I am using D203B model of PIR and I used the circuit that was suggested on its datasheet (first pic). I do not know what the problem is, as the output (pin the 8 and 14) of op-amp (LM324)is always on (which is connected to the transistor and LED). In fact, It does not react based on PIR output as I disconnected the PIR from op-amp and the output of op-amp was still on. By the way, I have checked LM324 and it was healthy so problem is in my circuit.Here are my circuit schematic and PCB (2nd and 3rd pics). I appreciate you, if you realize the problem.
edit: here is the datasheet file:http://server4.eca.ir/eshop/datasheets/PIR/0404011.pdf