The Sit-N-Lift mobility seat system is a dealer installed RPA and interfaces with other vehicle systems in order to ensure safe operation. The seat may only be operated while the vehicle is in park and the RR side door is open. The seat will operate while the ignition is off or on and with the engine running, but anytime the seat is not in the facing forward locked position the vehicle can not be shifted out of the park position. Power and ground is supplied to the mobility seat system from the passenger power seat at the body harness inline connector C314. The mobility seat system uses a shift interlock relay controlled by the mobility seat control module and connected in parallel with the shift lock control solenoid supply and control circuits through the interface harness. The mobility seat control module prevents seat operation while the transmission selector lever is not in the park position. The park/neutral position switch position switch signal is accessed by the interface wiring harness at the body control module header connector C2. The interface connection to the RR sliding door jamb switch signal circuit is at the switch in the right C pillar. The door jamb switch signal circuit is an input to the mobility seat control module and is used to prevent seat operation while the RR sliding door is closed. The door jamb switch signal circuit is also used for entering and exiting the diagnostic mode. Power to the hand held remote is supplied through the door switch relay which is controlled by the door jamb switch signal circuit. During seat operation the mobility seat module uses inputs from 4 limit switches in order to determine the seat position. The limit switch signal circuits are referenced from battery voltage within the module. The limit switches will open or close the switch signal circuits to ground in order for the module to determine them to be active or inactive. The mobility seat module also monitors an input from a hall effect sensor in the rotation motor for object detection while the seat is being rotated in or out. The hall effect is a 12 volt 3 wire sensor and the signal circuit is referenced from battery voltage within the module.

Rotational movement is controlled by the module using the swivel in and swivel out limit switches while lift movement is controlled using the lift upper and lift lower limit switches. When the seat is in the forward facing position the swivel in and lift upper limit switches will be in an active state. Both of these switches are set up in such a way that when contact is made against the lever the switch contacts will open. When rotate out movement is started pressure against the swivel in limit switch lever will be released and the switch contacts close. During rotation operation the swivel in and swivel out limit switches will be inactive. The control module determines rotation out movement is complete when contact is made against the lever of the swivel out limit switch and the signal becomes active. The swivel out and lift lower limit switches are considered active when the switch contacts are closed. When the rotation out movement is complete and the control module begins lift lower operation, pressure against the lift upper limit switch lever is released and the switch contacts close. During lift operation the lift upper and lift lower limit switches will be inactive. The control module determines lift lower operation to be complete when contact is made against the lever of the lift lower limit switch and the switch contacts close.

Active Switch States