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Home > Technical > Number plate lights |
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pab Member Since: 28 Aug 2012 Location: Now in Mid-Wales Posts: 2006 |
The number plate lights aren't fused - they're driven by a dedicated FET (Field Effect Transistor) in the Central Junction Box in the passenger footwell. The wiring goes via a connector in the tailgate which also serves the tailgate release switch - you haven't had that replaced recently by any chance?
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8th Jul 2016 5:06 pm |
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MONGOOSE Member Since: 17 Sep 2015 Location: Norfolk Posts: 12 |
Thanks hugely for your reply, yes the tailgate switch was replaced a while ago it still doesn't work correctly and will only work via the remote, I replaced it myself with a genuine LR part, before that it kept opening itself every time the car was unlocked, I have just lived with using the remote to be honest.
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8th Jul 2016 5:14 pm |
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pab Member Since: 28 Aug 2012 Location: Now in Mid-Wales Posts: 2006 |
I would have a very careful look at the connector and wiring for the tailgate switch and the numberplate lights - a problem there could explain both symptoms. Check (with a multimeter if you have access to one) that the numberplate lights are receiving power at the connector - narrow it down that way.
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8th Jul 2016 6:03 pm |
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MONGOOSE Member Since: 17 Sep 2015 Location: Norfolk Posts: 12 |
Thanks for your help buddy👍👍 |
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8th Jul 2016 6:29 pm |
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Stuartc Member Since: 01 Dec 2014 Location: Perth, Australia Posts: 2292 |
I won't go into a long explanation but I would suggest a hard reset first. If you can't do this via SDD disconnect battery terminals (both), starting with the negative and either leave off for 30 minutes or touch positive and negative together for a couple of minutes. MY15
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9th Jul 2016 12:43 am |
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MONGOOSE Member Since: 17 Sep 2015 Location: Norfolk Posts: 12 |
Thank you for that I may give that a go👍👍 |
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9th Jul 2016 6:10 am |
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dorsetfreelander Member Since: 20 Jul 2013 Location: Dorset Posts: 4354 |
Is that a mosFET or a jFET? Blimey that sounds a bit over the top just to drive a lightbulb. 3 x FL1 2 manual + 1 auto 5 x FL2 4 manual + 1 auto Now Discovery Sport P250 MHEV SE |
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9th Jul 2016 9:37 am |
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Yorky Bob Member Since: 28 Apr 2015 Location: Yorkshire Posts: 4561 |
Get another tailgate lock switch, it comes with the number plate lamps and have it fitted correctly so your lock works. Bet the bulbs do then !
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9th Jul 2016 10:19 am |
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pab Member Since: 28 Aug 2012 Location: Now in Mid-Wales Posts: 2006 |
It's a BTS443 21A if that's any help.
There are something like 12-15 FETs (depending on version) controlling the exterior lighting. I believe it's to do with detecting bulb failures and specifically which bulbs have failed. |
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10th Jul 2016 9:13 am |
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MONGOOSE Member Since: 17 Sep 2015 Location: Norfolk Posts: 12 |
Is there more than one type buddy I didn't realise this? |
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10th Jul 2016 10:32 am |
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Yorky Bob Member Since: 28 Apr 2015 Location: Yorkshire Posts: 4561 |
Is there more than one type buddy I didn't realise this?
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10th Jul 2016 10:47 am |
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MONGOOSE Member Since: 17 Sep 2015 Location: Norfolk Posts: 12 |
Ok thanks, so how do I tell if I have fitted the wrong part then buddy? |
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10th Jul 2016 10:51 am |
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Yorky Bob Member Since: 28 Apr 2015 Location: Yorkshire Posts: 4561 |
Would be pretty obvious, so if you did it yourself you would be aware if it was correct or not immediately.
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10th Jul 2016 11:03 am |
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MONGOOSE Member Since: 17 Sep 2015 Location: Norfolk Posts: 12 |
Yes I fitted it myself and as you say all the plugs etc fitted correctly and I watched a video on it so pretty sure it was the correct part, although it only solved half the problem, it stopped the boot popping by itself but not allowing it to open at the tailgate switch so as you say would lead me to believe there is something before that at fault 😁😁😁, thank you for your help |
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10th Jul 2016 11:09 am |
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