You can follow the procedure to find out pins of any relay.
Apply voltage less than the rated voltage to each possible pair of pins. Whenever you get a clicking sound, those are terminals of the relay coil. Now take multimeter and put it in the continuity mode. Take a pair from the remaining three pins. When you get the beep sound from multimeter, those two pins are normally closed (NC). The last remaining pin forms a normally open (NO) with any one of the pins in NC pair. To find out this common pin, once again apply voltage to the terminals of the coil and find out, with which pin our last pin shows continuity, using a multimeter.
Now you know the coil terminals, common pin, NC pair and NO pair.