High pitch noise coming from passenger side

antennahead

This is exactly what I have as well, and seems to be the same sound all the
G37 owners were complaining about also. You can't really hear it when the car is running and you're driving, so if this is indeed what he is hearing, he has a much louder version than we do.

John

jpit

Put the ignition switch on (without starting the car) and make sure the car is in gear (manual) and you can hear the noise coming from the engine bay. Putting the car into neutral stops it so that should be a hint as to what is causing it.

Roo

The sound is so high pitched and loud you have no problem hearing it when you are driving at freeway speeds with the radio on.

Roo

Exactly, this is not so much a noise but a ring. Even if you turn the radio up you can still hear the ring since it is a different frequency.

FricFrac

Ok I've been reading this thread and it sounds like there are some vehicles that have some significant noise coming out of them. I think if the people who have the problem state the exact configuration of their vehicle it would be easier to diagnose what is going on. There isn't enough info in this thread to see a common theme....

Is it possible there is some sort of switching power supply in the vehicle? If you add to the electrical load does it get worse/better? (eg turning on all the lights, high beams dome lights - not the stereo though since that would mask the sound levels).

Don't discount an exhaust leak either. They can make all sorts of weird and crazy sounds including whistling, screaching, etc.

__________________
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Aussie-Z

G'Day all from Sydney,Australia:
I am the proud owner of the all new 370Z,only just arrived in Australia just weeks ago.
Unfortunately,I too have the same high pitched noise that some of you guys are experiencingNOT HAPPY!!...the bomb I traded didn't cause me a head ache to drive!!!
I can also confirm that the noise is coming from under the glove box.I know it is not the radio,speakers, GPS, air con., mobile (cell) phone.My Z is auto, right hand drive.Nissan are checking it out tomorrow.Thanks to this site,I know I am not the only one with this prob.Lets hope we can all get it sorted with out too much hassel.

2bits

I have good news. The tech positively identified the sound as coming from the ECU itself. No suprise that the ECU is in the dash behind the glove box.

They have a couple 370's on the lot that could donate an ECU temporarily, but they are 6MT. Unsure if there is any difference in the ECU between 6MT and 7AT, they are playing it safe and ordering a new ECU overnight shipped. I hope to get my 370 back tomorrow, sans high pitched tone.


Roo, I'd add that you should be very disappointed in the techs that looked at your car. Doesn't sound like they tried too hard.

Roo

I am taking your info 2bits to my dealer and having them do it. I leave Sunday for 3 weeks so I'll leave the car with them and tell them I want it fixed.

2bits

Got my car back today, and I consider this issue resolved. The new ECU isn't perfectly silent, but it's good enough. I can hear the sound when the cabin is quiet, but even then it's pretty subtle. The other 99% of the time, I forget about it completely which wasn't possible previously. If I hadn't been so annoyed by the sound over the past couple weeks, I wouldn't be listening for it and probably would never notice.

Good luck Roo and anyone else who get's a bad one. Fortunately, it's an easy fix which only requires removing the glove box and programming the new ECU to work with your existing FOBs.

antennahead

That's great, sounds like there are two different high pitched noises coming from these cars, probably why it has been confusing to isolate. The one from under the engine cover is minimal compared to the discription of the bad ECU.

John

spearfish25

Nice job figuring this out. + rep

wavehogger

I'm not so sure that the problem is 100% truely solved. It may be that like in my car the noise is a little softer at times and then occasionally gets a little more noticable. If changing the ECM didn't totally resolve the problem it could be something else making the noise. Or all the ECM's are going to make the whine, some just more than others. Replacing could be a gamble, where you'll get a quieter one or maybe even louder.

With that said, I took some time today to try and trace it and it seems to be coming from the back of the car, not under the glove box where the ECM is. With my head under there and with the glove box out it's silent under there. I wonder if it isn't the fuel pump since I've heard a few of those whine over the years. They usually sound a little more mechanical and this noise is more sine wave-ish as someone else here said. If it is electronics related, are there any other electrical components in the back that could be making the noise? And maybe there are two noises happening here, and that's just really sad. I'm going in for service Friday and mentioned that I want them to look into it, though if we don't have answers here, they probably won't either, lol.

antennahead

If you definitely have a high pitched noise coming from the rear, then there are THREE noises here, as the one coming from under the engine cover has been heard and confirmed by a variety of members, as well as G37 owners.

John

wavehogger

I'm so laughing, though I shouldn't be. What a whiny little Z. Do we know what is making this whine from under the engine cover?

antennahead

No one actually has said definitively what it is. I can only hear it when I turn the car off, it continues to do it for a few seconds then dies off. It actually doesn't bother me, as you can't hear it when the cars running. The other two described sounds apparantly can be heard over engine and road noise, according to the members with the problem.

John