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What's behind the little grills in Roof?

Bayou-AllTerrain

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Bayou-AllTerrain Enthusiast

Bayou-AllTerrain

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Not sure what the little grills are located in the roof in the grab handle pockets but my driver side one is making noise. I kept thinking my window was cracked open or not sealing until I tracked it down. I skimmed the manual but didn't see anything about it. It's a 2017 SLT AT 6.2. Any ideas?

 

 

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MikeNH Senior Enthusiast

MikeNH

Posted
Posted

Picture? It might be the location for the climate control temp sensor. It has a little fan that draws cabin air across it. They call it a climate control aspirator.

Colossus Senior Enthusiast

Colossus

Posted
Posted

Bluetooth/On-Star mic is the one right above your head to the left when you are seated in the drivers seat.

Bayou-AllTerrain Enthusiast

Bayou-AllTerrain

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Picture? It might be the location for the climate control temp sensor. It has a little fan that draws cabin air across it. They call it a climate control aspirator.

Sounds like that may be what I'm talking about.

 

This is the driver side. There is one just like it on the pass side as well. dfccf1df928ca90192115f798bb94a9c.jpg

 

 

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sk Senior Enthusiast

sk

Posted
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Definitely the active noise cancellation system. The Onstar/bluetooth mic is to the right of the driver's side sunvisor.

Bayou-AllTerrain Enthusiast

Bayou-AllTerrain

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Definitely the active noise cancellation system. The Onstar/bluetooth mic is to the right of the driver's side sunvisor.

Are you 100% sure on that? I've been told they were something to do with climate control by other people too. Whatever they are they are making noise. [emoji51]

 

 

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2016 Sierra Owner Senior Enthusiast

2016 Sierra Owner

Posted
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Are you 100% sure on that? I've been told they were something to do with climate control by other people too. Whatever they are they are making noise. [emoji51]

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Those have to be the noise canceling mics. I have a 16 SLT 5.3 and those are not present on mine. The small square grille right above your head is the climate control aspirator that controls the system in auto.

 

Here is some more info about the system

 

The main components of the Active Noise Cancellation system are:

3 microphones in the vehicle headliner.

A discrete engine speed (RPM) signal from the engine control module to the amplifier

Active Noise Cancellation electronics and software integrated into the audio amplifier

The vehicle speaker system, connected to the amplifier, to output the desired cancellation frequencies

MikeNH Senior Enthusiast

MikeNH

Posted
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The other folks here have a good point. That has to be noise cancelling. It's exclusive to the 6.2.

TJay74 Senior Enthusiast

TJay74

Posted
Posted

There are 3 of them I believe on the 6.2 truck, one on each side and one in the rear as well. As said they are for the noise cancelation program, only the 6.2 trucks get it along with the BOSE systems.

Bayou-AllTerrain Enthusiast

Bayou-AllTerrain

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There are 3 of them I believe on the 6.2 truck, one on each side and one in the rear as well. As said they are for the noise cancelation program, only the 6.2 trucks get it along with the BOSE systems.

So are they mics or speakers? If they are mics then they shouldn't make noise.

 

 

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Colossus Senior Enthusiast

Colossus

Posted
Posted

I remember when those things in the GMT-800s and 900s that were supposedly for the climate control apparently had a little fan in there to sample the air and it would sometimes be a bit noisy.. was a very common thing and complaint on here many years ago. Not sure if the new trucks have the same things. But noise cancelling sounds nice..

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