CITROEN XM - Auto;Sport Suspension Problem

57 Auto/sport Suspension Problem Suspension
Citroen XM Internet Reference Version 1.0 85
3/3/99
57 Auto/sport Suspension Problem
Hi, can anyone tell me how to disconnect the “auto-mode” so that it’s never go into “sport” suspension.
Or, how to get the “sport-mode” bulb to light up every time it’s goes into “sport” when it’s in the
“auto-mode”. Or even better: How to modify the el.system so that the switch (sport - auto) sets the car in
sport or “soft” mode (i.e. no automatic).
It is a ‘91 mod. 2.0 injection. (PR 4950). Thanx...
Asgeir Jordahl
ajordahl@online.no
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Most citroen dealers have a small test-box (size approx. 15x5x3 cm) that can be connected to the
suspension-computer and it does exactly that. It’s rather primitive, so I think it’s just a matter of shorting
some pins on the connector. If you’re able to figure out how this box works (which must be simple) you
will have the solution to your problem.
I had such a testbox more or less for over a year in my ‘89 Xm because the suspension-computer failed
badly in this early car. I gave it away together with this dammed red beast...
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On my XM ‘90 model I found that I had a faulty accelerator pedal sensor. I have disconnected the
electrical connector next to the sensor, by the pedal, and now the suspension never goes into sport
mode and therefore stays soft all the time regardless of driving style. I would be very interested to know
if you have the same effect if you try this. It appears to be a cheap(free), simple and reversible way of
keeping the car’s suspension soft.
Yours ,
Mark
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The sensor is on the accelerator pedal itself and the plug is on the lead attached to the sensor, very near
to the sensor. It really is no work at all, you just have to move the seat back and the steering wheel up
and lie on the seat with your head by the pedals! Check with your doctor that it is safe for you to assume
this position.
Also the system did fail safe to ‘hard’ when the sensor failed, but *disconnecting* the sensor and
expecting it to fail safe is a bit like disconnecting the hydraulic pipes from the brakes and expecting them
to fail safe.
Mark
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disconnecting something is like “cable broken” which should be detected in all cases. Furthermore, a
connector might get unplugged accidentlyor by mechanical stress which is also an unexpected
failure.btw: “disconnecting” a hydraulic pipe from a brake _is_ tolerated by the system.(as long as you
don’t unplug all four brakes at the same time ;-)