You can't reactivate the system by just adding 12v to the compressor. It would come on but it won't inflate the bags. You'll have to reset the error through computer to get the whole system to work.

BMW X5 4.8iS 2005

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BMW X5 E53, 4.8iS - 2005
Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam
4-Corner Air Suspension - Converted to BC Coilovers