No light will come out of the sensor lenses. The light beam is invisible. However, if the indicators are not lighting, you should check your wiring to ensure that they are properly connected to the motor unit, there are no staples cutting the wire, or causing a short in the wire, and they have not been pulled out of the back of the sensor. If the sensors and wires are properly installed and in good condition, and you still have this issue, replace your sensors.
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No light will come out of the sensor lenses. The light beam is invisible. However, if the indicators are not lighting, you should check your wiring to ensure that they are properly connected to the motor unit, there are no staples cutting the wire, or causing a short in the wire, and they have not been pulled out of the back of the sensor. If the sensors and wires are properly installed and in good condition, and you still have this issue, replace your sensors.