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  #11  
Old 08-31-2016, 05:55 PM
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Quote:
Originally Posted by Beniki View Post
Hi all,

My experience started about 2 months back, when i started having SLS inactive messages popping up. Long story short, the fault was found to be caused by a faulty alternator, which was causing all sorts of errors on most body systems.
I also noted throughout this experience that the FL corner of the car would sag when the SLS was inactive, which lead me to leak test and identify pin leaks from the FL air spring.
After the alternator was replaced, the car reported no further errors for nearly a month. However, to prevent undue strain on the pump and sls system, the leaky air spring was replaced on Thursday with an Arnott unit.
Interesting that the fault was traced to a bad alternator.
I've got the same 'SLS inactive' message issue, but no leaking/sagging air springs.
I've suspected low battery voltage may be the culprit as it's pretty sluggish at times if not in daily use.....but maybe I should be getting the alternator tested before replacing the battery?
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  #12  
Old 08-31-2016, 09:50 PM
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Quote:
Originally Posted by 4.8iS Le Mans_NZ View Post
Interesting that the fault was traced to a bad alternator.
I've got the same 'SLS inactive' message issue, but no leaking/sagging air springs.
I've suspected low battery voltage may be the culprit as it's pretty sluggish at times if not in daily use.....but maybe I should be getting the alternator tested before replacing the battery?
Hello from across the Tasman! Nice to have someone somewhat local on here...
What lead me to diagnose it as the alternator was a combination of erratic behaviour from all systems (Nav, TV, DSC, x-drive, SLS, light control module, etc). The only thing common to all of these systems is the power supply.
The best way to diagnose it is to look at your power supply on a scope (ideally a recording scope), so that you can see if you are getting spikes.

Update on the suspension: I have placed the car in production mode until the new sensor comes in and have cleared the rediculous offset counts to zero.
Once the new (correct) sensor is in place I will recalibrate and hopefully have a working system.
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  #13  
Old 09-02-2016, 04:26 PM
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Problem has been resolved. We replaced the incorrect height sensor with the right part, which took care of the hardware fault, and manually reset the offset counts to zero, then calibrated the suspension off that base. All is working well now with no errors.
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  #14  
Old 11-28-2016, 06:40 PM
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Originally Posted by Beniki View Post
Problem has been resolved. We replaced the incorrect height sensor with the right part, which took care of the hardware fault, and manually reset the offset counts to zero, then calibrated the suspension off that base. All is working well now with no errors.
Hi, I was reading this, and bofore I change my X5 to springs I want to make a new try...

In the reading with INPA, I see that more or less the height are corret, 0mm or 3mm, but more or less ok, I can try to adjust to exactly match... but the offset value, reading exactly "offset values fro the ECU" reads 362, 457, 450, and !!! -707 in the left front. Everytime I have a EHC maltfunction, it reads as the fault code plausability front left... has this soemthing to do with the offset reading negative in -707???

you said that you had to reset the offset counts to zero and then calibrate, but, how do you do that, how do you reset the offset to zero? what are you doing by doing that, and why is mine reading negative at -707?? The left front sensor is just new, by the way.

many thanks!!!
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  #15  
Old 11-28-2016, 07:22 PM
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The counts seems to be an accumulation of offset values from calibrations. I don't know why it goes into the negative, but for whatever reason your car thinks one corner of the car is 700mm underground. But hey, you're doing better than mine which thought I had one corner 20m in the air and one corner 20m underground.

It has been a few months since I did this, but if I recall I placed the system in production mode to prevent any changes in height, then performed one calibration where I manually set the counts to 0 ( if I recall you can calibrate either through height or counts), the performed a second calibration by height (measuring the actual height as instructed).
Then take the EHC out of production mode.
My money is that this will resolve your issue, if your hardware is in order.

Last edited by Beniki; 11-28-2016 at 07:33 PM.
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  #16  
Old 11-28-2016, 08:02 PM
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Quote:
Originally Posted by 4.8iS Le Mans_NZ View Post
Interesting that the fault was traced to a bad alternator.
I've got the same 'SLS inactive' message issue, but no leaking/sagging air springs.
I've suspected low battery voltage may be the culprit as it's pretty sluggish at times if not in daily use.....but maybe I should be getting the alternator tested before replacing the battery?
Just to follow up on this open question - my alternator died not long after posting the above.
Battery was deemed good and the new alternator seems to have solved all the SLS issues.
Cheers.
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  #17  
Old 11-28-2016, 09:46 PM
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Beniki, I just went through the EXACT same scenario with my 06 4.4 with dual axle air suspension. Everything, from the location of the faulty spring, to the snap on obd used to calibrate, and replacement of the level sensors. Replaced the front left strut, then did a recalibration to no avail. The front was completely raised the rear was normal. The level sensor arms were broken so I replaced both. Gave me a code for the front right sensor after I replaced it, so I replaced it with another one and the code went away. Went to recalibrate it because the left side was high and the right side was normal, calibrated it three times with the snap on, first all 4 were high, then the rear was high and the front low, in the end I lowered each axle using the snap on and surprisingly it stayed at that level, so I left it like that. Ride is nice, the height is close to normal, I haven't touched the ride height button yet as I don't want to mess with the level. Gonna order the inpa and calibrate it using that. Hopefully that works out. Thanks for your info.


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  #18  
Old 11-29-2016, 05:55 AM
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Quote:
Originally Posted by Beniki View Post
The counts seems to be an accumulation of offset values from calibrations. I don't know why it goes into the negative, but for whatever reason your car thinks one corner of the car is 700mm underground. But hey, you're doing better than mine which thought I had one corner 20m in the air and one corner 20m underground.

It has been a few months since I did this, but if I recall I placed the system in production mode to prevent any changes in height, then performed one calibration where I manually set the counts to 0 ( if I recall you can calibrate either through height or counts), the performed a second calibration by height (measuring the actual height as instructed).
Then take the EHC out of production mode.
My money is that this will resolve your issue, if your hardware is in order.
Many thanks for your answer. So, if I understand correctly, the procedure is the following, please confirm if you can ():
1) Set the mode to production, as this do not change the height no matter what you change.
2) In production mode, set the counts (that is, introduce the offset value with INPA) to cero in all corners
3) Still in production mode, perform a new calibration with the height. That is, measured and write (the parameter asked in INPA is: enter the deviation from the required height in mm, with the formula: curretn height-requiered height=value to enter) the deviation in that screen. I imagine that even if the value you enter is diferrent from cero ( that is my case, as the car is a bit low in the right front side and left rear) the car will not move as we are in production mode.
4) change to normal mode (out of production)

I imagine, that once this is done, the car will adjust the level it self to the new heights values.

Then, the question is, as now the car is a the right level in each corner, shoul I got back again to production mode and set the counts again to cero?

Many thanks for your help... clearly, this system brings so many problems because people in shops and at home are touching the numbers without a lot of knoledge....
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  #19  
Old 11-29-2016, 09:32 AM
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Sorry, my next question will be. Once the car is set to the right level, is there any way with INPA or DIS (I have both) to deactivate the botton to rise or down the suspension (in the 4 axles ones), other than take out the botton and disconeected from the back the cables?. I do not use this nor undertand very well the reason for, so prefer to disconnet. not sure if the disconnection of the cables will make the system to detect it as a fault.

I also forgot to ask about this... where do you measure the height from: from the floor directly, or from the bottom lip of the rim, or from the center of the wheel, and always to the edge of the wheel well? (I had read different people saying different thigs in different forums)

thanks again!

Last edited by manuelprietou; 11-29-2016 at 10:46 AM.
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  #20  
Old 12-02-2016, 10:56 AM
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Bump for the correct procedure to calibrate suspension via inpa


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