Principles of Operation

PRINCIPLES OF OPERATION

The power running boards (PRBs) are controlled by the PRB module. The PRB motors receive motor + and - from the PRB module. The PRB module receives the door ajar messages from the controller area network (CAN) bus to determine motor function (deploy or stow).

When in automatic mode, the PRBs will deploy when a door on the same side of the vehicle is opened. When both doors on the same side are closed, the PRBs will retract after a 2 second delay.

When in manual mode, both PRBs will stay deployed until manual mode is deselected or reset to automatic mode and vehicle speed is greater than 8 km/h (5 mph).

When an obstacle is detected, the PRB will reverse direction. If a second obstacle is detected, the PRB will reverse direction again. If a third obstacle is detected, the PRB will stop against the third obstacle until the following conditions are met:
- Change in door ajar status
- Change in the message center status (automatic, out, off)
- Vehicle speed greater than 8 km/h (5 mph)