig 1: Identifying Partition Wall, Gasket And Screws

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Lever out expanding rivet.

Release locks in direction of arrow.

Feed out fresh-air duct (1) and remove.

Fig 2: Identifying Fresh-Air Duct

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Open retainers.

Release lock (1) in direction of arrow.

Remove cover (2).

Fig 3: Removing Control Unit (DDE) Lock And Cover

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Unlock and pull off all connectors (1) on DME control unit.

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.

Fig 4: Identifying DME Control Unit, Strip & Connectors

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Installation note:

When replacing wiring loom, modify plug strips (2) and (3) if necessary.

Release screws and remove retaining bracket (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 is correctly seated (watertightness).

Fig 5: Identifying Retaining Bracket, Upper Section And Grommets

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Release screw (1).

Tightening torque: 12 51 2AZ .

Fig 6: Identifying DME Control Unit Screw

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Release screws (1).

Tightening torque: 12 51 2AZ .

Release wiring harness (2).

Release wiring loom (3) and lay to one side.

IMPORTANT: Screw back on all screw points of cable channels without fail. Some screw points are also ground points .

Fig 7: Identifying Wiring Harness And Screws

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Release screw (1).

Tightening torque: 12 51 2AZ .

Raise cable duct (2).

Fig 8: Identifying Cable Duct With Screw

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Pull off cable duct (1) from cable clip (2) in upward direction.

Cable (3) does not have to be released.

Fig 9: Pulling Off Cable Duct From Cable Clip

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Release screws (1).

Tightening torque: 12 51 2AZ .

Raise cable duct (2).

Fig 10: Identifying Cable Duct And Screws

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Remove COOLANT PIPE (1).

Unfasten screws (2).

Tightening torque: 12 51 2AZ .

Lay wiring loom (4) to one side.

Release wiring harness (3) and lay to one side.

IMPORTANT: Screw back on all screw points of cable channels without fail. Some screw points are also ground points .

Fig 11: Identifying Coolant Pipe, Wiring Loom And Mounting Screws

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Unlock and disconnect following connectors and lines
Unlock connector on crankshaft sensor and disconnect	Transmission wiring harness
Unlock connector on transmission and disconnect	Transmission wiring harness
Unlock connector on oil pressure sensor and disconnect	Transmission wiring harness
Unlock plug on right inlet camshaft pulse generator and disconnect	Transmission wiring harness
Unlock plug on right exhaust camshaft pulse generator and disconnect	Transmission wiring harness
Unlock connector on starter motor and disconnect	Transmission wiring harness
Unlock connector on oil level sensor and disconnect	Transmission wiring harness
Disconnect ground cable. Tightening torque 12 51 1AZ .	Transmission wiring harness
Unlock connector on left and right hot film air mass meter and remove	Engine wiring harness
Unlock and pull off connectors from high pressure pump on left and right	Engine wiring harness
Unlock connector on left and right control sensors and disconnect	Engine wiring harness
Unlock plug on left and right monitor sensors and disconnect	Engine wiring harness
Unlock plug on left and right high-pressure fuel sensors and disconnect	Engine wiring harness
Unlock plug on left and right intake air pressure sensors and disconnect	Engine wiring harness
Unlock connector on air conditioning compressor and disconnect	Engine wiring harness
Unlock plug on left and right knock sensors and disconnect	Engine wiring harness
Unlock plug on left and right charge-air pressure sensors and disconnect	Engine wiring harness
Unlock plug on coolant temperature sensor to coolant pump and disconnect	Engine wiring harness
Unlock connector on coolant thermostat and disconnect	Engine wiring harness
Unlock plug on pressure transducers and disconnect	Engine wiring harness
Unlock plug on left and right throttle valve assemblies and disconnect	Engine wiring harness
Unlock plugs on solenoid valves for camshaft adjustment on left and right and disconnect	Engine wiring harness
Unlock plug on turbocharger coolant pump and disconnect	Engine wiring harness
Unlock and pull off connectors of exhaust turbochargers	Engine wiring harness
Unlock connector on alternator and disconnect	Engine wiring harness
Unlock plug on right inlet camshaft pulse generator and disconnect	Engine wiring harness
Unlock plug on right exhaust camshaft pulse generator and disconnect	Engine wiring harness
Unlock plug on low-pressure fuel sensor and disconnect	Engine wiring harness
Unlock plug on coolant pump for charge air cooler and disconnect	Engine wiring harness

Release wiring harness if necessary from existing clips and clamps.

Feed out wiring harness and remove.

Installation note:

Check wiring harness installation arrangement.

Check plug connections for correct fit.

Check stored fault message.

Clear diagnostic fault entries from fault memory.