12 51 001 Replacing Wiring Harness Section For Engine (N52)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. 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) (CONVERTIBLE) or 61 35... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE) (COUPE) .

Necessary preliminary tasks:

Read out fault memory of DME control unit
Switch off ignition
Follow instructions for disconnecting and connecting battery . See 12 00... Instructions For Disconnecting And Connecting Battery .
Disconnect battery negative lead from battery and lay to one side. See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD (CONVERTIBLE) or 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD (COUPE) .
Remove lower section of microfilter housing . See 64 31 081 REMOVING AND INSTALLING/REPLACING MICROFILTER HOUSING (UPPER SECTION) and 64 31 092 REMOVING AND INSTALLING/REPLACING MICROFILTER HOUSING (LOWER SECTION)
Remove intake air manifold . See 11 61 050 REMOVING AND INSTALLING AIR INTAKE MANIFOLD (N52K) .
Remove cylinder head cover . See 11 12 000 REMOVING AND INSTALLING OR SEALING CYLINDER HEAD COVER (N52K) .
Remove REAR UNDERBODY PROTECTION .

Unlock fasteners (1) from below and slide upwards approx. 10 mm.

Unlock locks (2) in direction of arrow.

Remove cover (3).

Fig 1: Unlocking Locks In Direction Of Arrow

G04751288

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug on control unit and disconnect.

Unlock tab (1), pull contact carrier (2) in direction of arrow out of housing.

Fig 2: Pulling Contact Carrier

G04751358

Courtesy of BMW OF NORTH AMERICA, INC.

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.

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

Fig 3: Pulling Contact Carrier

G04751359

Courtesy of BMW OF NORTH AMERICA, INC.

Illustration shows cylinder head cover.

Release screws and remove holder (1).

Tightening torque, see 12 52 1AZ in 12 52 PLUG CONNECTIONS, TERMINALS, LOOSE PARTS .

Fig 4: Locating Screws & Holder

G04751360

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE:

Check stored fault messages.

Now clear the fault memory.