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AUX interference on 6-CD head unit
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richard22
 


Member Since: 27 Jan 2016
Location: Spalding
Posts: 37

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3
AUX interference on 6-CD head unit

Having replaced my head unit (to get a working CD player), I now also have a working AUX system (sort of.

It will play music from my phone (using a jack to jack) lead fine when stationary (although the volume needs to be turned up pretty load). However, when the engine is running there is a lot of interference and it is 'unlisten-able'.

I don't think it's down to the cable as it's a proper Belkin job. Could it be because the phone is mounted near the radio, or does anyone else have this problem?
 Richard Zermatt Silver  
Post #18987337th Jan 2018 5:42 pm
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ianrichardson
 


Member Since: 31 Aug 2010
Location: Cardiff and Mid France!
Posts: 313

Wales 2006 Discovery 3 TDV6 HSE Auto Santorini BlackDiscovery 3

Richard

The aux input to the head unit is via one of the plugs on the back of the unit.
I would be worth taking the unit out and checking that the plug is fully in.
Taking the unit out isn't difficult.
If you have changed the head unit then you will know how to take the trim surrounding it off.
Plenty of YouTube videos to show you how but basically you grab the sides of the trim surrounding the radio at the top and give it a sharp yank.
It is only held at the top by two clips.
You will now see the screws either side of the unit with the switch panel at the top.
You will need a Torx screw driver.
Undo the top switch panel and lift it out of the way, you don't need to unplug it.
Now undo the 4 screws holding the head unit, you will find it easier to either undo the screws in holding the air conditioning knobs, but you don't need to completely remove the screws just enough to allow the lower panel to move.
There is a tab that locates the head unit and by loosening the lower panel the tab on the head unit can be lifted out easily.
It i really easy just be aware that the head unit is quite heavy!
The plug you need to look at is the middle one, it has a red and black wire going into it. this is the left and right aux in!
There is a third wire, the screen you need to make sure is making a good contact as if this is iffy you WILL get interference!
At this point you can add an extra 3.5mm plug and short cable to the original wires and lead it out at a point to where you keep your phone!
If you don't want to keep the rear jack socket then just cut the wires and solder on your 3.5mm plug and lead.
Job done.
There are plenty of YouTube videos to show you what I am taking about!
This one but it is a low line unit, but there is very little difference!

Hope this helps.
Interference is always due to a bad connection usually the screen lead!

Best

Ian
   
Post #18990418th Jan 2018 5:59 pm
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Sea Raider
 


Member Since: 01 Nov 2016
Location: None
Posts: 4450


I tried to play music from my phone using the aux socket on the back of the centre console and the volume was rubbish.
In an effort to solve this I ran a new aux socket and cabling from the DVD player wiring plug situated behind the plastic trim on the front passenger footwell.
Only other thing that needs doing is to stick an aux plug (from old headphones) into the Aux socket on the rear of the centre console.

Image shows where I located the new Aux socket, fitted a USB socket to allow charging of the phone as well.



This way should I need it, I still have the rear one on the console
  
Post #18990478th Jan 2018 6:13 pm
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ianrichardson
 


Member Since: 31 Aug 2010
Location: Cardiff and Mid France!
Posts: 313

Wales 2006 Discovery 3 TDV6 HSE Auto Santorini BlackDiscovery 3

I don't know whether the level out of the phone is too low as my Audi's Aux input fed from an iPhone is pretty low.
Basically it is down to impedance matching.

The DVD output will be pretty high, whereas the Aux would like that sort of level but no phone will give it!

Richard is suffering interference issues, which on a diesel should be minimal. There is a lot of low frequency RF flying around and I think what is happening is a bad earth somewhere in the Aux cct is rectifying this into interference.

Ian
   
Post #18990998th Jan 2018 9:26 pm
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richard22
 


Member Since: 27 Jan 2016
Location: Spalding
Posts: 37

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Thanks All

I'm not that bothered, but if I have an hour spare on a nice warm day I might pull it out and check the connectors on the back... Smile
 Richard Zermatt Silver  
Post #18992359th Jan 2018 11:25 am
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ianrichardson
 


Member Since: 31 Aug 2010
Location: Cardiff and Mid France!
Posts: 313

Wales 2006 Discovery 3 TDV6 HSE Auto Santorini BlackDiscovery 3

Am I bothered, am I bothered! I said am I BOTHERED!!

Out interest, do you get interference when just selecting /aux without anything plugged in?
Or does the interference only happen when you have your phone, pad or pod plugged in?

Ian
   
Post #18992949th Jan 2018 4:08 pm
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richard22
 


Member Since: 27 Jan 2016
Location: Spalding
Posts: 37

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Hi Ian

Aux sound is fine when the engine isn't running, but I can't remember if the ignition was on or not.

I'm not sure whether the interference is there when nothing is plugged in as I didn't have the volume turned up that loud so I don't think I would have heard it!
 Richard Zermatt Silver  
Post #189960410th Jan 2018 9:51 am
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OldBoater
 


Member Since: 27 Feb 2018
Location: Newark, Nottinghamshire
Posts: 16

United Kingdom 2006 Discovery 3 TDV6 HSE Manual Cairns BlueDiscovery 3

Hi,
I have experienced noise on aux connection when using USB chargers in 12v sockets, especially when the USB ports are close to the radio. Do you lose the noise when you unplug the charger?
Question
  
Post #19210552nd Mar 2018 8:25 am
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richard22
 


Member Since: 27 Jan 2016
Location: Spalding
Posts: 37

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

I'll have to check, but thanks for the tip...
 Richard Zermatt Silver  
Post #19210672nd Mar 2018 8:56 am
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