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

WARNING: This page is about a different car, the 2002 BMW Z3 and 2001 BMW Z3. 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. Refer to 12 00 ... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .

Disconnect battery negative lead from battery.

Z3, E39, E46, E53:

Remove cover for ignition coils.

Detach plug of wiring harness for ignition coils from DME control unit. Refer to 12 14 550 REPLACING CONTROL UNIT (M54 / S54) . 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 From Connecting Plate

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and detach from ignition coils.

Fig 2: Detaching Ignition Coils Plugs

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock cable strip (2) and remove towards top.

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.

Fig 3: Removing Cable With Profile Seal From Partition Wall

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

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

Z3, E46, E53 and E39:

NOTE: Interrogate fault memory of DME control unit.

Check stored fault messages.

Rectify faults.

Then clear fault memory.