Headlight relay location

[Stu284]

Hi guys.

i can’t find the headlight relay on my car. It’s not among the bunch of relays behind the switch for the side lights. Anyone know where it is? Think it’s a 456   

Thanks

[TheClient]

Engine bay, beneath cover besides battery?

[Stu284]

Don’t think it’s there. The only relay in that box is a 370, when removing it, the headlights stay on. Pretty sure it’s a 456

[Breezy_Pete]

Are you certain there actually is a relay?

 

[Stu284]

I can’t say I’m certain, the low beam isn’t turning off and the fog lights aren’t working. Normally when the light switch are at the off position, my day time running lights are on at the front and back and the dash board lights are out, switch to side lights and the drl’s turn of, side lights on, then switch to the final position and the low beam, back lights and dash board light up and I can turn the fog lights on. I’ve tried a new switch with no joy. I’ve been told to try the relay. Can’t find its position after hours of searching the net. But they do sell headlight relays on eBay, relay 456, when I put my car details in, it says, this part fits your vehicle. So I’m assuming there is a headlight relay jammed on. But I’m not certain. 

Checked behind the dash under the steering wheel and the box under the bonnet. 

[TheClient]

Does your car have the coming home / leaving home light function? Might be related with the low beam stuck? or the dipped beam Stalk? Those are the things that come to my mind now.

 

https://www.skoda-parts.com/spare-part/3u0941597a-lamp-relay-with-a-coming-home-function-cz-21013.html

 

Edited 26 November, 2019 by TheClient

[softscoop]

What year is your car?

 

Could be a damaged bcm. I'm fairly sure the headlights are powered directly though the bcm and not via a relay.

[softscoop]

3 minutes ago, TheClient said:

Does your car have the coming home / leaving home light function? Might be related with the low beam stuck?

 

https://www.skoda-parts.com/spare-part/3u0941597a-lamp-relay-with-a-coming-home-function-cz-21013.html

 

I'm fairly sure that is just for a MK1 Octavia.

 

Pretty much everything on the MK2 is controlled with solid state electronics rather than relays.

[TheClient]

2 minutes ago, softscoop said:

I'm fairly sure that is just for a MK1 Octavia.

 

Pretty much everything on the MK2 is controlled with solid state electronics rather than relays.

Yes, you're probably right.  I saw the models applicability was Octavia 1. The year range on some of the derivatives covered to 2010 though!  If  only Oct Mk1 , it dismisses the relay 456 as a possibility. 

Edited 26 November, 2019 by TheClient

[softscoop]

The MK1 was produced until 2010.

 

I've just read your profile and if you do have a 2007 vRS then there won't be a bcm.

 

One thing to check is your headlight switch faulty?

I'm fairly sure that if the car detects it's not working it defaults to leaving the lights on.

[TheClient]

I'm not the OP but it is a 2007 vRS according to profile and he says he has changed the switch.  Was it genuine and new?

[Stu284]

Hi guys, thanks for the help. The car is a 2007 vrs. 

Light are now fixed. 🙌

I spent a bit of time last night unplugging and the putting back every relay I could find one by one. No luck, then I spent ages looking through the net and I found a post a guy had made on here about the fuse box diagram being wrong, so I went back to the fuse board and checked all the light fuse based on that post, found a blown fuse, 🤦‍♂️🙈 now all the lights are working correctly. 

So that drama is over but now my electric window and door mirrors aren’t working🙈🤦‍♂️. Don’t know if I’ve not put a relay back correctly. I’ll have to go and take the dashboard to bits again and check. The only other thing I did was change the glass on the drivers side mirror, would putting the terminals for the heated mirrors on the wrong way round stop the mirrors and windows from working? I’ve checked all the fuses this time, they seem ok. OMG I hope this is a quicker/easier fix to find than the lights 

[Stu284]

Post I found on here

[softscoop]

Ah yes the good old reverse fuse layout.

[Stu284]

Holy f—k, I’m loosing the will to live! 

Revisited all the fuse and relays, all seem fine, windows and mirrors still not working 🤬🤬🤬🤬

[Breezy_Pete]

Check that there is an intact 10 amp fuse in position 12 and a 30 amp one in position 23

 

[TheClient]

Measure the fuse with a multimeter for continuity as well or replace with new anyway...

[Stu284]

Okay dok, I’ll give it a try guys. 

Thanks

[Stu284]

Hi Gents

The plot thickens 

Hope you guys haven’t lost interest yet.

Replaced fuses checked all the relays I was messing around with prior to loosing my electric windows and mirrors  with no joy, still not working. Then I realised today that the passenger side window was working with the passenger side switch. (There’s no electric windows in the rear). I disconnected the battery then reconnected, windows and mirrors worked for a while then failed again. I’ve also now noticed that when they fail, all electrics to do with the drivers door fail, so the interior lights don’t come on when I open the drivers door during fail but they do when opening all other doors in the car, and the light in the bottom of the door on the speaker also doesn’t work during fail. But when I disconnect the cars battery and reconnect it, they all start working again. 

Any ideas guys?

[TheClient]

Mmm. Well by coincidence my rear electric window has started playing up. The switch in the rear door will not properly raise or lower it. As a part of fault finding and reset I removed the 2x 30A fuses for the windows for a couple of hours.

 

When I plugged them back in the rear was still the same (it works from the master switch ok).  But the fronts wouldn’t work at all. I checked fuse with multimeter reinserted still nothing. I pulled it and reinserted a third time and left it a while and now the fronts are all working ok as before. 

 

I didn't notice if the rest of the front door electrics were inoperative whilst the windows would not work. But the initial inoperative state was strange and similar to your experience.

Edited 27 November, 2019 by TheClient

[Stu284]

Wierd!!!

I may start another thread regarding this if I continue to have problems. 

I will have a mess around with the fuses again if it persists. Although, as the passenger side was working from its switch I do feel the problem lies within the drivers door. 

I’ll only have to worry about the fronts, but I assume you were testing/messing around with fuses 23 and 32 from the last picture posted?

Thanks for the reply 

[TheClient]

Yes, fuse 23 and 32 was the ones I removed. Have you tried looking at the wiring that passes from car to door for breaks or chaffed insulation. 

[Stu284]

Cheers 

No, not properly. Just for obvious signs of breaking without stripping to much back. 

If I don’t get anywhere with the fuses and it persists, the drivers door will be getting stripped and properly inspected.

Is yours also a mk2 Octavia?