Quote:
Originally Posted by cpehaot
If the fuel pump is the suspect, u can check that by turning your car "ON" (not start) the fuel pump should run for a little bit then stop. You can hear if it's the same noise. The bearing on your vent fan can make some small high pitch noise too so make sure u have it/them off.
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It's the ECU...
BTW, I don't have Nav, but I've heard it at times when my radio isn't on.