I'll assume its a 1.3. There is no reset switch, if its Spanish built then its probably OBD2 and codes can only be reset using an OBD2 scan tool/code reader. If its Japanese then it may be OBD1 and you need to disconnect the battery for a few minutes.
Either way you need to read the fault codes and fix the fault or the light will come back on again.
ECU repairs, modifications and diagnostic interfaces for OBD1 Suzukis:
2006 Jimny, 1.3 VVT, stock
2000 Vitara 1.6 8V, Calmini 3+3, 33 MTs, 5:83R&Ps, remapped ECU
1986 SJ413K pick-up with G16B conversion