Yankee_Rover
Member Since: 02 Jun 2021
Location: Seattle
Posts: 183
  
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I’ve come up empty handed with a link, but I recall reading that the Nav screen defaults to showing the LR logo when it’s not receiving an input. May indicate an issue with the MOST (fiber optic) network. The battery reset is a good first step… 2008 LR3 HSE, 4.4L V8
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 22nd Sep 2022 2:17 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8101
  
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OP; you say you have a GVIF, the GVIF is located under the passenger seat, max forward and up and access from rear passenger footwell, the cables that feed the screen are notorious for working loose on the GVIF, check the are pushed all the way home, also the micro switch on the dash that selects the inputs only moves forward one input at a time, in other words the selection is 1-2-3-4and so on depending on how many inputs have been set, when it reaches the max usually 5 it returns to 1-2-3etc, if you have it on an input that is not being used you will get nothing on the screen.
Check the GVIF connections before ripping anything out, also after making any changes the car must go to sleep(brake light off on dash) and engine restarted or switched on.
Bit of interesting reading for you 
https://www.disco3.co.uk/forum/topic53320-15.html It can when others can't,
It will when others won't,
It goes where others don't.
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| 22nd Sep 2022 5:34 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
 
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He says it’s stuck on the lr logo though.
So it’s not getting past start up due to no optical bus activity.
The gvif display has to be in nav mode from memory.
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| 22nd Sep 2022 6:11 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8101
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It won't get a signal if the cable has come loose  It can when others can't,
It will when others won't,
It goes where others don't.
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| 22nd Sep 2022 7:21 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
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The nav unit under the seat only generates the nav display
Home and 4x4 screen is generated within the dash display unit
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| 22nd Sep 2022 7:59 pm |
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BradC
Member Since: 29 Apr 2019
Location: Perth
Posts: 118
 
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As others have said, it's probably the MOST bus.
The Head unit is the MOST master. On power up, the display will show the LR logo and wait for the MOST master to tell it to cancel the logo and what to do next.
There's a doc floating around called DensoSat-Operation.pdf that outlines the communications and initialization process.
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| 23rd Sep 2022 12:50 am |
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