Hello,

I’m having an issue with Coming Home / Leaving Home (CH/LH) lights on my Škoda Octavia Mk4 (2021, MQB Evo).

The function worked correctly before (last year and a few months ago), but now it no longer behaves as expected.

Problem description:

CH/LH does not activate when:

unlocking the car with the remote at night

opening the driver’s door in the dark.

Headlights and parking lights stay off

Only the mirror puddle lights sometimes turn on, often with a delay (≈5 seconds after closing the door), which seems illogical.

Interior lights work correctly when doors are opened.

Door status is correctly detected (door open/closed shows properly in live data).

No fault codes related to CH/LH, doors, BCM or light sensor.

Light sensor shows 0 lux in full darkness.

Vehicle status shows Night Mode = Active.

Previously CH/LH worked in the same parking conditions (street lights, shop parking lots, etc.)

What I have checked / done:

Verified CH/LH enabled in infotainment menu.

Checked Central Electronics / BCM coding and adaptations.

Checked Driver’s Door and Passenger Door electronics, all is correct.

Day/Night mode.

Ambient light values.

IR / Forward light thresholds.

Checked light switch coding and installation list.

No recent BCM update (only infotainment was updated).

Tested with OBDeleven and ThinkDiag

Looked for BAP / menu control channels related to CH/LH

No wiring issues detected.

No relevant DTCs stored

Confusing behavior

Sometimes mirror lights activate late

CH/LH does not activate even though:

Night Mode is active.

Ambient light is 0 lux.

Function clearly worked before with the same conditions.

QUESTION..

Has anyone experienced similar behavior after software changes on MQB Evo?

Is there a known BCM / light logic change that makes CH/LH more restrictive?

Are there specific BAP or CH/LH trigger channels that might disable CH/LH even when everything looks correct?

Should CH/LH still activate under street lighting if Night Mode is active?

Any technical insight is welcome.

Thanks.

Any suggestions?

Probably a daft suggestion, but you say you've checked to see whether they're enabled in the infotainment system, have you then checked the duration for which they're to be activated? Not currently situated in my car but I'm pretty sure that is an option, if you have that set to 0 (or equivalent) then could that be the cause..?

Edited 30 December, 202530 Dec by scotthugh3s

Checked that already – Coming/Leaving Home duration is set to 15 s in the infotainment, so activation time shouldn’t be the issue.

“I’m out of ideas at this point🙂

Given that the infotainment shows 15 s, I’m wondering if the BCM has any separate or overriding timing parameters for Coming/Leaving Home?

And probably just a daft suggestion as well, but what about disabling the setting and leave it off for at least one start/run session and then re-enable it, sometimes just turning things off and on again can fix them. Worth a crack...

I actually haven’t tried that yet yes. 🙂
I’ll give it a try tomorrow, disable it, leave it off for one full start/run cycle, then re-enable it and see what happens.
I’ll report back whether it helps or not.

In the meantime, if anyone has any other ideas, feel free to share them.🙂

Edited 30 December, 202530 Dec by Alo20

I tried that today (disabled it, left it off for a full start/run cycle, then re-enabled it), but unfortunately it didn’t change anything. CH/LH still doesn’t work.

Oeh

Does anyone have any other ideas on what I could check or look into?

I have access to VCDS, ThinkDiag 2 and OBD Eleven, so I can check things with those tools as well if needed.

????