There is no reset that does not involve a factory style scan tool. If all remotes stopped working there are a couple modules that could have failed and testing them requires the scan tool as well to watch if they respond to the remotes. If you bought it used from a dealer take it back and have them test it, should be at least a warranty that long on it.
If you bought it privately then you are sort of stuck.
Do the interior buttons work? That would verify if it is the BCM or door modules that were at fault.
Tuesday, February 13th, 2018 AT 7:22 PM