HICAS (/haɪkæs/; High Capacity Actively Controlled Steering) is Nissan's rear wheel steering system[1][2] which was fitted to cars from approximately 1985 to 2010, including models ranging from the Skyline (R31, R32, R33, and R34) and Fairlady Z (Z32) to smaller vehicles like the Nissan Cefiro (A31), Silvia (S13 & S15)/240SX/180SX and Nissan Serena/Nissan Largo. It is also found on models from the Infiniti division, such as the Q45, J30, M45/M35 and G35/G37.
Unlike many other four wheel steering systems, HICAS and Super HICAS are fitted to improve handling rather than just as a parking aid. Disabling or removing HICAS has become a popular aftermarket modification, with proponents citing more predictable steering behavior as an advantage.[3] However, after disabling HICAS, it has been noted that slow maneuvers including parking and quick response steering seemed more difficult.[citation needed]