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Does the Cateye keep going off? Or not quick enough?


The sensitivity of the sensor is adjustable. While it is not our intent to require adjustments, occasionally it is necessary. Our alarms are designed for the best trade off between quick enough, but not too quick, on most vehicles. Sometimes, however, based on the placement of the sensor during installation, adjustments are required. 

When the Cateye keeps going off (i.e., false alarms), usually the reason is because it is pointed directly at the converter or directly down to the ground. While, most of these scenarios can be troubleshooted by re-positioning the sensor so the majority of its field of view is not obstructed within 12 inches of the sensor "eye", occasionally the sensor will still pick-up radiant heat coming off the hot exhaust immediately after parking. The sensor looks for sustained, uninterrupted movement over a period of several seconds. While radiant heat can be detected by the sensor, it is not consistent enough to sustain a continuous signal like a human body does. Therefore, the sensitivity feature can be prolonged to prevent this type of false alarm. 

The sensitivity adjustment changes the amount of time a continuous stimulus must be detected before siren is activated. The below instructions show how to open the siren box and adjust the sensor to make it less sensitive:



  • The sensitivity adjustment screw is on the Blue Board with the RED DOT inside the control box with the siren. Remove the lid of the siren box to access the Blue Board w/ RED DOT (pictured below). [NOTE: there is a second blue board that does not have a red dot-- DO NOT adjust this board, as it controls the initial chirp.]

  • Every tick mark clockwise will add about 1.5 seconds to the threshold requirement for the alarm to sound. We generally recommend you start by turning the screw 1 tick-mark clockwise (about 1mm of distance):

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