Vehicle ramp control system

1. A method of operating a power ramp system on a vehicle to deploy and retract a ramp, comprising:

sensing a ‘door open’ command issued by a vehicle operator;

opening a sliding door on the vehicle in response to the ‘door open’ command;

determining when the sliding door is in a fully opened position

operating a power kneel system to lower a vehicle suspension system in response to the ‘door open’ command only after determining that the sliding door is in the fully opened position; and

activating the power ramp system to deploy the ramp when the door is in a fully opened position, said opening, said determining, and said activating occurring without additional commands by the vehicle operator.

2. The method of claim 1 , further comprising:

sensing a ‘door close’ command from a vehicle operator;

preventing the sliding door from closing in response to the ‘door close’ command;

activating the power ramp system to retract the ramp;

determining when the ramp is in the fully retracted position; and

closing the sliding door on the vehicle only after determining that the ramp is in the fully retracted position, said sensing, preventing, activating, determining, and closing occurring without additional commands by the vehicle operator.

3. The method of claim 2 , further comprising activating a power kneel system to lower a rear suspension system on the vehicle after sensing the ‘door open’ command.

4. The method of claim 3 , further comprising activating the power kneel system to raise the rear suspension system on the vehicle after sensing the ‘door close’ command.

5. A vehicle ramp control system, comprising:

a system controller configured to interface with a power ramp system for a vehicle and also with an OEM vehicle control system associated with the vehicle, said system controller being programmed to operate the power ramp system in conjunction with at least one system controlled by the OEM vehicle control system, wherein said system controller senses current drawn by a motor operatively associated with the power ramp system and stores the sensed motor current for later retrieval; and

a preventative maintenance indicator operatively associated with said system controller, said system controller activating said preventative maintenance indicator when said system controller determines that a preventative maintenance operation is required.

6. The vehicle ramp control system of claim 5 , wherein the at least one vehicle system controlled by the OEM vehicle control system comprises a sliding door operating system.

7. The vehicle ramp control system of claim 6 , wherein the vehicle is provided with a power kneel suspension control system for raising and lowering a vehicle suspension, and wherein said system controller is programmed to coordinate operation of the power kneel system.