On SOME of these ELC/ALC (Electronic/Automatic level Control) models the height sensor(s) are slightly adjustable. The car should normally carry a tiny, barely perceptible forward rake.
The sensor arm may have an adjustment locknut, or some have altered the length of the sensor link rod(s). The bladders on the shocks are not separated as to side-to-side: Air goes to / vents out of both bladders simultaneously.
To test the system, turn the Key: ON. After about 8 seconds the compressor should do a quick preload/prove-out. OK ? Pop the trunk and get 2 assistants. All sit on the trunk lip - the system should again level the rear. OK ? All jump off and you listen in the RR fenderwell for escaping air as the system again levels the rear. OK ??? Good to go.
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Base model you can adjust yourself. Use the post Submariner409 sent you. Loosen the 10mm bolt and push up on the inside plastic part of the sensor, so it’s even with the metal lever. That will give you about 3 to 4 inches at the rear bumper.
If you have Mag ride, you need a tech II to adjust it.