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The sys light refers to the Chassis Control Module (CCM). It controls all sorts of support functions. I will check my Helms manual to find the way to check the codes.
You can get a manual from http://www.helminc.com. They are about $120.00USC. I cannot image how much in Croatia!
Use a scan tool to check SYS codes, correct? OBDII scan tools can be had at a lot of auto parts stores, for OBDI there is like a key or something you use, it's tiny, someone will have to clarify that as I've never used one before, but OBDII works like a hypertech, just plug it in and read. :cheers: