IR sensor is not working
Measuring 5V at pin 2 indicates that the IR receiver is not conducting any current, which would suggest that:
a) it is not connected (try re-wiring that portion of the breadboard),
b) it is not being illuminated with enough IR to conduct (maybe the IR transmitter is backwards--try reversing it), or
c) it is broken (try another receiver).

Digital cameras, including ones on cell phones are sensitive to IR. Try using a digital camera to see if the IR transmitter is working. You might have to point the IR LED directly at the camera and possibly turn off the lights in the room. You can test it with a TV remote control that you know works.