Help! Remote start stopped working.

[BLUETHUNDER]

Remote start has been working fine till this morning. Two blips on the lock button on the fob should engage the remote start. But all i get is the fuel pump clicking in and then nothing. Trying to unlock the Hummer with the remote fob does nothing. I have to enter the car manually with the key. Inserting the key in to the steering coloum and turning off,and there is a delay of between 5-10 seconds before the engine shuts off. Restarting with the key seems to sort the problem.

Funny thing is,i fitted a pair of l.e.d tailights last night. Surely that couldnt interfere with the circuit?????.

Any help guys.