Level calibration mercedes Benz w220


Thanks first for your precious advice, i am a new member and sorry for my english, french is my langage

i have a problem with level calibration on my S350 2003 after replacing all struts and airmatic compressor 

When i put the car at desired level, level sensor voltage are out of range then calibration can not be done 

could you mind help me fix It 

iam using a maxidas 808

thanks in advance for your response