my rear wiper won't stop. changed the motor and switch on the column. what is it ?

Bring it to a mechanic

Hello, First, remove the fuse for the heated seats and sunroof (Same fuse, 10A, under passenger dashboard). If the wiper motor stays on, test the gray and dark blue wire for power at the motor for the rear windshield wiper. If either have power, the body control module is likely to blame, and you will want it diagnosed by a professional to prove the cause. If power is at the gray wire, this might be an electrical issue at the rear wiper motor module (on the wiper motor).