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Note: This process must be carried out in 8 seconds to access learn mode. Best done with two people. You should have both remotes available or the second one will not work.
Note: Turning the ignition on at any time will cancel the learning process.The system can only store two remote codes and must be done one at a time.If you only have one remote, program it twice.
in that case try doing a full reset by disconnecting the battery cables and clamping them together for 10 mins. Remove both battery leads from the battery then use a nut and bolt or G-clamp to hold both battery lead terminals together.
This discharges any capacitors / memory within the ECU and around the car so ensures all memory settings are wiped clear - back to the factory default.
This will reset all the systems on the car and you may need the radio security code to get it going again, and ensure that the keys are in your hand when you re-connect the battery as the car may lock and turn on the alarm
you will then need to run through te key sync process again