M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8225
  
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ISTR on D3 if anything is plugged into the earphone sockets in the rear the sound from main speakers is silenced, there was at one time a mod for some reason to plug a dummy plug into the rear centre sound outlet can’t remember what for, long shot but worth checking.  It can when others can't,
It will when others won't,
It goes where others don't.
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 3rd Dec 2021 8:57 am |
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Markyc100
Member Since: 30 Nov 2021
Location: Lancs
Posts: 20
  
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No buttons on the steering wheel for phone and when you press the phone icon on the radio it says no phone
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| 3rd Dec 2021 9:07 am |
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Markyc100
Member Since: 30 Nov 2021
Location: Lancs
Posts: 20
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Pete k
I tried letting the car go to sleep and locking it when I unlocked the car the clock comes on and unit lights up but no red light down the MOST so doesn't look like the amp is getting a signal
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| 4th Dec 2021 7:11 am |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10676
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Plug the amp back in.
Now check at the rear of the head unit to see if any red light
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| 4th Dec 2021 9:46 am |
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Markyc100
Member Since: 30 Nov 2021
Location: Lancs
Posts: 20
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Hi, sorry for the late reply. So I've took the radio out and there is no light from the amp on the MOST but when you plug it in at the radio it lights up at the amp side but only on one cable. Will a faulty amp stop my volume knob from working? As when you turn it you don't get the volume up or down on the display and when you select bass, trebble etc they don't adjust also. I am unsure where to go from here?
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| 15th Dec 2021 6:04 pm |
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Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820
 
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You keep asking around in circles tbh..
If the MOST bus is interrupted somewhere, amp, phone, TMC unit, everything else on the MOST bus, functions stop… so also volume on the radio panel… yes… that is normal practice then…
So radio puts out a MOST signal… now you have to look at the other devices on the MOST loop.. till you have found the one malfunctioning…
Some other MOST bus devices are behind the right rear panel in the boot…. If you have the full options or some options installed…. Check them all to be sure Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc. 
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| 15th Dec 2021 6:29 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10676
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Hi, sorry for the late reply. So I've took the radio out and there is no light from the amp on the MOST but when you plug it in at the radio it lights up at the amp side but only on one cable.
I think that sounds ok.
Will a faulty amp stop my volume knob from working? As when you turn it you don't get the volume up or down on the display and when you select bass, trebble etc they don't adjust also.
That is a typical symptom of a failure of the MOST communication. Just need to understand why there is a MOST problem
Regarding the two optical tubes. One is IN and one is OUT. So when you unplug something, it is normal to only see one red light.
As said, the high end models with have 2 units in the rear right of the boot.
A traffic unit TMC
A phone unit
I suspect yours doesn't have these, but its worth ruling it out.
Phone units are problematic.
You can also disconnect the optical cables, and shine a white torch into one end, and then look for a white light at the other end. This proves the orange optics are ok and rules one thing out
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| 15th Dec 2021 7:00 pm |
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Markyc100
Member Since: 30 Nov 2021
Location: Lancs
Posts: 20
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Motolab, thanks.
I know I keep going round in circles sorry. I have no Bluetooth or sat nav/touchscreen display.so from the amp does it go to the tmc in the boot then back to the radio?
Once again sorry for sounding thick
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| 15th Dec 2021 7:07 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10676
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TMC units are usually fitted to cars with navigation and HSE badge
But rip the rear right boot trim back and check
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| 15th Dec 2021 7:09 pm |
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Markyc100
Member Since: 30 Nov 2021
Location: Lancs
Posts: 20
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OK will have a look in the back. If there is no tmc or bluetooth in the boot is it just a loop from the head unit and amp?
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| 15th Dec 2021 7:13 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10676
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Yes. If you have no screen
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| 15th Dec 2021 8:14 pm |
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Markyc100
Member Since: 30 Nov 2021
Location: Lancs
Posts: 20
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All sorted thanks guys, one of the pins going into the amp was corroded a bit. A wicked clean and some wd49 and it's working. Thanks all for your guidance 👍
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| 15th Dec 2021 8:37 pm |
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Markyc100
Member Since: 30 Nov 2021
Location: Lancs
Posts: 20
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Well that was short lived, it worked again for 5 minutes this morning then went off again. Power going to amp and light through MOST to amp.all cables to amp look fine
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| 16th Dec 2021 3:44 pm |
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Markyc100
Member Since: 30 Nov 2021
Location: Lancs
Posts: 20
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Does anyone know any companies that refurb amps or am I best getting one off a breaker? It's not a logic 7 one
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| 17th Dec 2021 9:41 pm |
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aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2463
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Just get a used one there are plenty of vehicles being broken for parts. Andrew
D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE
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| 18th Dec 2021 8:10 am |
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