How to Adjust a Viper Car Alarm

by Paul Saucier
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How many times have you awakened to the sound of your Viper car alarm at 3 a.m., only to find that it was the neighbor's cat jumping on the hood of your car? Or maybe it's a passing garbage truck, or a booming stereo system from the kid down the street. Viper makes great alarms, but like every other alarm on the market, sometimes they just need some adjustments.

Step 1

Find the location of the shock sensor. Start by looking under the driver's side dashboard of your vehicle for a small black or clear box, usually no more than 3 inches square. The exact location of this module depends on where the installer placed it. Although no two vehicles will be the same, Viper recommends using wire ties to secure the module to a large bundle of wires. If the sensor is not easily visible or accessible from underneath the dash, some disassembly of your vehicle may be necessary. Start by removing the knee bolster (the panel under the steering column). The exact processes and tools needed will depend completely on your vehicle.

Step 2

Look for a small knob or inset screw along one side of the unit. This will be the adjustment dial. Using your finger (if possible) or a small flathead screwdriver, turn the dial clockwise to turn the sensitivity up, and counterclockwise to lower the sensitivity.

Step 3

Test the sensor by slapping several areas of your vehicle with a flat hand with fingers slightly spread (do not use a fist, and make sure to remove any rings -- you don't want to damage your car). At minimum, check the sensitivity on the four corners of the vehicle. Adjust the sensitivity again if necessary.

Step 4

Reassemble your vehicle if necessary.

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