Well it is a fairly late model 2way system so remote start will work if system is in valet mode, however when the system is in valet mode the LED will be on solid for about 1 hour after ign. is turned off, if the LED does not come on when you turn the ign. off, the system is not in valet.
Maybe the LED is N/G, try and take it out of valet, these are instructions for a Viper 7900...
“remote” When exiting Valet mode, the remote control
Notification will be two beeps and the Disarm animation.
Use the following methods to enter and exit Valet mode.
a. Turn the ignition on for 5
b. Turn the ignition off
c. Within 10 seconds press and
release the Valet switch once
d. The led will turn on when
entering and off when exiting
Or you can use the remote...
1. Open any door.
2. Press lock
button, the system will arm.
3. Press unlock
immediately, the system will disarm.
4. Press lock
button immediately, the system will enter/exit Valet mode.
5. The led will turn on when entering and off when exiting
If the above does not work you are going to have to find the alarm brain to get a model number.