12 14 552 Replacing control unit (DME) cylinders 1-6 (N74): Notes

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2016 BMW 760Li, 2015 BMW 760Li, 2014 BMW 760Li, 2013 BMW 760Li, and 2012 BMW 760Li. 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 right INTAKE PIPE

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.

Release screw (1).

Lay filler neck (2) for windscreen washer fluid to one side.

Fig 1: Identifying Filler Neck And Screw

G06888958

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque: see 2AZ in 12 90 ELECTRONICS BOX, WIRING HARNESS .

Remove electronics box cover (2).

Fig 2: Identifying Electronics Box Cover Screws

G06888959

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock all connectors (1) from control unit and disconnect.

Unclip grommet hold-down device (2) and remove.

Detach rubber grommets (3) from electronics box. Place wiring harnesses to the side.

Installation note:

Make sure grommets are correctly seated (watertightness).

Fig 3: Identifying Control Unit Connectors, Rubber Grommets And Grommet Hold-Down Device

G06888960

Courtesy of BMW OF NORTH AMERICA, INC.

Release outer locks on electronics box at front and rear.

Remove cover (1) from control unit.

Fig 4: Identifying Control Unit Cover

G06888961

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque: see 1AZ in 12 90 ELECTRONICS BOX, WIRING HARNESS .

Unclip coolant lines at clamp (2) from electronics box.

Release the electronics box (3) from the spring strut but do not remove.

Fig 5: Identifying Feed Electronics Box, Clamp And Screws

G06888949

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Picture shows rear coolant line on control unit, procedure for front is identical.

Press in lock (2) and detach coolant line (1) from control unit. Seal coolant line with suitable plugs or disconnect.

Catch and dispose of escaping coolant.

Lift out control unit.

Fig 6: Detaching Coolant Line By Pressing Lock

G06888963

Courtesy of BMW OF NORTH AMERICA, INC.