Operation - Coupe & Roadster

The key fobs are unique to Viper and utilize a rolling code system. The rolling code feature changes a portion of the key fob message each time it is used. The key fob message and the receiver message change together. Under certain conditions with a rolling code system, the receiver and transmitter can fall out of synchronization. By pressing the lock and unlock buttons together, and holding until the horn chirps, the system will resynchronize. The system will take 5-10 seconds to respond with a horn chirp and normal operation resumes. This is not the same as programming a key fob.

The system will accept up to four fob codes and the system can be programmed with either the DRB III or by connecting a programming wire to ground and placing the module in programming mode. If the system is set up for programming, all key fobs for this vehicle must be programmed at the same time. When the module is placed in the program mode, all previous information from the transmitters is erased and no information is written there until the system recognizes a valid key fob. Pressing both lock and unlock buttons on the key fob at the same time will cause the system to respond with a horn chirp after approximately ten seconds. Then any other transmitters may be programmed. There is a time out after 60 seconds of inactivity (no further transmitters recognized). If the system times out, it will have to be returned to the programming mode with the DRB III or by disconnecting and re-connecting the green programming wire located near the module connectors. The DRB "Theft Alarm Monitor Screen" contains information about how many fobs have been programmed and if a valid fob message has been received. The horn chirp feature can not be disabled.

The security portion of the module performs typical security functions. The system can be actively armed by pressing the lock button on the key fob. The system responds with a single horn chirp, if the message is from a valid (programmed) key fob. This information can also be accessed on the VTSS monitor screen with the DRB III. The system will passively arm if the ignition is turned off and the key is removed, the hood and lift glass (coupe) are closed, and while a door is open, the door lock button is pressed. The system will arm immediately upon door closure. There will be no horn chirp.

The security LED will then flash at a 10% duty cycle. The system can be disarmed with a programmed key fob or by inserting the ignition key in the disarm switch. This switch is located in the storage cubby box, when turning the key the system is disarmed. It can only be used to disarm the VTSS, not to arm the system. When the alarm is tripped, the park lamps will flash and the horn will sound, indicating that the vehicle has been tampered with. The alarm can be tripped by opening doors, hood, liftglass (coupe) or turning the ignition on. Once tripped, the alarm will sound for 2.5 minutes. The park and tail lamps will flash for approximately 18 minutes. The PCM will not allow the engine to start. If the EEM has been tripped and 18 minutes have passed, the horn will chirp 3 times upon unlocking with the key fob to alert the driver that a theft condition may have taken place. Normal disarming with the key fob will result in no horn chirps, but will flash the park and tail lamps.