Weird AUX noise?
 

Anyone know what this really odd noise is when I switch to AUX?

It's not like a ground hum

Link here -

Thank you!

Sounds like interference being picked up on the input. Check for a good ground connection on the 3.5mm AUX plug.

Check with an isolated device like an iPhone etc. that has no charger or anything else connected it to it. Does it still occur? If not, its noise induced by a ground loop and you'll need a ground loop isolator. I fitted one to my car. Cheap as chips on eBay.

Thanks. It's happening with no device connected to the aux input, HOWEVER you can hear the RSE DVD player when it's on aux, I don't know if this by design or not.

So you reckon a ground loop isolator is in my future? :confused_smile:

If nothing is connected then the RSE audio is switched through to the AUX input on the stereo

If the noise happens on the RSE audio, then likely bad switch contacts in the AUX socket (or AUX/RSE switch). Replace one or other depending n what you have.

Ground loop isolator is only for devices connected to the AUX input which are also being charged. Like my Bluetooth adapter, which is always powered on and always connected to AUX

Mine does this too. Cable plugged in but no device, hums like mad. Shuts up as soon as I plug my phone in. Wouldn’t worry about it.

I've looked and looked and can't find an aux switch (to send DVD sound through to the stereo). I've looked in the 'transtunnel' where I CAN find the aux input socket but that's all there is.

Do you also have the CRAZY clicking sound? It's not just the humming/whirring but the clicking that I've never heard before (have owned cars with ground loop problems before, for my sins :sad_smile:)

Open ended cables on sensitive audio inputs ALWAYS pickup noise, on every stereo and sound system i have worked on in the last 35 years.

Don't leave open ended cables hanging around. Terminate them by plugging them into something, or disconnect them.

aha! So that explains why I don't have a switch...

Determine first where the noise is coming from: is it an open ended cable? Is it an earth loop? Is it a bad ground contact in the AUX connector? Is it a bad connection on the AUX loom connector? Or the DVD connector?

Does the noise happen when no connector is plugged in to the aux and no DVD is playing?
Does it happen When a DVD is playing? (put DVD into Pause mode to stop the audio, and just listen for the noise)
Find out when it happens, then you know where the noise will likely come from

If you want to replace parts blindly, do this:
Spray contact cleaner in the AUX socket and work it into the contacts
Spray contact cleaner into the AUX plug connector (you'll need to dismantle first) and mate the connector a few times
Unplug the DVD player and check if the sound changes
Unplug the AUX connector and see if the sound changes
Check for ground loops with Ohmmeter, connecting and disconnecting cable looms along the way
Check for cable loom abrasions especially on shields and grounds

Only once you have exhausted all the cable checks, have cleaned all the contacts, and sure that no ground loop exists, then start replacing parts. I suggest the AUX port first, as it suffers the most wear and tear.

noise problems are almost always ground issues: bad ground, no ground, or ground loop...

Thanks for your help!


Yes:
So I guess first I could try disconnecting the Aux socket and see if the problem goes away?