Stimulates the GTPase/ATPase activities of Obg-like ATPases (By similarity). Mediates the transient calcium-dependent interaction of PYR/PYL/RCAR abscisic acid (ABA) receptors with the plasma membrane and thus regulates ABA sensitivity (PubMed:25465408). Binds to PYR/PYL/RCAR abscisic acid intracellular receptors in an ABA-independent manner, both at the plasma membrane and in the nucleus. When associated with disruption in CAR1, CAR4 and CAR9 genes, reduced sensitivity to abscisic acid (ABA) during seedling establishment and root growth regulation. Belongs to the plant CAR protein family.