First post in here (Hi Everyone) and it's a bit of an odd one. I have a 2017 1.4TSi estate, so the facelifted Mk3 (Mk 3.5?). Currently, when I unlock it, the interior lights don't come on anymore. When I open a door, the lights don't come on. When I open a second door, they do. Driver first or passenger first doesn't matter; first door doesn't trigger them, second door does. All the lights are working OK and the door microswitches must also be OK because the red doors appear on the miniscreen as they should and it doesn't seem to be relocking itself (which I've read about elsewhere). It has, just once, opened all it's windows when I wasn't in it, but no other odd behaviour. I can't find a similar query on here so there we are. Anybody got any ideas?

This is one of the strangest one!

16 hours ago, DJFridge said:

 It has, just once, opened all it's windows when I wasn't in it, but no other odd behaviour. I can't find a similar query on here so there we are. Anybody got any ideas?

That's been commented on before a few times, the only suggestion has been that if the keys are in a place (pocket, drawer, etc.) where they can be accidentally pressed for several seconds that will unlock the doors and open the windows, then if a door isn't opened within around 30 seconds the doors will relock leaving just the windows open.

If you think you have a fault, then please find somebody who has an ODBEleven unit or a VCDS unit - to get them to scan your car to see if there are any genuine faults.  The internal lights are all monitored by CANBUS, so any issues will be flagged.

 

19 hours ago, varaderoguy said:

The internal lights are all monitored by CANBUS, so any issues will be flagged.

You sure about that?

 

Many of us have replaced the interior lights with non-CANbus LEDs and had no faults reported - because the general knowledge is that the interior bulbs are not monitored.

Interior courtesy lights are not monitored but under dash,rear boot lights and door lights are all monitored by CANBUS.

16 hours ago, varaderoguy said:

Interior courtesy lights are not monitored but under dash,rear boot lights and door lights are all monitored by CANBUS.

You seem to be the only person saying that any of the interior lights are monitored...

 

It's definitely not my experience -  when I changed both the door lights and the rear boot lights on a 2015 Octavia Elegance to LEDs (with no special 'CANbus' circuitry) I did no recoding and no fault codes or bulb warnings appeared.

Edited 3 December, 20214 yr by PetrolDave

@PetrolDave I suspect the answer is a bit more nuanced.  On my 2019 Octavia Scout, I upgraded the internal footwell lighting to LED lights that @SashaGrace sold to me.  Having done that, the CANBUS network came up and complained about a mismatch of configuration and that the lights were not as configured.  Changing them from Halogen to LED fixed that issue.  In terms of the rear boot lights, again you have to be careful.  If you choose cheap Chinese rubbish lights, then CANBUS will throw an error.  The better LED lights with in-build resistors are far better (such as the Kopacek ones) won't throw any errors. I suspect that if you have a non-facelifted car (2013-2017), there is less monitored.  For Facelifted cars, there are more circuits monitored.