I'm selling my car so I removed my Viper 5901 alarm and now my factory keyfob will not work. I tried using a known good keyfob and that won't work either. I tried the reprogramming process and after the flashers blink twice and I hit a button on the transmitter nothing happens. It's not getting the commands somehow. Could I have disconnected something during the install/uninstall of the alarm?

 

^^ Fortunately it doesn’t happen as you seem to expect. Installing your Viper anti-theft alarm system disables your Nissan Key FOB.

If it was as simple as disabling/removing the Viper and re-enabling the Nissan FOB… What good is your Viper anti-theft alarm/system?

Your next trip is to your Nissan dealership. They can re-establish the FOB’s connection to your car’s receiver.
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EDIT: I forgot to mention this… When you take your car to the dealership, bring both FOB’s and also your Courtesy key. You need to have both FOB’s re-programmed, and the dealer needs the serial number that matches the chip in your car key to the receiver in the car.

--Spike