Issue with my i30 x-wagon

maunsells

Hi, I am having an issue with my i30 x-wagon. LED bar on back window working fine and but both stop lamps not working(dual stop lamps I might add). Stop lamps have a good earth and tail lamp working, however no power going to the stop lamp pin in the connector. Really strange, I replaced the foot switch, which I thought might be the issue (but was not convinced that it was that) since the LED bar was working. Also a very strange how they wire the tail lamps (dual stop and tail lamp), just two wires going to three poles whereby they have linked the two stop lamp pins. Very stange indeed. Is there something (a module) between the brake switch and the lamps themselves. So so strange, any advice would be appreciated. Have checked all the obvious stuff.

colm_mcm

On a tail/stop there is a shared earth (the outside of the bulb) and then the respective 12v feeds for the stop and tail bulbs.

maunsells

Hi Colm_mcm, thank you for that. Yep the tail and stop lamps do share the common earth alright, then there is a seperate feed 12v feed to the tail (well two tail lamps as there are two duall lamps on LHS and two on RHS), but what is most unusal is the fact that the stop pins in the dual lamps are connected together with no feed to the stop lamp circuit. Most unusual, I had wondered if there was some control box upline of these lamps with some sort of non-conventional drive circuit. In fact this photo should help explain....

Remember: two stop/tail lamps in the enclosure shown.

Black wire is the shared common chassis (0v)
Green wire is the tail 12v + working fine as shoud.
Red wire: Stop filament and yes wired together with NO FEED (WTF) and factory shipped as shown. This is what makes no sense to me.



Boards will not let me post the URL of the image ;-(

biko

Moved out from an old thread

colm_mcm

Are you sure one isn't the rear fog?

maunsells

Thanks Colm, definitely not, but good question. The fog has a separate lamp. I am so frustrated that I cant seem to post a link to a picture of the wiring. Its as if the two stop/tail lamps have a link between the stop lamp pins without a feed from the brake pedal switch. Just bizarre.

Special Circumstances

Put up the URL but with some spaces or something so it doesn't look like a url to the filters


www.this.com/wont/work.html

this .com/probably /will.html

if ya get me

colm_mcm

How many pins are in each connector inside the bulb holders? How many pins are on each bulb?

I would remove all bulbs and try them one by one. If one bulb is in wrong it might cause issues.

You're saying there are 2 parking light bulbs on both sides, do these all work and are the same brightness?


Do you know for certain that the brake lights always worked under your ownership?

maunsells

Hi Colm, thanks for your time on this. Each lamp has outer ground (contact 1), tail filament (contact 2) and stop filament (contact 3). Yep two tail/stop bulbs on each side all at same brightness. Will play around with it a bit more this evening. Thanks for all your help.

colm_mcm

Does the car have a towbar?

maunsells

Thanks Colm,
No tow bar. Very clever with URL

www. dropbox .com/s/ 9u6ddlg0xo3se8q/Photo%2023-07-2017%2C%2020%2030%2013.jpg?dl=0

maunsells

I should add that the two joined in the photo are factory shipped joined like this (except properly done) with crimp and seal. But it makes no sense that there is no wire feeding this stop lamp pair. It does not make any electrical sense. I would have expected a third feed wire from the brake pedal switch. Just remarkable. Black cable is ground (0V) and Green is tale +12v and Red is stop lamp. If I put 12v on to the red circuit the stop lamps work.

Special Circumstances

maunsells wrote: »

I should add that the two joined in the photo are factory shipped joined like this (except properly done) with crimp and seal.

Haha was gonna say the "shpit and twisht" didn't look factory.

maunsells

Defo not factory, done for experimental purposes only. :-). I meant to only skin the insulation but stupidly cut through. I have soldered (gas tight) them since and taped.

colm_mcm

You need to trace the wiring back to the loom that supplies all the brake lights including the or in the window.

maunsells

Thanks will do that. I still dont get how the brake lights function, I strongly suspect that there is a rear lamp module somewhere. Hope it does not go back to the ECU.

maunsells

Thank you Special Circumstances.....

So it turns out Hyundai on the hatch back i30 use 4 stop and tail lamps, however it appears that the STOP filament is redundant and not used. Special Circumstances kindly advised that he/she thought that the brake lamps were the lower ones. He/she was right and when I looked at those single filament lamps, I thought they were fog lamps and the filaments looked intact, however they were obviously open circuit inside. I fitted new single filament STOP lamps and all works fine. Thank you all, problem solved and maybe hyundai should consider labelling the back of the luminaires.

Special Circumstances

They wire them differently for other regions I reckon. Otherwise why put dual filaments in there. So they couldnt label them without having different part numbers for different regions and in that case they would have been as well off to specify bulbs that make sense.

It's a strange one, but you're sorted now anyway. :-)

maunsells

Thanks Special Circumstances, that makes perfect sense too. Its just one of those things....maybe I should be taking a bit more notice of my car to. It just goes to show how often I check my brake lights :-). What are the chances that the two lamps went, probably one first which was probably ignored and the the other went. A series of errors on my part. Thanks for all your help and good advice and to others for their contributions.