If you get an omhmeter, any open circuit will show infinity or extremely high resistance.
An open circuit means that there is a discontinuity in the circuit preventing the current from passing. It may be a disconnected connector (very easy to fix) or a broken whire (need to replace the whire, or, at least, finding the breakeage and repairing it).
Please note that, even if you successfully correct the problem, the fault will still show. You need to connect the onboard computer to a diagnostic console to reset any and all faults alarms.
Electro
June 2014