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06 STS-V & 06 STS 4 (sold 2016)
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2,747 Posts
Discussion Starter #1
Just curious, does someone know what the sounds are coming from that I hear when I close all the doors and lock the STS? This is with the engine off. It also happens if the doors are closed, but the hood is up and then I close the hood.

I'm sure it's normal, I'm just wondering what the sounds are. They must be electrical. There is a pretty high pitch sort of wine and several clicks.

I'm sure someone on here knows this. Thanks in advance!
 

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2006 STS 1SG & 2007 STS 1SE
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13 Posts
I've reached the conclusion that most of the noises come grom the Nav as it prepares for use.

The high pitched whine seems louder from my wife's 2007 than my 2006. Security/Keyless Entry?
 

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06 STS-V & 06 STS 4 (sold 2016)
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2,747 Posts
Discussion Starter #4
No; I've heard that sound from inside the car and know what you're talking about. I'm talking about pretty loud sounds that are heard outside the car. They sound like they're coming from under the car or under the hood.

It will happen if I try to open a door without the FOB nearby or when I press the lock button on the FOB or, like I said, if I close the hood after the rest of the car is locked.

This is very noticeable, especially in a closed space, like a garage. I'm sure others must do it too.

It reminds me of the fuel pump running or I remember some Lincolns adjusting the air controlled suspension and sounding similar.

It's short; only a few seconds at most.
 

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'95 Fleetwood Brougham and '14 ELR
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212 Posts
Rear air suspension adjusting? My former Fleetwood used to do that periodically.
 

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2008 STS
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20 Posts
Good question. I hear these noises as well. It is definitely from the engine bay. Fuel pressure for direct injection? There is lots going on in there it sounds like. You turn the car off, or if it has been sitting a while, just open the car door and you will hear things begin to whirl, click and buzz from engine bay. Like a living organism.
 

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Cadillac Owners Troll
2019 CT6 Sport 3.0TT,2015 Luxury ATS , 2016 ELR, and Volt
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2,398 Posts
I asked this same question last week in a different thread. I don't have nav, and it seems to come from the doors, trunk, underhood--it's as if something is arming either for the alarm system or keyless entry. I described it more as a "wooshing" but you know how that goes.
 

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Cadillac Technician
none
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11,051 Posts
It sounds like a fuel pump prime to me.
When the door control module gets woken up by the handle or latch it sends out a message and the ECM fires up the fuel pump to make sure the fuel system is ready.
It doesn't really know if you are getting in or out when you close the door.
STS has remote start also (usually) and the hood latch has a switch on it so it would register the same as closing a door.
 
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