12 51 100 Replacing wiring loom section for ignition and injectors (S63)

WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Read and comply with notes on protection against damage from electrostatic discharge (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 fault code memory of the DME control unit.
Switch off ignition
Disconnect BATTERY EARTH LEAD .
Remove MICROFILTER HOUSING .
Partially release WIRING LOOM for engine.
Remove COOLANT PIPE from cylinder head cover on left.
Remove FUEL FEED LINE .

Lever out expanding rivet.

Remove gasket (1).

Unfasten screws (2).

Feed out partition wall (3) and remove.

Fig 1: Identifying Expanding Rivet, Partition Wall, Gasket And Mounting 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: Releasing Fresh Air Duct Locks

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Open retainers.

Release lock (1) in direction of arrow.

Remove cover (2).

Fig 3: Releasing Retainer Cover Lock

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

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 Control Unit 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 correctly seated (watertightness).

Fig 5: Unlocking Upper Section Of Partition Seal

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Slacken nut (1).

Tightening torque 13 71 9AZ .

Remove right vacuum reservoir (2) and place to one side.

Fig 6: Identifying Vacuum Reservoir (Right Of Holder) And Mounting Nut

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Slacken nut (1).

Tightening torque 13 71 9AZ .

Remove left vacuum reservoir (2) and place to one side.

Fig 7: Identifying Vacuum Reservoir And Mounting Nut

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Release screws (1).

Tightening torque 11 12 9AZ .

Release screw (2).

Tightening torque 17 10 8AZ .

Remove oil filler neck.

Cover oil filler opening with a cloth.

Fig 8: Identifying Oil Filler Neck And Mounting Bolts

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Release screws (1).

Tightening torque 17 10 7AZ .

Lay expansion tank with holder to one side.

Fig 9: Identifying Retaining Plate Screws

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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 10: Identifying Wiring Loom And Harness, Mounting Bolts

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Release screw (1).

Tightening torque 12 51 2AZ .

Raise cable duct (2).

Fig 11: Identifying Cable Duct And Mounting Bolt

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Remove cable duct (1) from holder by lifting upwards.

Place wiring loom (2) to one side.

Fig 12: Pulling Off Cable Channel From Cable Clip Upwards

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Release screws (1).

Tightening torque 12 51 2AZ .

Raise cable duct (2).

Fig 13: Identifying Cable Duct And Mounting 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 14: 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.