G'day From Australia!

[citroenxm]

I guess with your dry climate there's no reason for any alloy corrosion to crush the rear sensors in place on the rear arms..
they are a nightmare for it here in the UK..

[Dieselman]

So, I move on to the Hydractive. As I posted earlier, I have installed an LED tell tale so I can monitor electrovalve operation, as I wasn't happy with the ride quality. Well I can see it switch, but it's pretty random (to me) & it spends more time in hard than soft. I can make it switch with the steering, accelerator & brake, but I can be cruising along a flat, straight road at 70kph (40mph), light throttle, just ticking along & it'll be in hard mode..Half way through a corner it'll switch to soft. Something is wrong. I checked for fault codes & have code 25, which I believe is the Body sensor.

Suspect a poor connection.
If any sensor fails to give variable feedback the ECU assumes sensor failure and reverts to hard mode.

The body movement sensor is usually the least sensitive.
Perform the checks detailed in the below thread.
viewtopic.php?f=7&t=9038