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DISCO4.COM > In Car Electronics (D3)

no power to sat nav disc player under passengers seat
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Bokko
 


Member Since: 16 Feb 2021
Location: Surrey
Posts: 10

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Baltic BlueDiscovery 3
no power to sat nav disc player under passengers seat

Hello all, this must have been covered many times but I cannot find the exact answer I am looking for. Long story short, I had the dreaded water ingress problem a while back and lost the radio, sat nav etc. I managed to sort the radio/cd player by looping out the MOST on the sat nav screen and the phone transceiver module behind the rear o/s seat. Now that the carpets and everything has dried out I am now trying to sort the sat nav but not having a lot of luck. I have power to the display screen but the screen is completely blank. I do not appear to have any power to the disc player under the passengers seat and I am only guessing but assume if this has no power it affects the screen display, correct me if I'm wrong. Can someone tell me what pin on the disc player should be the power and where does the power come from, and any other info on what the problem could be would be much appreciated. Sad  
Post #222082628th Mar 2021 3:49 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10689

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Do you have good reception on the radio ?  
Post #222082928th Mar 2021 3:52 pm
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Bokko
 


Member Since: 16 Feb 2021
Location: Surrey
Posts: 10

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Baltic BlueDiscovery 3

Yes, reception on radio is all good  
Post #222083128th Mar 2021 3:55 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10689

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

The display should work regardless of the DVD Nav. As a minimum it should display the LR Logo.
Check display pins 1 and 11 have power with the radio on


behind glovebox:
probably ok, but you should check

fuse 53 +12v powers headunit, LCD, Nav
fuse 58 switched: powers LCD and Nav 

Last edited by Pete K on 28th Mar 2021 4:08 pm. Edited 1 time in total 
Post #222083328th Mar 2021 4:04 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10689

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

DVD NAV power pins are 18 and 17 (with the radio on)  
Post #222083428th Mar 2021 4:05 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10689

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Should you need to replace an item consider the D4 upgrade where the display replaces both parts for about £125

Guide on here. A fair bit of work  
Post #222083828th Mar 2021 4:25 pm
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Bokko
 


Member Since: 16 Feb 2021
Location: Surrey
Posts: 10

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Baltic BlueDiscovery 3

Display power ok at pin 1, nothing at 11
DVD Nav power ok at 17, nothing at 18
Fuse 53 ok, nothing at 58  
Post #222084028th Mar 2021 4:28 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10689

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Did you have the radio on ? It’s needed to power those pins  
Post #222084428th Mar 2021 4:42 pm
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Bokko
 


Member Since: 16 Feb 2021
Location: Surrey
Posts: 10

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Baltic BlueDiscovery 3

yes, radio was on  
Post #222084528th Mar 2021 4:43 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10689

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

So there is a command wire that comes out the radio which goes to ground to command the display, nav and Ariel amps up. This powers a relay (that you can’t replace) and then supply’s + to the fuse and accessories.

You could monitor that wire out the radio.
Or even unplug the radio and ground the wire and see if you hear a click and see display power up

If the relay has failed, you could rig up a new external one  
Post #222086728th Mar 2021 6:00 pm
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Bokko
 


Member Since: 16 Feb 2021
Location: Surrey
Posts: 10

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Baltic BlueDiscovery 3

Ok, thanks, I'll give that a go tomorrow. do you know what colour the command wire is?  
Post #222087728th Mar 2021 6:53 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10689

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

thin red wire with blue stripe . Pin 8  
Post #222090328th Mar 2021 9:12 pm
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Bokko
 


Member Since: 16 Feb 2021
Location: Surrey
Posts: 10

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Baltic BlueDiscovery 3

Sorry, took a bit longer to get back on it.
So, grounded red/blue wire from head unit, relay clicked, power at all pins and fuses, display screen displaying, maps working. Happy days!!!
I assume now I just leave the red/blue cable grounded to something and job done?  
Post #222368110th Apr 2021 11:41 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10689

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

You could fit a switch to ground as a work around.

I guess the real fix is a replacement headunit  
Post #222368310th Apr 2021 11:56 am
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Bokko
 


Member Since: 16 Feb 2021
Location: Surrey
Posts: 10

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Baltic BlueDiscovery 3

Ok, so ideally a replacement head unit but as it all works with grounding the wire, what is the downside of just grounding it permanently?  
Post #222369610th Apr 2021 1:54 pm
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