12 51 245 Replacing the wiring harness section for the engine transmission module (N20)

WARNING: This page is about a different variant/trim than selected.

IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) .

Necessary preliminary tasks:

Read out the fault memory of the DME control unit.
Switch off ignition.
Remove intake PLENUM .
Remove REAR UNDERBODY PROTECTION .

Fig 1: Identifying Engine Transmission Module Wiring Harness Section

Courtesy of BMW OF NORTH AMERICA, INC.

Overview of wiring harness section for engine transmission module (graphic shows wiring harness for vehicles with automatic transmission and four-wheel drive).

Release screws (1) along line (1).

Tightening torque 12 52 7AZ .

Fig 2: Identifying Electronic Box Cover Mounting Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Detach all engine wiring harness section connectors from electronics box (1).

Installation note:

Make sure rubber grommets are correctly fitted (watertightness).

Fig 3: Identifying Electronics Box

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock and disconnect following connectors and lines
Unlock and disconnect connector on DME control unit
Unlock connector on air conditioning compressor and disconnect
Unlock connector on starter motor and disconnect
Release ground cable of crankcase
Unlock and disconnect connector for wiring harness section of engine sensor system module 1
Unlock and disconnect connector on reversing light switch	Manual gearbox only
Unlock connector on transmission and disconnect	Automatic transmission only

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.

Delete fault memory.