Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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If they have all quit working with no signal from any this indicates the control unit/ecu has shut them down.This can make it difficult to diagnose manually without a scan tool.In some cases you can visually examine them for any damage to the sensor or electrical connection to the sensors to locate one or more needing replaced but if you do not see any damage physically you will need a scan tool plugged into your vehicle to check for fault codes in the park sensor system as well as to monitor the sensor data to locate the one needing replaced.
In some cases places like Auto Zone might read out fault codes free of charge as I have seen before.
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Unfortunately there isn't a manual way to test or check these here.Even if you unplugged one at a time it would still disable the system making it difficult to pinpoint.
If your scan tool has data display and you can communicate with the park system you might check the sensor data values to see if one shows that something is close to one of the sensors when nothing is actually in range as this would be the one needing replaced.