I have a 350hv viper alarm on my Yukon. Just last night when I was trying to lock the truck, the doors didn't lock and the horn didn't go off like it normally does. It sounds like there is no power on the battery. the door locks bearly move and the horn sounds like its dying. I checked the battery and its fine. All the fuses are good. I also tried to disconnect the battery to see if it would reset the alarm but no luck. Thank you for your time, hope you guys can help me.

just unlocking drivers door alarm thinks its been slimmed ---this also works when you use physical key will set alarm off until key into ignition and turn on or use fob to turn off

I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer... rest is up to us.. U get free manuals

Either the system is in valet or, the chirps have been deleted or, the siren is broken.
If the LED is on solid the system is in valet. open the door, press lock, unlock, lock on the remote to remove valet.
Press and hold the lock button. This activates the car finder/panic. The siren should begin to wail. If it does, the siren works. If it doesn't and all you see is the aprking lights flashing the siren is defective.

Contact the customer support at Viper and ask them

for heavy machinery cars etc. luckily there are many websites
that can help you repair
for eg site like reliable-store is very
active in this.. instant help, emails and all that's fantastic
tried and tested !

The Viper alarm (and most other alarms) are designed to be connected to the parking lights.The headlights are not meant to be flashed continuously, as when the alarm is triggered. If you want the headlights to activate with the alarm then, the parking light wire from the Viper needs to be connected to the headlight wire instead. NOT RECOMMENDED.
Although the Viper alarm may or may not have a horn output (you didn't mention the model) ,it can be connected and it can be programmed to sound either when the alarm is triggered or all the time(depending on the model).
By the way, the Driving while Running Lights are seperate from the Sentry Illumination Lights. The Sentry Illumination Lights are designed to illuminate the area in front and around of the vehicle before and after entry. They can be programmed for the time that they will illuminated before and after entry.

The reason your alarm system is going off is because you used a coat hanger to open the door. This only proves that the system WORKS! It simply thinks that you are trying to steal the car - so it is screaming about it to tell on you!

To get the alarm to turn off, close and lock all of the doors (don't forget the keys :) ) Then use the KEY to open the driver's door. This should disarm the system and the security light will stop flashing and the horn and headlams should turn off and everything should be back to normal.

If the led is solid blue when the key is out of the ignition that means your in valet mode. Which would disable the alarm, but not the starter.
Simply turn key to IGN position then back to OFF.Push the valet button which is on the antenna next to the led and the led should turn off.Close door on vehicle and lock vehicle.Siren should now chirp.
Cheers!!

Sorry, but it is my opinion that car alarms are really, really foolish.
Cars are extremely hostile environments for delicate electronics.
Adding alarms is begging for problems that will leave you without a car.
If you lock any valuables in the trunk, out of sight, there is no reason for an alarm. All an alarm will do is either fail and prevent you from driving, or fail and get you a ticket for a false alarm.