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IanMetro



Member Since: 11 Sep 2017
Location: Somerset BS21
Posts: 2747

United Kingdom 2014 Freelander 2 SD4 Metropolis LE Auto Fuji White

I found a video of someone having a go at fixing a Land Rover MOST system.

This video gives some easy checks you can do to prove Fibre Optic Ring.
(Note problem was a module power supply in boot-----NOT MOST Ring)

The Infotainment Control Module supplies the master clock to system be working, the rest can be bypassed.
You can shine a light down fibres to prove they work.
Actual FL2 system modules shown in workshop manual.
It appears that there are lots of MOST module/system self checks carried out, which should log Error Codes.
I cannot find anything about the MOST Addressing System, I suspect reprogramming to include the FL2's VIN is only applicable to security sensitive modules. (Has anyone the definitive answer to this?)

In answer to above question about bending fibres. The minimum bending radius is 10 times (or better 20 times) the outer cable diameter.
Think of the light as electro-magnetic waves travelling down a dielectric waveguide dependant on the refractive index presented to it by a straight line fibre/sheath interface.
Bending upsets the refraction and the radiation (light) starts to escape causing losses which suddenly increase as you go below this radius.
Great care must also be taken installing fibre optics as they can be damaged by bending.
It is true that gapping, dirt or misalignment at connections can excessively attenuate signals.



Also how to dismantle the Infotainment Consel (including the MOST connections)

 FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011)
FL2 Metropolis SD4 Auto 2014 2017- (16k - 74k+ miles) (MY2015)

Post #430081 14th Feb 2023 10:34 pm
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Pipes66



Member Since: 12 Feb 2023
Location: UK
Posts: 16

2008 Freelander 2 TD4 HSE Auto Santorini Black

Top video has answered one of my questions. Looking at the MOST diagram you need to follow the arrows not the number sequence.
FL2 dash isn’t in the MOST loop like the RR but I wonder if the hard drive is in the CD player like the RR though. It’s a big heavy unit for just a CD player and as I said earlier it does make a load of computer type noise as if it’s trying to boot up but fails. I say that but I don’t know if a good unit would make the same noise after doing a hard reset removing the metal link in the boot fuse box.
Has anyone else done or about to do a reset?
Is there anyone in West Cornwall that’d let me test their cd unit in my car? 2008 HSE td4

Post #430099 15th Feb 2023 11:09 am
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Pipes66



Member Since: 12 Feb 2023
Location: UK
Posts: 16

2008 Freelander 2 TD4 HSE Auto Santorini Black

Followed the MOST loop as per the arrows on the diagram and all is well.
I pulled the plug on the ICM (fascia with the on/off knob and clock) and there was no light coming from the IHU (cd player) MOST lead, there was a flashing red light in the ICM unit itself and when I lined the plug up with that light source I could see the loop was made and flowing. I suppose this is normal as it appears to start from the ICM and that’s why you chase the light from it : 1,7,6,5,4,3,2,1


 2008 HSE td4

Post #430103 15th Feb 2023 2:51 pm
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grumsel



Member Since: 16 Nov 2016
Location: Heeze
Posts: 278

Netherlands 2012 Freelander 2 TD4 Sport Auto Barolo Black

IanMetro wrote:

I cannot find anything about the MOST Addressing System, I suspect reprogramming to include the FL2's VIN is only applicable to security sensitive modules. (Has anyone the definitive answer to this?)

I don't think the VIN number will be used in the MOST addressing system itself. Devices on a MOST ring can be addressed by position (0x400 + position in the ring), a broadcast address (0x3c8), a group address (0x300 + a group number) or a assigned individual address. Using these addresses messages can be exchanged between devices, these messages are grouped in function blocks. The messages itself are only contain a few bytes of data, to sent more data multi-telegram messages can be used.

Using these messages a check for VIN number could very well be present, don't know if this is done or for which modules. I have read about people exchanging amplifiers, bluetooth modules and satnav dvd player with used devices. I think I read somewhere that you cannot do that with the head unit but I don't know if that was with the front panel or the radio/cd player.

Post #430115 15th Feb 2023 7:42 pm
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Pipes66



Member Since: 12 Feb 2023
Location: UK
Posts: 16

2008 Freelander 2 TD4 HSE Auto Santorini Black

I think I am just going to have to buy a couple of units, I was hoping someone local would lend me them.
Today I spoke to the mechanic who changed the ecu for the PO, he told me he thought it had received a voltage spike.
I read in the archives that Land Rover warned the navigation computer is particularly susceptible to voltage spikes so I think that’s probably where I’ll start followed by the integrated head unit (CD player). Maybe a newer bluetooth module first as I would be buying one anyway, not sure yet.
I think it’s probably cheaper to buy the modules than pay a tech to diagnose. 2008 HSE td4

Post #430116 15th Feb 2023 7:58 pm
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Madmustang



Member Since: 28 Mar 2023
Location: Catsleford
Posts: 12

United Kingdom 2007 Freelander 2 TD4 SE Manual Zermatt Silver

How are you getting on with your problem?

Post #435834 20th Sep 2023 10:24 am
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Pipes66



Member Since: 12 Feb 2023
Location: UK
Posts: 16

2008 Freelander 2 TD4 HSE Auto Santorini Black

Apparently, because the p.o. had to have another dash unit fitted it couldn’t be linked to the stereo and parking sensors at an indy, think they had enough trouble getting a 2nd hand dash to work full stop. Land Rover dealer “might” be able to do it but would probably require a brand new dash which I ain’t paying for. Cars too old, it’s just a runabout really. 2008 HSE td4

Post #435837 20th Sep 2023 3:08 pm
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Nodge68



Member Since: 15 Jul 2020
Location: Newquay
Posts: 1769

United Kingdom 2009 Freelander 2 TD4 SE Manual Rimini Red

I wouldn't consider a 2008 HSE potentially worth a reasonable amount of money too old to be made to work correctly, or maybe I'm in the wrong job. 2009 Rimini Red SE TD4. My daily driver.
Gone. 2006 Tonga Green i6 HSE.

Post #435840 20th Sep 2023 5:05 pm
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