Steering Wheel and Column Description and Operation: Motors
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
Both the tilt and telescoping motors are reversible. For example, the tilt motor moves the column both up and down. When the SCM receives an input to move the column up, the SCM supplies battery positive voltage and ground to the tilt motor in order to move the column up. When the SCM receives a column down input, the SCM supplies battery positive voltage and ground to the same motor, but with a reverse polarity. When the voltage polarity is reversed, the motor runs in the opposite direction and moves the column down.