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 and modifications for Suzukis http://www.rhinopower.org
2006 Jimny, 1.3 VVT, 2" lift, DD
2000 Vitara 1.6 8V, Calmini 3+3, 33 MTs, 5:83R&Ps, remapped ECU
1986 SJ413K pick-up with G16B conversion