I just installed a python 513 remote start and car alarm on my 02 ford explorer. i hooked everything up to the best of my knowledge correctly. i can lock and unlock and set the alarm just fine but my problem is it will not start with the remote. i have went through and double checked all of my wires for good connections. i push the star and nothing seems to act like its working. no dash lights or parking lights come on at all. i cannot hear any relays clicking eather. i have a bypass module and everything so thats not the case. its got to be a miss matched wire or a programming issue. please help me!!!!

SOURCE: car starter not working

look under the dash for a small silver toggle switch....this is a disable switch for the remote start portion of the system..you may have kicked it / bumped it with your foot, causing the remote start portion to be deactivated. Just flip the switch the opposite way and try again..
Also, there may have been a pin style switch installed under the hood...Check to see if it is bent or broken, if it is, simply disconnect it and insulate the wire that was going to it. 
This wire is used as a safety to keep the vehicle from remote starting while the hood is up..to keep people from being injured if the remote start is activated while the engine is being worked on. 
Have whatever shop installed the system replace your pinswitch if that is the problem.

SOURCE: Python 1400XP remote start system

yes you are correct the learn procedure is done by a dei 555L or a 555G bypass module.your car should have one or the other installed on it. simply unplug it,it will be a three wire plug. then plug it back in and then by turning the ignition on and off it will relearn the code.

SOURCE: intermittent arm/disarm of Python model 560XV

this "could" be a bad ground, however, usually when these units lose ground, they activate the siren at a really low level, because they are trying to ground through the siren.

I would say to check where the antenna plugs into the main unit,(brain) but honestly, in 17 years of dealing with DEI alarms, 99.9% of these problems are due to the transmitter - it may blink the LED like it is supposed to, but that doesnt gaurantee it is sending a signal. I would recommend buying a new transmitter and programing it to the brain.

SOURCE: remote starter will not restart my vehicle

If you have an alarm, or remote start with an alarm, you need to press and hold thethe valet button which would be hidden under the dash on the driver side, as you are turning the key sometimes remote starts have a starter disable or an alarm option to reset it that is what needs to be done, some systems even if you dont have an alarm go into a valet mode if your remote battery is old or you never reset it or the alarm kicked in or what have you. if this does not work for you then you will need to bring it to a dealership and have them do a total reset to the computer you can also try disconnecting the negative battery cable, but do this with the door open cause it will reset everything, and google the reset procedure for the key fob (remote).. do that reset for the remote and it should save you money from having to bring it to a shop or dealer.
hope this helps.

SOURCE: Python 990 isnt locking or unlocking my doors .

Its going to be either the wires going to the locks or the programming in the alarm. The only way to tell is to get the wiring tested. A plug could have just pulled out also. Do many variances for one straight answer.