12 51 001 Replacing wiring harness section for engine (N54, N54T)
Necessary preliminary tasks:
- Read out the fault memory of the DME control unit.
- Switch off ignition.
- Disconnect BATTERY EARTH LEAD .
- Remove INTAKE PLENUM .
- Remove CHARGE AIR DUCT .
Unlock fasteners (1) from below and slide upwards approx. 10 mm.
Unlock locks (2) in direction of arrow.
Remove cover (3).
Unlock connector (1) and remove.
Release grommet (2) from electronics box.
Installation note:
Make sure grommet (2) is correctly seated in housing.
(watertightness).
Raise control unit (3) slightly.
Unlock connectors (1) using slide in direction of arrow and remove.
Short connector:
Unlock slide (2) in bore holes (1) and pull out of housing.
Unlock tab (3), pull contact carrier (4) in direction of arrow out of housing.
Long connector:
Press locking tab (1) in direction of arrow and pull contact carrier (2) out of housing.
Unlock and disconnect all plug connections of engine wiring harness section in electronics box.
| Work step |
|---|
| Unlock plug connections on control sensors and disconnect |
| Unlock connector on heating pipe and disconnect |
| Unlock connector on alternator and disconnect |
| Unlock plug connection on knock sensors and disconnect |
| Release connector on crankshaft sensor and disconnect |
| Unlock connector on starter motor and disconnect |
| Unlock connector on high pressure pump and disconnect |
| Unlock connector on low pressure sensor and disconnect |
| Unlock connector on air conditioning compressor and disconnect |
| Remove REAR UNDERBODY PROTECTION |
| Unlock plug connections on monitoring sensors and disconnect |
| Unlock connector on oil condition sensor and disconnect |
Delete fault memory.