it might be all you need to solve the problem.i would also check the FOB batteries also. i recently had an issue where one of the batteries was stone cold dead and the other held a full charge. results, the FOB wouldn't work and had to be reprogrammed (a simple task)once i changed the batteries. since you set off the alarm,i would think that you would need to clear that and if the FOB is inoperable,you are out of luck. it's certainly easy to check battery voltage with a meter to see if they need to be replaced. BTW, my situation, both of the original batteries were installed at the same time, brand new less than a year ago.if in fact batteries need replacing, after installing them, insert you key in the ignition, press either one of the buttons (lock, unlock) twice quickly,, and turn the key to the on/start position within 30 seconds (don't start the engine) thats it