BMW 7 Series: Replacing Wiring Harness Section For Engine (n63)

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

Necessary preliminary work

• Read out the fault memory of the DME control unit.
• Switch off ignition.
• Disconnect BATTERY EARTH LEAD.
• Remove right SUSPENSION CROSS-BRACE.
• Remove SOUND INSULATION for bulkhead on left
• Remove left and right INTAKE FILTER HOUSINGS.
• Remove charge air cooler on left and right.
• Remove intake manifold on left and right.
• Partially remove WIRING HARNESS for ignition and injectors.
• Detach ENGINE OIL PIPE from oil sump.

Picture shows the left side, the procedure for the right side is identical.

Lever expander rivets (1) out of cover (2).

Installation note: If necessary, replace damaged expanding rivets.

Make sure holders (3) are correctly seated.

Fig. 86: Identifying Rivets, Cover And Holders

Release screws (1).

Tightening torque 12 90 4AZ.

Release retainer (2).

Remove cover (3) from supplementary box.

Fig. 87: Identifying Supplementary Electronics Box Cover, Retainer And Screws

Disconnect all plugs from carrier plate (1) and release from supplementary electronics box.

Installation note: Make sure rubber grommets are correctly fitted (watertightness).

Fig. 88: Identifying Carrier Plate

Unclip grommet hold-down device (1).

Release wiring harness (2) from bulkhead.

Unlock connector (3) and remove.

Fig. 89: Identifying Grommet Hold-Down Device, Bulkhead Wiring Harness And Connector

Release screws (1).

Tightening torque 12 90 2AZ.

Remove electronics box cover (2).

Fig. 90: Identifying Electronics Box Cover And Screws

Unlock all connectors (1) from control unit and disconnect.

Unclip grommet hold-down device (2) and remove.

Detach rubber grommets (3) from electronics box. Place wiring harnesses to the side.

Installation note: Make sure grommets are correctly seated (watertightness).

Fig. 91: Identifying Control Unit Connectors, Grommet Hold-Down Device And Electronics Box Rubber Grommets

Slacken nut (1).

Tightening torque 12 51 1AZ.

Detach earthing cable (2).

Fig. 92: Identifying Nut And Earthing Cable

Release screw (1).

Tightening torque 12 51 2AZ.

Fig. 93: Identifying Screw

Release screws (1).

Tightening torque 12 51 2AZ.

Release wiring harness (2).

Release wiring loom (3) and lay to one side.

Fig. 94: Identifying Screws, Wiring Harness And Wiring Loom

Release screw (1).

Tightening torque 12 51 2AZ.

Raise cable duct (2).

Fig. 95: Identifying Cable Duct And Screw

Pull off cable duct (1) from cable holder (2) in upward direction.

Cable (3) does not have to be released.

Fig. 96: Identifying Cable Duct, Cable Holder And Holder Cable

Release screws (1).

Tightening torque 12 51 2AZ.

Raise cable duct (2).

Fig. 97: Identifying Cable Duct And Screw

Release screws (1).

Tightening torque 12 51 2AZ.

Release screw (2).

Lay wiring loom (4) to one side.

Release wiring harness (3) and lay to one side.

Fig. 98: Identifying Screw, Wiring Harness And Wiring Loom

CONNECTORS AND LINES REFERENCE CHART

Release wiring harness if necessary from existing clips and clamps.

Feed out wiring harness and remove.

Installation note: Check wiring harness installation arrangement.

Check plug connections for correct fit.

Check stored fault message.

Delete fault memory.

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