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Old 10-07-2009, 01:54 PM   #16 (permalink)
VCuomo
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Join Date: May 2009
Location: SoCal
Posts: 887
Drives: BMW 335i Sport
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Quote:
Originally Posted by cpehaot View Post
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.
It's the ECU...

BTW, I don't have Nav, but I've heard it at times when my radio isn't on.
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