the other option is that the bypass module (not sure how the oem ones are setup) may not be programmed any more. without reading the chip the starter may not engage (or will engage but just crank and not start. could also be a part of it is not hooked up or not workin properly. see if a local guy or shop can take a look at it.
if you wana test for the chip, put the key in the ignition (don't turn) and then try to remote start it. if it works then it's the bypass, if it still doesn't start then it's somethin else.
2010 Volvo C70
2011 Harley FLHTK
Midwest Crew #22