12 51 100 Replacing wiring harness section for ignition and injectors (N55 Hybrid)

WARNING: High-voltage system - danger to life!

The following points must be strictly observed prior to starting work :

IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) .

Necessary preliminary work:

Read out the fault memory of the DME control unit.
Switch off ignition.
Disconnect BATTERY EARTH LEAD .
Disconnect battery earth lead . See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD or 61 20 900 DISCONNECTING AND CONNECTING BATTERY EARTH LEAD of auxiliary battery and cover.
Remove IGNITION COIL COVER .
Remove CLEAN AIR PIPE .

Release positive battery cable (1) from cable channel.

Disengage cable channel cover (2) to the left and lift out.

Fig 1: Identifying Positive Battery Cable And Channel Cover

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Release wiring harness from cable channel.

Release screws (1).

Release lock (2).

Remove cable channel (3).

Remove soundproofing (4).

Fig 2: Identifying Cable Channel, Screws And Lock

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Release oxygen sensor connector (1) from bracket.

Release screw (2).

Put cable clip aside.

Fig 3: Identifying Oxygen Sensor Connector And Screw

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Unlock rear plug (1) from the control unit and disconnect.

Release rear wiring harness from intake plenum.

Fig 4: Identifying Rear Plug

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Release nuts (1) and remove earth cable.

Tightening torque 12 90 5AZ .

Unlock all connectors from ignition coils and injectors and detach.

Unclip, feed out and remove wiring harness (2).

Fig 5: Identifying Wiring Harness And Nut

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NOTE: Check stored fault messages.
Clear diagnostic fault entries from fault memory.