Your Car Was Basically a Radar Station: How 1990s Viper Proximity Alarms Actually Worked
If you had a car in the 1990s and cared even a little about it, there's a decent chance it had a Viper alarm. You probably remember the chirps, the blue LED blinking in the dash, and the way the alarm would warn someone just for leaning a little too close. What most people didn't realize at the time was that these alarms weren't guessing. They weren't using simple vibration sensors or pressure switches. They were using a form of radar. That sounds dramatic, but it's not wrong. The proximity sensors used in popular Viper systems were microwave-based motion detectors. They created an invisible field that filled the cabin and extended slightly outside the glass. When that field changed, the alarm reacted. It wasn't infrared, and it wasn't ultrasonic A lot of people assume those old proximity alarms worked like the motion sensors you see today, or like the infrared detectors used in buildings. They didn't. Viper's proximity sensors operated...