Escort 75 van seat controls?

Hi, I have an Escort 75 van, electric everything, and the drivers seat has two "handles" on it, one in each front corner. One controls the back and forward movement, and I want to know whether the other one should allow you to adjust the rake or height of the seat base as it does nothing, but it does seem to pull on a cable. Does anyone know about this

Dave
April 2010