12 51 100 Replacing wiring harness section for ignition and injectors (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 EARTH LEAD
REMOVE intake silencer housing on left and right
Remove MICROFILTER HOUSING
Partially release WIRING LOOM for engine
Remove COOLANT PIPE from cylinder head cover on left
Remove FUEL DELIVERY LINE

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 Terminal And Plug Strips

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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 correctly seated (watertightness).

Fig 5: Identifying Retaining Bracket, Upper Section And Grommets

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Release clamps (1) and (2).

Replace clamps (2).

Detach both charge-air ducts (3) and remove.

Check the gaskets on the exhaust turbocharger. replacing if necessary.

Fig 6: Identifying Charge-Air Ducts And Clamps

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Picture shows the left side, the procedure for the right side is identical.

Detach hoses (1) from clean air pipe.

Release screw (2).

Tightening torque: 13 71 1AZ .

Detach clean-air pipe (3) in direction of travel from exhaust turbocharger.

Check the gasket on the clean air pipe. replacing if necessary.

Fig 7: Identifying Clean-Air Pipe, Hoses And Screw

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Release screws (1).

Tightening torque: 12 51 2AZ .

Unlock plugs on injectors and ignition coils and detach.

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 8: Identifying Wiring Harness And Screws

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Release screw (1).

Tightening torque: 12 51 2AZ .

Raise cable duct (2).

Fig 9: 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 10: Pulling Off Cable Duct From Cable Clip

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Release screws (1).

Tightening torque: 12 51 2AZ .

Raise cable duct (2).

Fig 11: Identifying Cable Duct And Screws

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Remove COOLANT PIPE (1).

Unfasten screws (2).

Tightening torque: 12 51 2AZ .

Unlock plugs on injectors and ignition coils and detach.

Lay wiring loom (4) to one side.

Feed out air wiring harness (3) and remove.

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

Fig 12: Identifying Coolant Pipe, Wiring Loom And Mounting Screws

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NOTE: Check wiring harness installation arrangement.

Check plug connections for correct fit.

Check stored fault message.

Clear diagnostic fault entries from fault memory.