12 51 306 Removing and installing/replacing supply module wiring harness section (N63 B40/44 O 1)

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2017 BMW 550i GT xDrive, 2017 BMW 535i GT xDrive, 2017 BMW 535i GT, 2016 BMW 550i GT xDrive, and 2016 BMW 535i GT xDrive. 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 tasks:

Read out the fault memory of the DME control unit.
Switch off ignition.
Disconnect NEGATIVE BATTERY CABLE .
Remove right SUSPENSION CROSS-BRACE .
Remove SOUND INSULATION for bulkhead on right.
Remove left TRAILING LINK .
Remove right-hand INTAKE SILENCER HOUSING .
Remove INTAKE PORT on left and right
Remove underbody protection at front and rear.UNDERBODY PROTECTION (FRONT) and UNDERBODY PROTECTION (REAR) .
Only F12 and all-wheel drive vehicles: See REMOVE AND INSTALL/REPLACE STIFFENING PLATE (ALL-WHEEL DRIVE)

Fig 1: Overview Of Supply Module Wiring Harness Section

Courtesy of BMW OF NORTH AMERICA, INC.

Overview of supply module wiring harness section.

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

Slacken nut (1).

Tightening torque 12 51 2AZ .

Remove ground cable.

IMPORTANT: If the nut (1) is released, the ground pin (double pin) underneath must be retightened!
Retighten ground pin.
Tightening torque 12 51 3AZ

Fig 2: Identifying Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Release clamp (2).

Remove lid (3) from auxiliary box.

Fig 3: Identifying Screws, Clamp And Lid

Courtesy of BMW OF NORTH AMERICA, INC.

Disconnect all plugs from carrier plate (1) and release from supplementary electronics box.

Installation note:

Make sure rubber grommets are correctly fitted (watertightness).

Fig 4: Identifying Carrier Plate

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Tightening torque 17 22 4AZ .

Release screw (2).

Tightening torque 17 22 5AZ .

Remove engine oil pipes from oil filter control housing and take off oil sump.

Catch and dispose of emerging oil.

Installation note:

Replace all sealing rings of engine oil pipes!

Check the engine oil level after repair work is completed. Top up, if applicable.

Fig 5: Identifying Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock and disconnect following connectors and lines
Unlock connector on transmission and disconnect
Unlock connector of DME control units and pull off
Unlock plug connection to wiring harness section sensor system module cylinder 1-4 (in vicinity of starter motor) and pull off.

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.