Weird Electrical Noise W/ignition Off

[ShimanoFisherman]

I went out to update my radar detector this morning and while I was sitting there and before I put the key in the ignition, I heard a weird noise. It sounded like a small electic motor. If I was forced to take a guess, I'd say it sounded like a duct motor for the auto-climate system. But it was also similar to a noisy hard drive. Kinda like the heard moving around a lot.

 

Anyone else ever hear anything like that?

[Metro12]

My guess is its your factory navigation. Mine does it as well. Try hoppig in and putting your ear near the radio, should hear the nav DVD spinning.

[fbachman]

IF you have a factory nav, you may be hearing DVD IO, as indicated.

 

In my case, I DID have an HVAC actuator on the fritz. Caused my HVAC to be locked in defrost eventually... Sounded like an intermittent short, or an electric servo motor going bonkers.

[ShimanoFisherman]

Thanks! I took the Nav DVD out and it stopped.

 

Now the next question would be, should it be doing that? Is it just trying to get a head start when the door is opened?

 

Seems like it's going to be interrupted when the truck is started anyway.

[omegafiler]

Yeah, it's just reading the disc. Mine does that too. Since it's always on, not much you can do about it. If it's working, just ignore it or buy an HDD-based NAV head unit.

[fbachman]

the boss-ladies Enclave does that too. Perfectly normal, it seems.... I suppose it detects the impending engine start via dorr open and starts booting..... probably what it is....

[minibike132]

Thanks! I took the Nav DVD out and it stopped.

 

Now the next question would be, should it be doing that? Is it just trying to get a head start when the door is opened?

 

Seems like it's going to be interrupted when the truck is started anyway.

 

I don't usually post bullitens but this one says to educate the customer so I'm going to make the leap to say it's ok since if you were in the shop I would hand it to you anyway.

 

 

#06-08-44-034C: Information on Noise Sources from Navigation Radio - CD/DVD Disc Accessing Noise from Radio Fan, For Cooling, Disc Accessing Noise for Navigation Operation or NAV Traffic Information - (Jul 31, 2008)

 

 

Subject: Information On Noise Sources From Navigation Radio - CD/DVD Disc Accessing Noise From Radio Fan, For Cooling, Disc Accessing Noise for Navigation Operation Or NAV Traffic Information

 

Models: 2008-2009 Buick Enclave

 

2007-2009 Cadillac DTS, Escalade, Escalade ESV, Escalade EXT, SRX

 

2007-2009 Chevrolet Avalanche, Silverado, Suburban, Tahoe

 

2009 Chevrolet Traverse

 

2007-2009 GMC Acadia, Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL

 

2007-2009 HUMMER H2

 

2007-2009 Saturn OUTLOOK

 

--------------------------------------------------------------------------------

 

This bulletin is being revised to add models, additional characteristics and diagnostics. Please discard Corporate Bulletin Number 06-08-44-034B (Section 08 -- Body and Accessories).

 

--------------------------------------------------------------------------------

 

Some customers may comment that there is unusual fan type noises coming from the navigation radio. Additionally , customers may comment on Radio noise coming from the CD/DVD or MAP Disc mechanisms when CDs/DVDs or MAP discs are present in the CD mechanisms. Some customers have mentioned that radio noise is present when the customer enters the vehicle or that the noise continues after they shut the vehicle off and open the door to leave the vehicle. This noise has been described as a fan sound or hearing a disc spinning.

 

Source of fan sound -- It is normal for the radio fan to run when the vehicle is turned on and for up to three minutes after the vehicle has been turned off and the driver's door has been opened or closed.

 

Disc spinning sound -- This is a normal operational sound. This is caused by the map disc spinning behind the tilt screen. It is a normal operation after the RKE is used to unlock the vehicle or when the driver's door has been opened. This noise will also be heard during vehicle operation and up to three minutes after the vehicle has been turned off and driver's door has been opened and closed.

 

MAP Disc Accessing "ZIP" sound -- As the Navigation Radio accesses the MAP Disc, the customer may describe frequent "zip" type noises. This noise is caused by the CD Read Lens moving across the disc to access needed data for proper MAP display. To determine if the source of the noise is from accessing the MAP Disc, remove the MAP Disc to determine if the noise continues. With the addition of the Real Time NAV Traffic Feature, the MAP CD may be accessed to a greater extent thus resulting in additional MAP Drive noise.

 

Educate the customer about these noises. If the customer believes the noise is not normal, compare the condition to a like vehicle with identical settings to determine if there is a noticeable difference.

 

Do not replace the radio as the described conditions are normal operating characteristics.