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Yes there is a low pressure switch next to the muffler on the line as shown below
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This is a .pdf so if you are using a phone or apple product you may not be able to view this and on Windows products you need to have Adobe reader installed.
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This is a transducer that reports system pressure so it does high and low.
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Maybe this description of the system will help you understand how it works
V5 A/C System Description The V5 variable displacement compressor along with the thermal expansion valve on the evaporator, constitutes a largely self-regulating system. There is no pressure cycling switch, no high-pressure cut-off switch and no low-pressure cut-off switch. The compressor clutch is controlled by the electronic control module (ECM), which receives data from various engine systems and from a pressure transducer located in the high-pressure refrigerant pipe. In normal operation, the clutch is engaged continuously. Should one of the monitored conditions become abnormal, the ECM will disengage the compressor clutch until normal operation is restored. These conditions include the following:
The compressor clutch will remain disengaged until normal operation is established.
This is not a CCOT system so it is not a high/low pressure switch but this is a transducer that also controls the condenser fan so it reports to the ECM what the system pressure is.
There is 5 volts on the grey wire, ground on the purple/white wire and a variable voltage on the light blue wire to signal the ECM what the switch is sensing. A scantool is used to see what pressure is in the system.
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There are several reasons the ECM would not enable the compressor. If it thinks the throttle is wide open, if it thinks the engine is too hot or if it thinks charging voltage is low are just three.
Do you have a scantool that will communicate with this car? A Tech 2 with a Suzuki card would be best.
Have you scanned for trouble codes?
You are going to need a scantool that will pull codes, you can at least pull OBD global codes.
Ask your Snappy rep why the Solus won't talk to this car, it should.
Just as a "maybe" you might want to pull the left front fender liner and inspect the wire harness there for corrosion and damage.
If it works cold I would be looking toward available voltage at the compressor connector or the airgap on the clutch.
Have you tested to see if the clutch is being commanded on when it is hot?