Loud interference noise when using 4s with Aux jack for car stereo

I have the same car and same phone, so I'm thinking this might be an iPhone issue. Sorry I don't have a fix but your not alone!!

I'm having exactly the same problem as you in my Audi A4. It's driving me crazy. My iPhone 4 was fine. I've tried various cables. Headphones don't have the issue.

I'm wondering if there's a bad batch out there.

Well I'm going to call apple about it tomorrow and will post with what they tell me.

Same problem here in my G37. My old 3GS worked fine. I really don't understand how a company like Apple - with all the advanced testing that goes on their "black lab" - misses things like this when they test their products. I suppose the antennagate situation could somehow have been overlooked, but can you honestly tell me that not one of their engineers didn't try the 4S in a car or hooked up to an external speaker before release?

Hi all,

I have spoken with the people at Applecare in depth about this issue. After running a couple unsuccessful tests at their request they suggested that it could be the audio connector kit firmware for my 08 Mini Cooper. I will be checking with the local Mini dealer in the morning to see if there are any updates. I will post what I find and let Apple know.

You all may want to do the same thing on your end just to see.

Just to let you know, I used a dock connector in my mates car last night to test the audio. No interference at all. So it's only a fault using the headphone socket.

Interesting, I'm actually having the issue with my two new iPhone 4S's with a dock connector car setup that is the exact same as I used with two iPhone 4's with no issue.

Hi there,

same thing here: iPhone 4S (64GB) with AUX connected to BMW Z4 Coupé with buzzing noise. Interesting, that when stopping the song, the noise disappears after approx. 5-8 seconds, but reappears as soon as I start playing it again.

I have already replaced my 4S in the Apple Store, but still the same problem with the new phone. New cable didn't change a thing! Oddly enough, I didn't face the problem when connecting to my home stereo via 3.5 mm cable. Only in my car I have this noise.

I think it has to do with built-in pre-amplifier. Some have recommended to buy the PocketDock Line Out Mini USB with real line-out functionality from SendStations.

Just got my neighbour to bring his newly purchased 4S over and test it in the car. Exactly the same problem! 😟

So it's a hardware fault...

It's a solution but £32 in the UK for something we shouldn't be spending more money on!

I have the same problem. iPhone 4S using AUX jack in aftermarket Sony stereo. Never had a problem with the 3GS. Turning phone volume up and stereo down reduces the problem a little, but it's still unbearable. I hope we don't have to buy an additional accessory in order to fix this...

I noticed the same problem with connecting to some amplified speakers. The noise starts when the audio starts and goes away a little after pausing. It came back when adjusting the volume on the speakers then went away again.

Agreed!

But at least you get a better sound output, even better than a noise-free headphone AUX.

I have received today the PocketDock Line OutMini USB from SendStations.

I'm using the direct line-out with my AUX cable andit's working fine now with perfect line-out sound without any background noise.Ok, it's quite expensive for a little plastic plug.

But anyway, it is the ultimate recommendation from an audiophile point of view.