Testing switch array with PCIe-6509. High Z mode?

I have a large array of physical switches and buttons to test:

1. Upon closure, each one must be under a certain resistance.
2. Upon release, each one must be over a certain resistance.

I am testing this by placing each line into a PXI matrix switching card which is routed through to a DMM.  The user is prompted to go through the switch array in a predefined order testing each line individually.

However, I would like the end user to also be able to enter a separate "quick test" mode where they are able to press any of the switches at any time and get an indication on-screen that the switch is in reasonable working order.  The idea was to splice every line into a PCIe-6509 as well as the matrix/DMM

However, the problem is that any line on the PCIe-6509 is only 25kΩ with any other.  Is there a way to set all lines to a HI input impedance state so that when the first test is run I can test the actual resistance of the switch in its "open" state not the 25k as seen by the DIO?

Any input would be appreciated.