12 51 001 Replacing wiring harness section for engine (N54)

WARNING: This page is about a different car, the 2010 BMW X6, 2009 BMW X6, and 2008 BMW X6. 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) , see 61 35... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE) .

Necessary preliminary tasks:

Read out fault memory of DME control unit
Switch off ignition
Disconnect battery negative lead , see 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .
Remove charge air duct , see 11 61 368 REPLACING CHARGE-AIR DUCT (N54) or 11 61 368 REMOVING AND INSTALLING/REPLACING REAR LEFT CHARGE-AIR DUCT (N54) .
Remove intake air manifold , see 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (N54) .

Unlock plug (1) and remove.

Release grommet (2) from electronics box.

Installation:

Make sure grommet (2) is correctly seated in housing (watertightness).

Raise control unit (3) slightly.

Fig 1: Identifying Plug, Grommet And Control Unit

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plugs (1) using slide in direction of arrow and disconnect.

Fig 2: Identifying Plugs

Courtesy of BMW OF NORTH AMERICA, INC.

Short plug:

Unlock slide (2) in bore holes (1) and pull out of housing.

Unlock tab (3), pull contact carrier (4) in direction of arrow out of housing.

Fig 3: Identifying Slide, Bore Holes, Tab And Contact Carrier

Courtesy of BMW OF NORTH AMERICA, INC.

Long plug:

Press locking tab (1) in direction of arrow and pull contact carrier (2) out of housing.

Unlock and disconnect all plug connections of engine wiring harness section in electronics box.

Fig 4: Identifying Locking Tab And Contact Carrier

Courtesy of BMW OF NORTH AMERICA, INC.

WORK STEP REFERENCE CHART

Work step	Note:
Unlock plug connections on control sensors and disconnect
Unlock plug on heating tube and disconnect	Open wiring harness protective tube
Unlock plug on alternator and disconnect
Unlock plug connection on knock sensors and disconnect
Unlock plug on crankshaft sensor and disconnect
Unlock plug on starter motor and disconnect
Unlock plug on high-pressure pump and disconnect
Unlock plug on low-pressure sensor and disconnect
Unlock plug on A/C compressor and disconnect
Remove rear underbody protection , see 51 47 491 REMOVING AND INSTALLING/REPLACING REAR UNDERBODY PROTECTION .
Unlock plug connections on monitor sensors and disconnect
Unlock plug on oil condition sensor and disconnect

NOTE: Check stored fault messages.
Now clear the fault memory.