Running Board Description: Operation

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

A power extend operation will occur with the opening of either the front or rear doors on the assist step on that side of the vehicle. A power retract operation will occur with the closing of both doors on the assist step on that side of the vehicle. A door open/close status switch input is received by the assist step controller through the GMLAN serial data line. The park brake switch and vehicle speed inputs are is also received by the assist step controller through the GMLAN serial data line. The assist steps will be disabled when the disable switch is pushed once. The assist steps will be enabled with a second push of the disable switch.

Each assist step has a bi-directional motor and a hall-effect sensor to detect the position of the assist step. The hall-effect sensors are included with the motor assembly. The polarity on each motor is switched to reverse the direction of assist step travel.