Steering Wheel and Column Description and Operation: Motor
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The tilt motor is reversible. For example, the tilt motor moves the column both up and down. When the MSM receives an input to move the column up, the MSM supplies battery positive voltage and ground to the tilt motor in order to move the column up. When the MSM receives a column down input, the MSM 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.