12 51 100 Replacing wiring harness section for ignition coils (M54)

WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2006 BMW 330Ci, 2006 BMW 325Ci, 2005 BMW 330xi, 2005 BMW 330i, and 2005 BMW 330Ci. However, it is still accessible from the selected car via links, so may be relevant.

Interrogate 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.

E53 only:

Remove heater bulkhead. 51 71 080 REMOVING AND INSTALLING/REPLACING HEATER BULKHEAD

Z3, E39, E46, E53:

Remove cover for ignition coils. See 11 12 000 REMOVING AND INSTALLING, SEALING CYLINDER HEAD COVER (M52TU / M54 / M56)

Detach plug of wiring harness for ignition coils from DME control unit. This operation is described in 12 14 550 REPLACING CONTROL MODULE (DME) . Disconnect plug connection of wiring harness for ignition coils in electronics box.

NOTE: Do not remove DME control unit.

Detach grounding strap (2) of cable duct from connecting plate of ignition coils between cylinders 2 and 3.

Fig 1: Detaching Grounding Strap Of Cable Duct

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Unlock plug (1) and detach from ignition coils.

Unlock cable strip (2) and remove towards top.

Fig 2: Unlocking Plug & Detaching From Ignition Coils

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E53 only:

Remove water reservoir for windshield washer system.

Remove cable (1) with profile seal from partition wall (3).

Unclip cable (2) from partition wall (3).

Release screw connection of partition wall (3) with body.

Remove partition wall (3).

Fig 3: Releasing Screw Connection Of Partition Wall With Body

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Pull profile seal (1) out of electronics box.

Release locks (2).

Remove strip (3).

Pull out profile seal (4).

Installation:

To prevent leaks, you must install profile seals (1 and 4) correctly.

Fig 4: Pulling Out Profile Seal

Courtesy of BMW OF NORTH AMERICA, INC.

E46 and Z3 only:

NOTE: Shown on the E46. The same procedure applies to the Z3.

Pull off sealing strip (1).

Remove cable (3) together with profile seal (2) from partition wall towards top.

Installation:

To prevent leaks, you must install profile seal (2) correctly.

Fig 5: Installing Profile Seal

Courtesy of BMW OF NORTH AMERICA, INC.

E39 only:

Release locks (1).

Remove cable (3) together with profile seal (2) from partition

wall towards top.

Installation:

To prevent leaks, you must install profile seal (2) correctly.

Fig 6: Removing Cable Together With Profile Seal

Courtesy of BMW OF NORTH AMERICA, INC.

Z3, E46, E53 and E39:

NOTE: Interrogate fault memory of DME control unit.
Check stored fault messages.
Rectify faults.
Then clear fault memory.