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+--- Thread: VDDM height sensors (/showthread.php?tid=1316)
VDDM height sensors - damachone - 05-11-2026
Hi everyone
I recently replaced the lower link on the rear right suspension height sensor on my 2017 S90.
I don't have air suspension, so this is only used for headlamp levelling.
I still get a DTC saying the value is out of range, and when I monitor the VDDM DIDs for front and rear height, the readings are very different and move in opposite directions when the vehicle height changes.
I was really hoping someone could check this on an S90 and tell me what "normal" looks like!
When I replaced the lower link, the "elbow" could go in two orientations, either towards the centre or outside of the vehicle and I am wondering if I picked the wrong one...
Any suggestions much appreciated!
RE: VDDM height sensors - liushaohuai5 - 05-27-2026
(05-11-2026, 03:44 PM)damachone Wrote: Hi everyone
I recently replaced the lower link on the rear right suspension height sensor on my 2017 S90.
I don't have air suspension, so this is only used for headlamp levelling.
I still get a DTC saying the value is out of range, and when I monitor the VDDM DIDs for front and rear height, the readings are very different and move in opposite directions when the vehicle height changes.
I was really hoping someone could check this on an S90 and tell me what "normal" looks like!
When I replaced the lower link, the "elbow" could go in two orientations, either towards the centre or outside of the vehicle and I am wondering if I picked the wrong one...
Any suggestions much appreciated!
Should be towards the outside of the vehicle. Btw, are you using Orbit to monitor the VDDM DIDs? I am not sure if Orbit can do SUM monitoring.
RE: VDDM height sensors - damachone - 05-31-2026
(05-27-2026, 07:48 PM)liushaohuai5 Wrote:(05-11-2026, 03:44 PM)damachone Wrote: Hi everyone
I recently replaced the lower link on the rear right suspension height sensor on my 2017 S90.
I don't have air suspension, so this is only used for headlamp levelling.
I still get a DTC saying the value is out of range, and when I monitor the VDDM DIDs for front and rear height, the readings are very different and move in opposite directions when the vehicle height changes.
I was really hoping someone could check this on an S90 and tell me what "normal" looks like!
When I replaced the lower link, the "elbow" could go in two orientations, either towards the centre or outside of the vehicle and I am wondering if I picked the wrong one...
Any suggestions much appreciated!
Should be towards the outside of the vehicle. Btw, are you using Orbit to monitor the VDDM DIDs? I am not sure if Orbit can do SUM monitoring.
Thanks - looks like I had it fitted correctly.
The DIDs look like the attached screenshot - they seem to move in opposite directions and are quite offset - I was wondering if that was normal?
The graph shows the sensor readings when I got out of the vehicle and then repeatedly pushed on the sill kick plate. The car was parked pretty much level.
RE: VDDM height sensors - damachone - 06-02-2026
(05-31-2026, 07:49 PM)damachone Wrote:(05-27-2026, 07:48 PM)liushaohuai5 Wrote:(05-11-2026, 03:44 PM)damachone Wrote: Hi everyone
I recently replaced the lower link on the rear right suspension height sensor on my 2017 S90.
I don't have air suspension, so this is only used for headlamp levelling.
I still get a DTC saying the value is out of range, and when I monitor the VDDM DIDs for front and rear height, the readings are very different and move in opposite directions when the vehicle height changes.
I was really hoping someone could check this on an S90 and tell me what "normal" looks like!
When I replaced the lower link, the "elbow" could go in two orientations, either towards the centre or outside of the vehicle and I am wondering if I picked the wrong one...
Any suggestions much appreciated!
Should be towards the outside of the vehicle. Btw, are you using Orbit to monitor the VDDM DIDs? I am not sure if Orbit can do SUM monitoring.
Thanks - looks like I had it fitted correctly.
The DIDs look like the attached screenshot - they seem to move in opposite directions and are quite offset - I was wondering if that was normal?
The graph shows the sensor readings when I got out of the vehicle and then repeatedly pushed on the sill kick plate. The car was parked pretty much level.
Re-attached the screenshot as you can't see inline images on mobile browsers.
RE: VDDM height sensors - damachone - 06-12-2026
If anyone would be kind enough to log the same graph for a vehicle on level ground it would be super helpful.
I think one of the sensors is reading too high or low, which is causing the headlights to be aimed low. Unfortunately there doesn't seem to be a calibration function for the height sensors, so I'll probably have to replace the sensor that's not reading correctly, but at the moment I can't tell which one it is! (though I strongly suspect it's the rear one...)