I do not believe there is a reset switch. Your year model uses a mechanical valve that is bolted(fixed) to the frame just above the rear axle and it has a pivot arm that is attached to the rear-end.The arm probably came off or broke when the vehicles suspension was raised.You will have to lay under the car and look directly above the center of the rear end and see if the arm is attached .If the arm is not attached you can manually move the arm and adjust the ride height.It may have a ball and socket joint that popped off.Once you determine the arm is not attached you should be able to figure out how to fix it.You may want to go to a shop that can raise the whole vehicle without suspending the wheels and inspect the lever .It is best to raise the rear of this car by lifting the rear end and not the Chassis. Good luck!

__________________
Yahoo!