As already mentioned, a PIC is a micro-controller, in your case the signal will come from the sensor - LA2 is the symbol for a bulb, in your case you would replace the bulb with the LED's.
I suspect the PIR module is a HC-SR501. I have ttached the data sheet for this module and the data sheet for the chip that it uses. I think the maximum output current is about 3 mA. It has a 1K resistor between the output pin on the chip and the output pin on the module.