Is the light in the lower right hand corner of the button on? In "REST" mode, that light comes on, you can simply press the button to turn it off.

Now, if the light wont' go off, try Ron's suggestion, that is, observe if the button is stuck in the "down" position. If so, try to get it to let go.

If the light is not on, I doubt it's the "REST" function at all. If the "blower motor resistor" fails, one of the failure modes is that the blower will run all the time. This is a very common issue.

The REST module is the climate control module as a whole, there is no separate REST module.