I can't start my truck I have a 5701 viper. When I hit the start button the red light at the f button comes on for about a second. Please help

SOURCE: viper 5701 remote

read the owners guide look at page 11 remote control programing you have to follow the instructions after your in the programing mode go to page 12 look at the unlock symbol and finish the programing

SOURCE: viper alarm keypad will beep for 30 seconds every time I arm or disarm

Change the battery, 2-way remotes require 2 slim batteries on top of one another. Regular remotes only require 1.

SOURCE: How do I lock my keypad

there is a way to do it in the manual which can be found at www.viper.com/support.... i did it by mistake and now can't figure out how to turn it off

SOURCE: how to program viper 5701 remote

Unlock doors
Push and hold f button for 8-10 seconds until amber light is on solid
Push Remote start button for about 4 seconds till amber light flashes 3 times
Put key in to IGN position
Push valet (black button) one time and release
Push and hold valet button
Push either lock or unlock on viper remote
Key out of IGN
Test unit
The horn or siren may sound afterwards to indicate SUCCESS!!!!!!

SOURCE: My Viper 5701 2 way

I see your problem and it is a shame it should cost so much to press a few buttons. How about you look at the below link and see if you can access the guides to reprogram your remote.

http://support.directed.com/RemoteGuide/

There is a lot of info on this web page and I think you should be able to get it working again and thanks for using FixYa.