2005 Dodge Viper Owner's Manual - Page 19

THINGS TO KNOW BEFORE STARTING YOUR VEHICLE 19 Transmitter Battery Service The replacement battery number is 2016. This is a generic battery, readily available at local retail stores. 1. Pry the transmitter halves apart with a coin or similar object. 3. Reassemble the transmitter case and test operation. NOTE: If the transmitter is operated more than 255 times out of range of the vehicle (23 feet or 7 meters) or when the vehicle battery is dead, it may become "out of synch". The result is that the transmitter will not function. To correct this condition, remove the key from the ignition and close the hood and all doors. Press both buttons on the transmitter for about 10 seconds. The horn will chirp once to acknowledge the signal. Normal transmitter operation should resume. 2 Separating Transmitter Halves 2. Remove and replace the batteries.