12 14 550 Replacing control unit (DME) (N63, 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 electrostatic damage (ESD protection)

Necessary preliminary tasks:

Switch off ignition
Disconnect BATTERY EARTH LEAD .
Remove MICROFILTER HOUSING .

IMPORTANT: Follow INSTRUCTIONS for removing and installing control units.

Replacement:

Carry out programming/encoding
If no data can be read out from the previous control unit, carry out injection quantity compensation (description at end of instructions).

IMPORTANT: It is absolutely essential to read out the fault memory with the BMW diagnosis system and to create a fault memory printout.

Switch off ignition.

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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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 looms from lower section of partition seal and from electronics box.

Installation note:

Make sure grommets are is correctly seated (watertightness).

Fig 4: Unlocking Upper Section Of Partition Seal

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Unlock connector (1) on control unit and disconnect.

Remove control unit.

Installation note:

Replacement:

Note device identification number and encoding.

Fig 5: Identifying Control Unit Connectors

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Injector adjustment

If the DME control unit has been replaced, it will also be necessary to carry out adjustment of the injectors!

Injector adjustment is carried out with the aid of so-called adjustment values.

The adjustment values are printed in two blocks of three digits on each injector.

The adjustment values must be stored in the new control unit!

Fig 6: Identifying Adjustment Value Printed On Injectors

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If injector adjustment is not carried out, the engine may run roughly or fail to start.

Read off the adjustment values and enter according to the installation location (cylinder) of the injectors:

Connect BMW diagnosis system
Identify vehicle
Select "Function selection"
Select "Service functions"
Select "Engine electronics"

Fig 7: Identifying Adjustment Value Printed On Injectors
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Select "Adjustment function"
Select "Adjust injectors"
Change "Test schedule"
The adjustment value must be entered for each cylinder.

NOTE: Check stored fault message.

Delete fault memory.