Viper 3901T, 3902T & 3903T - CANBUS - A guide

This product is intended for installation by a professional installer only! Attempts to install this product by a person other than a trained professional may result in severe damage to a vehicle’s electrical system and components.

Arming your system:

You can activate, or arm, the system by locking the doors with your factory keyless entry transmitter. When the system arms, you will hear a short siren sound and see the parking lights flash once. While the system is armed, the status LED will flash about twice a second, showing that the system is actively protecting your vehicle.

What happens if the siren makes a second short sound?

If you hear a second short siren sound after arming, and see the status LED flashing in groups, see Diagnostics section. This extra short siren sound is called Bypass Notification. This means a zone such as a door or trunk is open.

When armed, your vehicle will be protected as follows:

• Light impacts to your vehicle will trigger the Warn Away signal. The system will pulse the horn and flash the parking lights for a few seconds.
• Heavy impacts will trigger the system. The triggered sequence is 30 or 60 seconds of constant siren sounding and flashing parking lights
• If a door is opened, the system will immediately start pulsing the siren and flashing the parking lights. Three seconds later, the siren output changes to a continuous blast. This progressive response gives you time to disarm the system with your transmitter if you inadvertently open the door while the system is armed, while still providing instant response (even if the door is immediately closed).
• Turning on the ignition key triggers the same progressive response as opening a door.
• If equipped, the starter interrupt prevents the vehicle’s starter from cranking. 

To disarm the system, unlock the doors using your factory keyless transmitter. The siren will sound twice, and the parking lights will flash twice. If the siren sounds either four or five times when disarming, refer to the Diagnostics section of this guide. This is called Tamper Alert. 

Valet mode:

You can prevent your system from arming, by using Valet® Mode. This is very useful when washing the vehicle or having it serviced. In Valet® Mode, the system will not arm, even with the transmitter, but all convenience functions (door locks, trunk release, etc.) will work normally. 

To enter or exit Valet® Mode with the integrated LED/Valet® switch: Turn the ignition to “on” position, then turn to “off” position. Press and release the integrated LED/Valet® switch within 10 seconds. The status LED will light steady if you have entered Valet® Mode

Panic mode:

If you are threatened in or near your vehicle, you can attract attention by triggering the system with your transmitter! If your factory keyless transmitter does not have a panic button, this system can be programmed to enable a panic feature (refer to the Programming Options). If enabled, just press the lock button on your factory keyless transmitter twice more than once within three seconds 7 seconds to enter Panic Mode. The siren will sound and the parking lights will flash for 30 seconds. To stop Panic Mode at any time, press the unlock button on your factory transmitter. 

Diagnostics:

If the system is armed with an input active (door open, sensor triggering, etc.) the unit will chirp once when arming and then one more time a few seconds later. This is called bypass notification

Extra disarm chirps are the tamper alert. If four chirps are heard when disarming, the system was triggered in your absence. If five chirps are heard, a zone was triggered so many times that false alarm prevention circuitry has bypassed that zone. In either case, the status LED will indicate which zone was involved (see Table of Zones section). The system will retain this information in its memory, and chirp four or five times each time it is disarmed, until the next time the ignition key is turned on.