Principles of Operation

Power Running Board (PRB)

Principles of Operation

The Power Running Boards (PRBs) are controlled by the PRBs (Power Running Boards) module. The PRB (Power Running Board) motors receive motor power and ground from the PRB (Power Running Board) module. The PRB (Power Running Board) module receives door ajar switch status and vehicle speed information from the Controller Area Network (CAN).

When in AUTO mode, the PRBs (Power Running Boards) 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 (Power Running Boards) will retract.

When in OUT mode, both PRBs (Power Running Boards) will stay deployed until OUT mode is deselected, reset to AUTO mode or vehicle speed is greater than 8 km/h (5 mph). Mode will automatically switch back to AUTO once above 8 km/h (5 mph).

When an obstacle is detected, the PRB (Power Running Board) will reverse direction. If a second obstacle is detected, the PRB (Power Running Board) will reverse direction again. If a third obstacle is detected, the PRB (Power Running Board) will stop against the third obstacle until the following conditions are met:

- Change in door ajar status

- Change in the message center status (AUTO, OUT, OFF)

- Vehicle speed greater than 8 km/h (5 mph)