Go to the web portal and confirm there is an image for each sensor.

​V4 devices go to:

View Configuration > View Live Stream

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​V1 - V3 devices go to:
​View Configuration > Alert Zones

Check cables for damage - visually inspect all sensor cabling. Ensure cable insulation is in tact, and there are no kinks or bends at any point of the cable. Minimum bend radius is 50mm.

Check all connections - ensure all sensor connectors are properly seated and tight.
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Disconnect and reconnect sensors for good measure.

Reboot the entire system BPU by disconnecting power. Wait for the device to safely shutdown (~60 seconds) before powering up again.

Check that there are fast flashing green lights for all sensors connected to the switch.

If you see one that is not fast flashing, double check it's power connection and try switching to a different port. If it doesn't fast flash in a new port replace sensor.
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Turning the ignition or vehicle key off and then on again quickly will reboot the sensors only.