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LASER DETECTOR FALSE ALARMS
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Why am I getting laser alarms when I follow some cars?
- J.J., Michigan
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Red neon is occasionally used for the CHMSL (Center High
Mounted Stop Lamp) on new cars. We know of these models:
GM Trailblazer and Envoy, the Lincoln Mk VIII and the latest
BMW 3-series convertible.
These lights use a neon-plasma light source. The red lens
allows red visible light to pass, and also invisible energy
near infrared. The source is powered by a pulsating voltage
on a frequency that happens to be similar to the repetition
rate of legitimate laser-gun pulse trains. In other words,
the CHMSLs have an invisible energy leakage that’s nearly
identical to the beam used by traffic laser. If we suppress
the interference, we’re likely to damage laser sensitivity.
Another source of alarms: a few new cars have cruise controls
that use laser to measure distance to the car ahead. This
feature is available on the Lexus LS430, Infiniti FX35 and
FX45. This, of course, is real laser, not a false alarm.
If you’re really bothered by these alarms, you can reprogram
V1 to disable its laser reception. It’s a DIY project. Here’s
a link to the instructions on our website: Tech
Report #3
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Questions and Orders 1-800-331-3030 / M-F 9:00 AM to 5:30 PM ET / 10280 Alliance Road,
Cincinnati, OH 45242-4710
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