If this is a new home, I think the irrigation is covered for 2 years, call home warranty. If you are lucky, you can call home warranty, and get the name of the company that installed the irrigation piping, they "should" know where the lines are installed.
You can do some investigation yourself. Turn on one zone at a time manually, look at the water meter see how fast it is running, look at all of the sprinklers to see if they are operating correctly, mark any that are questionable. Turn off that zone read the meter again. Try to run each zone for the same time. If you get a really high reading on a specific zone, look there for a leak. My neighbor had a problem right at the box where the flow valves are located, 2 of the 90 degree connectors were defective (on the supply side of course), and leaked continuously. He noticed water and dampness in the garden area, nothing in the lawn.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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