Suspension Control Pressure Sensor/Switch: Service and Repair
Removing and installing/replacing pressure sensor for pneumatic suspension
Caution:
The system must be fully depressurized before any components are replaced.
To do so, raise car on lifting platform.
Lower front and rear axles with BMW diagnostic system in EHC2 program under menu item "Component activation". Carry out each activation 6 times.
After the repairs have been completed, the pneumatic suspension system of the car on the lifting platform must be refilled with air with the diagnostic program (Component activation, raise front and rear axles).
Carry out each activation 6 times.
After this basic filling, lower car from lifting platform, then adjust ride levels in accordance with TIS with diagnostic program and carry out ride level offset.
In area of line connections, extreme cleanliness must be ensured during all tasks!
Even the smallest of dirt particles can cause leakage in the system.
Execute all screw connections in plastic threads with utmost care as threads can very easily be damaged.
Do not kink pipe!
The car must not be set on its wheels with pressureless air spring struts.
The air spring struts can be damaged and destroyed during driving!
A vehicle with a faulty air spring strut is no longer roadworthy!
Release screws of underfloor panel (2) on right side of car.
Release screws under sill cover on right (1).
Warning:
Reduce pressure in accumulator unit before detaching pipe between valve block and accumulator unit.
If the pressure is not reduced, there will be a risk of injury after the pipe and/or the pressure sensor has been detached posed by the sudden escape of air!
Illustration shows removed status.
Pressure reduction:
Undo screw connection at pipe connections on valve block or accumulator unit (arrows) until sound of escaping air can be heard. With screw connection undone, wait approx. 2 mins. until pressure has been completely reduced (hissing sound ceases).
Unlock plug connection (1) and disconnect.
Release pressure sensor (2).