2003 impala remote start

 ok i have all the wires hook up correctly. for some reason my remote start stoped starting. i replaced a fuse in the remote start realys but i will not start anymore in remote start up. everything flashes doors lock but the motor does not crank. i noticed that for somereason more on the lcd screen the icon that lets u know when the car start comes on even before the motor is runnin. when it was working correctly i always came on after the engine was running. the regular transmitter is not working either. i made sure the care was not in alet mode and reselt the defult settings is ther any thing else i sould look at.

  i installed a sytek remote start in my 2003 chevy impala it was remote starting for a while and then all of a sudden it did not start anymore. i checked all the wires and  and made sure that all of them were installed correctly. there are no blown fuses i ma thinkin it has some thing to do with the inter face module  i have the purple wire going to the ob II adn all the wires r grounded and powered up the the wires from the interface r not used and the passlock wires r not used something is not allowing the car to crank in remote start. when the problem first started the car would stay on in quick stop remote function but now it does not even do that. i checked to make sure that he car was in valet mode adn i reset it to defult settings. before the problems started the key pad light contiuously flashed does any one have any suggestions

  what ia m i supposed to do with the three passlock wires black, white and yellow.