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LR4 head unit stopped working - HELP!!!!!!!!
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aqua0
 


Member Since: 02 Mar 2019
Location: Chorley/Sunderland
Posts: 86

United Kingdom 2011 Discovery 4 3.0 TDV6 Landmark LE Auto Fuji WhiteDiscovery 4
LR4 head unit stopped working - HELP!!!!!!!!

As it says in the title, the head unit on my LR4 has stopped working and won't turn on. I had a low battery warning the other day due to hardly using my car during the last 6 months. Took the car out for a 50 mile run up and down the motorway to stick some charge back into the battery (Lucas AGM under 2yrs old)
Switched off the car and went back 30mins later to see if it was a drain issue that had caused the head unit to stay switched off, but sadly, the unit is still not coming on. Checked both 15a fuses in slots 64 and 65 and they're both working ok. Battery voltage was reading 12.9v.

Anyone else had this issue and if so, how was it resolved?

Thanks
  
Post #218641912th Nov 2020 11:06 am
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Flack
 


Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6224

England 2007 Discovery 3 TDV6 XS Auto Stornoway GreyDiscovery 3

That short run is not enough for a good charge, you need to charge it over night. Make sure your alternator is pumping enough out and that the battery is in good condition.
The screen is one of the first things to not work when low voltage is present.

Also try a hard reset.

Flack Thumbs Up
  
Post #218643012th Nov 2020 12:04 pm
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dewillia
 


Member Since: 04 Aug 2019
Location: Wolverhampton
Posts: 71

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Stornoway GreyDiscovery 4

Try a hard reset has it may have forgot the amp settings etc
  
Post #218644212th Nov 2020 12:45 pm
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aqua0
 


Member Since: 02 Mar 2019
Location: Chorley/Sunderland
Posts: 86

United Kingdom 2011 Discovery 4 3.0 TDV6 Landmark LE Auto Fuji WhiteDiscovery 4

Flack wrote:
That short run is not enough for a good charge, you need to charge it over night. Make sure your alternator is pumping enough out and that the battery is in good condition.
The screen is one of the first things to not work when low voltage is present.

Also try a hard reset.

Flack Thumbs Up


Not being the best when it comes to electrics, what voltage should I be expecting from the alternator and where do I hook up the meter to check, how do I check the battery is in good condition, and finally, by hard reset, I assume you mean disconnect the battery for 1/2hr and then reattach?

Cheers
  
Post #218645712th Nov 2020 1:46 pm
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dewillia
 


Member Since: 04 Aug 2019
Location: Wolverhampton
Posts: 71

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Stornoway GreyDiscovery 4

Hard reset, take battery cables off connect them together for 25 mins than connect back up
  
Post #218646012th Nov 2020 2:01 pm
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Flack
 


Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6224

England 2007 Discovery 3 TDV6 XS Auto Stornoway GreyDiscovery 3

Hard reset how to in Wiki, but 30 secs to 1 min enough.. Have you got a multi meter, do a search on the board, plenty of info on what you need.

Flack Thumbs Up
  
Post #218646212th Nov 2020 2:16 pm
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aqua0
 


Member Since: 02 Mar 2019
Location: Chorley/Sunderland
Posts: 86

United Kingdom 2011 Discovery 4 3.0 TDV6 Landmark LE Auto Fuji WhiteDiscovery 4

dewillia wrote:
Hard reset, take battery cables off connect them together for 25 mins than connect back up


connect together?
  
Post #218646312th Nov 2020 2:20 pm
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aqua0
 


Member Since: 02 Mar 2019
Location: Chorley/Sunderland
Posts: 86

United Kingdom 2011 Discovery 4 3.0 TDV6 Landmark LE Auto Fuji WhiteDiscovery 4

Flack wrote:
Hard reset how to in Wiki, but 30 secs to 1 min enough.. Have you got a multi meter, do a search on the board, plenty of info on what you need.

Flack Thumbs Up


Wiki - as in wikipedia?

Yup - have multi meter, it's the ability to operate it which is lacking Laughing
  
Post #218646412th Nov 2020 2:21 pm
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Flack
 


Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6224

England 2007 Discovery 3 TDV6 XS Auto Stornoway GreyDiscovery 3

Use you meter on the battery terminals check when engine not running, anything below 12.4 or 5 is low, then check again with engine running should be around 14 volts.. meter needs to be on 12 volts DC.

Flack Thumbs Up
  
Post #218646612th Nov 2020 2:31 pm
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Johnny Oxford
 


Member Since: 14 Dec 2014
Location: Chinnor
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United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

https://www.disco3.co.uk/wiki/Home


aqua0 wrote:
Flack wrote:
Hard reset how to in Wiki, but 30 secs to 1 min enough.. Have you got a multi meter, do a search on the board, plenty of info on what you need.

Flack Thumbs Up


Wiki - as in wikipedia?

Yup - have multi meter, it's the ability to operate it which is lacking Laughing
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Post #218646712th Nov 2020 2:33 pm
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aqua0
 


Member Since: 02 Mar 2019
Location: Chorley/Sunderland
Posts: 86

United Kingdom 2011 Discovery 4 3.0 TDV6 Landmark LE Auto Fuji WhiteDiscovery 4

Flack wrote:
Use you meter on the battery terminals check when engine not running, anything below 12.4 or 5 is low, then check again with engine running should be around 14 volts.. meter needs to be on 12 volts DC.

Flack Thumbs Up


Cheers Mick, I'll have a look at it when I get it back from the MOT tester later today (I'm hoping the screen being off doesn't cause an MOT failure issue!) but the voltage when switched off was 12.9v, so I'm taking that as a good sign so far.
  
Post #218647112th Nov 2020 2:39 pm
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aqua0
 


Member Since: 02 Mar 2019
Location: Chorley/Sunderland
Posts: 86

United Kingdom 2011 Discovery 4 3.0 TDV6 Landmark LE Auto Fuji WhiteDiscovery 4

Johnny Oxford wrote:
https://www.disco3.co.uk/wiki/Home


Thanks matey Thumbs Up
  
Post #218647212th Nov 2020 2:40 pm
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Owen1183
 


Member Since: 19 Jun 2020
Location: Stafford
Posts: 35

England 

aqua0 wrote:
Flack wrote:
Use you meter on the battery terminals check when engine not running, anything below 12.4 or 5 is low, then check again with engine running should be around 14 volts.. meter needs to be on 12 volts DC.

Flack Thumbs Up


Cheers Mick, I'll have a look at it when I get it back from the MOT tester later today (I'm hoping the screen being off doesn't cause an MOT failure issue!) but the voltage when switched off was 12.9v, so I'm taking that as a good sign so far.


You'll need to check battery after 30 mins or so after switching off, to allow the voltage to settle. You'll need to drive the car for at least 30 minutes to charge the battery to a reasonable level (alternators generate current, not voltage)
  
Post #218648112th Nov 2020 3:45 pm
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aqua0
 


Member Since: 02 Mar 2019
Location: Chorley/Sunderland
Posts: 86

United Kingdom 2011 Discovery 4 3.0 TDV6 Landmark LE Auto Fuji WhiteDiscovery 4

aqua0 wrote:
Flack wrote:
Use you meter on the battery terminals check when engine not running, anything below 12.4 or 5 is low, then check again with engine running should be around 14 volts.. meter needs to be on 12 volts DC.

Flack Thumbs Up


Cheers Mick, I'll have a look at it when I get it back from the MOT tester later today (I'm hoping the screen being off doesn't cause an MOT failure issue!) but the voltage when switched off was 12.9v, so I'm taking that as a good sign so far.


So, battery is at 12.9v and 14.9v being generated from the alternator. Battery is now disconnected and +ve and _ve clamps wired together. Here's hoping Bow down
  
Post #218671713th Nov 2020 12:26 pm
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aqua0
 


Member Since: 02 Mar 2019
Location: Chorley/Sunderland
Posts: 86

United Kingdom 2011 Discovery 4 3.0 TDV6 Landmark LE Auto Fuji WhiteDiscovery 4

ARRRRGGGGHHHHHH

So, hard reset carried out and still no joy. In addition to the head unit not working, I now have a clock/date that's completely out and I can't do anything about it, and the windows need reprogramming Big Cry

Next step is to replace both fuses - 64 and 65 just in case something is dodgy with them even though they passed the continuity test.

What's the next option folks? Is there an inline fuse leading to the head unit hidden away somewhere?
  
Post #218672513th Nov 2020 1:23 pm
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