D4 - Speaker Hiss whether started or not

[eddomak]

Hi,

I've just (Tuesday) taken delivery of a 3.0 SE with the most basic (non touchscreen) stereo. I've noticed that with everything in the car off (ie straight after unlocking without touching anything else) there is a low-volume hiss coming from the speakers.

The sound continues as long as the car is unlocked (or at least for 30 minutes when I went back to check). The sound stops upon locking.

Even after starting the car, the stereo, then switching the stereo off, the hiss is still there.

Anyone else experiencing this?


I originally posted this at:
DISCO4.COM • View topic - Speaker Hiss - whether started or not

and GraemeS seems to also have this noise.

I've booked in to have Trivett look at this tomorrow morning.

[ADMIRAL]

Is the vehicle under a metal roof, and 'hissing' due to no radio reception ? Perhaps try it with a CD in the player, and see what happens.

[eddomak]

Admiral - thanks for the suggestion, but that isn't it. Even in the clear, with the radio off, it has the noise. Even with a CD in the player, when turned down low you can hear it in the background.

[ADMIRAL]

Ok. I would go looking for anything that links to the speakers. Initially you can probably assume it is not loose wiring or an accidental short.

What about systems that auto link into the audio system, like the bluetooth setup ? I'm no whiz on this area. Perhaps someone else can volunteer some data.

[eddomak]

I think I'll let the dealer's technicians look for it tomorrow morning. That's what the warranty is for and I don't really feel like crawling and disassembling just yet when the car is so new.

[ADMIRAL]

Yes, that is safer. Be interesting to know what they find out ?

[Graeme]

The hiss from mine is very soft as I can only hear it when crouched down beside the door speaker, although my hearing isn't much good so it may be louder to others. I don't think its a wiring or radio fault, just the amplifier powered-on and maybe some software isn't perfect.

[eddomak]

Well, this morning the lead technician from Trivett Parramatta had a listen and could only just hear it (we were parked on the side of the road in an industrial area with trucks going past...). Though my hearing isn't fantastic (too many hours in a motorcycle helmet + loud exhaust) I could hear it if I put my ear to any of the grilles.

He suspects it may just be noise from the amplifier.

Short story, he says that the software update is coming (MY10 Assurance Program) and may fix partially this issue by shortening the time until the car sleeps. On a side note, for those on that thread, this is coming soon and a letter will be sent out.

If I want to comprehensively test this (which I may do tonight), then:
1) Switch the cabin lights off
2) Open a door or two
3) Wait until the car sleeps (1 hour should do it)
4) Come back and listen to the speaker (don't open one of the closed doors first)

Also I can go into the showroom and see if it happens on their cars.

So it's no deal breaker, but I like my cabin quiet. You can't hear it once you start driving above 40km/hr.

[Neil P]

It'll be a transistor . I doubt they'll wear a new unit , and of course no one
fixes anything these days ........ Noise floors are high in cheap components too.

[eddomak]

I have now tested out waiting until the car "sleeps" and the hiss is indeed gone. As soon as you wake the car up (open a closed door), the hiss returns.