Hi Milko
Because you let the car in a too hig position, the airsuspension deflatet th system to zero with no effect because he was Jacked up.
Possible failures due this:
-Wrong readings or a mechanical problem of the hight control sensor, please check.
http://lexus-doc.ru/RepairManual1999.php
(Section Suspension an Axle: Inspection/Adjustment)
- High control valves problem for the rear axle (Valves do not close. This can causes the compressor to stop working to prevent overheating or demage)
It is nor easy th diagnose, listen to you car, no need to fire up the engine,is the compressor running, blow up noise from the valves, is there a change in vehicle hight (front or back) during the first 5 minutes (Mesure bevor start, after 2 minutes, after 5 minutes)
Is the compressor after 5 minutes still running, you have a valve or pipe problem.
Step by step
never give up
Regards Tom