↓ Advertise on Defender2 ↓

Home > In Car Electronics > DAB Reception lost when ignition is on
Post Reply  Down to end
Page 1 of 2 12>
Print this entire topic · 
cold



Member Since: 15 Dec 2018
Location: Yorkshire
Posts: 118

DAB Reception lost when ignition is on
Earlier this year I installed a JVC M745DBT double din unit into my 09 Puma - worked ok but DAB reception. Kept dropping. Read on here that there was a fault with earlier models of this unit and fair play to Halfords they swopped it out for a more recently manufactured unit .

So new unit in, DAB when no ignition fantastic, with ignition/engine on ‘no signal’ but FM and Carplay all ok

So checked the threads on here and...

1) Nothing plugged into cig lighter
2) `Tried different aerial that I simply plugged in and attached to roof - same problem
3) Wired neg directly to battery - same problem
4) Change aerial splitter - same problem

Now at a loss, JVC Customer service saying unit has to be ok as works with engine off

Any ideas on what I can try next? - All help appreciated

So at a loss -
Post #793354 16th Sep 2019 3:51pm
View user's profile Send private message View poster's gallery Reply with quote
dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

USB mobile phone charger ? most are switch mode power supply will cores lost radio reception then power up

Last edited by dorsetsmith on 16th Sep 2019 4:21pm. Edited 1 time in total
Post #793356 16th Sep 2019 4:03pm
View user's profile Send private message View poster's gallery Reply with quote
BaronDefenders



Member Since: 28 Jun 2019
Location: London/Cotswolds
Posts: 803

United Kingdom 2004 Defender 90 Td5 SW Santorini Black
Is it possible you’re getting interference from something that only comes on with the ignition? Something along the lines of LED daytime running lights Charlie

1949 Series 1 80 (SOLD)
2002 Td5 90 (SOLD)
2008 Freelander 2 (SOLD)

1958 Series 2 88 Pastel Green (2019 LR Legends Best Restored)
1983 V8 110 Limestone (Previously owned by Tom Sheppard MBE)
2004 Td5 90 Santorini Black (Td5INSIDE Powered & Rebuilt by CSK)
2012 Puma 110 Zermatt Silver (Overlanding Build)

Instagram: @BaronDefenders
Post #793360 16th Sep 2019 4:08pm
View user's profile Send private message View poster's gallery Reply with quote
bpman



Member Since: 21 May 2008
Location: Oslo
Posts: 8069

2008 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black
dashcam?
Post #793366 16th Sep 2019 4:21pm
View user's profile Send private message View poster's gallery Reply with quote
cold



Member Since: 15 Dec 2018
Location: Yorkshire
Posts: 118

many thanks for the replies - DRL’s may be an option, though they do come on in second ignition position (glow plug) and radio works but will do a full test at the weekend - unfortunately no dash cam or USB chargers though. If its not the unit then it must be electrical interference and lights are my best bet.
Post #793388 16th Sep 2019 6:20pm
View user's profile Send private message View poster's gallery Reply with quote
cold



Member Since: 15 Dec 2018
Location: Yorkshire
Posts: 118

It was DRL’s, a couple of RF chokes on the DRL loom and we have a signal - thanks all!
Post #794549 22nd Sep 2019 7:14pm
View user's profile Send private message View poster's gallery Reply with quote
Sulisuli



Member Since: 30 Oct 2016
Location: South west
Posts: 4787

United Kingdom 2015 Defender 90 Puma 2.2 HT Corris Grey
Glad you got that sorted, hope your other repair is a quick one too. 2015 HT XS 90
2008 SVX 90
2000 XS TD5 90
Post #794563 22nd Sep 2019 7:30pm
View user's profile Send private message View poster's gallery Reply with quote
cold



Member Since: 15 Dec 2018
Location: Yorkshire
Posts: 118

Thank you, the joy of Defender ownership, one minute you are stressing over something as small as static as you cant get great DAB reception driving to work....then problem solved you cant drive to work Very Happy Laughing Big Cry
Post #794640 23rd Sep 2019 8:18am
View user's profile Send private message View poster's gallery Reply with quote
Sulisuli



Member Since: 30 Oct 2016
Location: South west
Posts: 4787

United Kingdom 2015 Defender 90 Puma 2.2 HT Corris Grey
Brilliant summary and Im sure we have all felt exactly that Thumbs Up 2015 HT XS 90
2008 SVX 90
2000 XS TD5 90
Post #794643 23rd Sep 2019 8:34am
View user's profile Send private message View poster's gallery Reply with quote
90 Dreamer



Member Since: 13 Jul 2019
Location: Oop North
Posts: 2045

United Kingdom 2016 Defender 90 Puma 2.2 HT Corris Grey
and "stripes"..........you can't forget stripes.......... Razz
Post #794685 23rd Sep 2019 2:33pm
View user's profile Send private message View poster's gallery Reply with quote
carrotbay



Member Since: 18 Aug 2013
Location: Northants, UK
Posts: 694

United Kingdom 2008 Defender 110 Puma 2.4 XS CSW Santorini Black
I've had this issue ever since I've had DRLs. When you say RF Chokes what did you use and where?

Thanks
Post #794690 23rd Sep 2019 3:02pm
View user's profile Send private message View poster's gallery Reply with quote
cold



Member Since: 15 Dec 2018
Location: Yorkshire
Posts: 118

Ferrite Ring Cores - you clip them over the cable as close to the ‘source’ in this case DRL as you can - link to Amazon below - hope that helps

https://www.amazon.co.uk/QPOWER-Ferrite-Su...&psc=1
Post #794691 23rd Sep 2019 3:09pm
View user's profile Send private message View poster's gallery Reply with quote
carrotbay



Member Since: 18 Aug 2013
Location: Northants, UK
Posts: 694

United Kingdom 2008 Defender 110 Puma 2.4 XS CSW Santorini Black
Great .. thanks
Post #794694 23rd Sep 2019 3:19pm
View user's profile Send private message View poster's gallery Reply with quote
custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19449

United Kingdom 
Is there anywhere you SHOULDN'T use the Ferrite chokes? Diesels Lives Matter. ⛽️🛢️👨‍🔧🧰⚙️
And if You Love the Country, then we’re on the same side ~
I got’ love for Britain, I got’ British pride’. 🇬🇧
Post #794713 23rd Sep 2019 5:06pm
View user's profile Send private message View poster's gallery Reply with quote
peanutbob



Member Since: 12 Feb 2009
Location: UK
Posts: 275

United Kingdom 
Resurrecting this thread…I have just collected a 12 plate puma with a Pioneer dab radio. As soon as the headlights are used the signal disappears . The aerial is unfortunately a stick on glass affair, which is not helped as the front screen is heated. But with headlights off it works ok, bar the ott complexity of the Pio unit.
I’m assuming that the cure will be ferrite cores close to the unknown make led headlights?

Thanks
Post #972271 24th Nov 2022 7:05pm
View user's profile Send private message View poster's gallery Reply with quote
Post Reply  Back to top
Page 1 of 2 12>
All times are GMT

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
DEFENDER2.NET RSS Feed - All Forums