12 51 100 Replacing wiring harness section for ignition coils

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW X5, 2006 BMW X3, 2005 BMW X5, 2005 BMW X3, and 2004 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Read out fault memory of DME control unit
Switch off ignition
Disconnect BATTERY NEGATIVE LEAD from battery.
Remove cover for ignition coils

Unfasten screws.

Fig 1: Removing Cover Of Electronics Box

Courtesy of BMW OF NORTH AMERICA, INC.

Open cover (1) of electronics box and remove.

Unlock plug (1) and detach from DME control unit.

Fig 2: Detaching Plug From DME Control Unit

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (2) and remove.

Lift wiring harness with profile seal (3) out of electronics box.

Installation:

To prevent leaks, you must install profile seal (3) correctly.

Unlock plug retainer (1) of ignition coil and disconnect plug.

Fig 3: Disconnecting Plug Of Ignition Coil

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: This procedure is applicable to all ignition coils.

Release nuts and remove grounding cable.

Unclip cable duct (2).

Unclip wiring harness (3) and remove.

NOTE: Now clear the fault memory.