I have a 2012 focus titanium x and have just noticed the number plate light stays on after the engine is turned off and the car is locked. The light is dim until you open the boot or switch on the lights. Any ideas?
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Number plate light
Started by
jondicko
, Jan 16 2021 08:08 AM
5 replies to this topic
#2
Master-of-none
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Clever cloggs
- Vehicle Driven:1.0 125PS Focus Ti
- Location:essex
Posted 16 January 2021 - 12:31 PM
Have you or a previous owner changed the bulbs for LEDs? They can light up with a tiny power drain.
Either
- Install "normal" bulbs
- find LEDs with 'canbus' resistors
- add a resistor in parallel like this video
Weaselling out of things is important to learn,it's what separates us from the animals Except the weasel
#3
jondicko
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Posted 16 January 2021 - 12:47 PM
The number plate light and boot switch are the original part it’s one sealed unit.
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#4
Master-of-none
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Clever cloggs
- Vehicle Driven:1.0 125PS Focus Ti
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Posted 16 January 2021 - 01:51 PM
My bad, you are correct.
Looking at a wiring diagram, it seems the the licence plate light unit has 2 "bulbs" wired in parallel.
If one has failed then the tiny current that the BCM supplies (when off) may be enough to light one LED but not both.
Perhaps try to compare the brightness of your light to another Focus.
Options:
Ignore it
replace it £££ and a fair bit of dismantling (estate but probably similar in part)
wire in a parallel resistor
Cut open the unit and solder in new LEDs
Edited by Master-of-none, 16 January 2021 - 01:53 PM.
Weaselling out of things is important to learn,it's what separates us from the animals Except the weasel
#5
jondicko
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Posted 16 January 2021 - 02:14 PM
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Tried a new switch unit but that one stays on as well.
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- Schmill likes this
#6
Schmill
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Schmill
- Vehicle Driven:2012 2.0 Focus TDCi
- Location:Bedfordshire
Posted 22 February 2021 - 01:58 AM
I have noticed the same problem with mine, also whenever I turn the lights on / off the boot unlocks / unlatches. It's not the switch as I've disconnected that - now wondering loom...
2002 52 5 door Mondeo Ghia 2.0 TDCi 130 Mk32000 X 4 door Focus Ghia 1.6 Petrol 100
2009 59 C-Max Titanium 1.8 TDCi 125 Mk1-Facelift
2012 62 5 door Focus TitaniumX 2.0 TDCi
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