After Locking Headlights Switch On

[Ognilreb]

Issue:
After BSM replacement the headlights switch on & remain on after locking doors.
 
Background:
My Citroen Berlingo, as detailed below, developed a relay fault - it was continually opening & closing very fast as identified by a very noticeable clicking sound & a multitude of fault codes appearing (clearly related to a lack of a good 12V power supply).
I replaced the original BSM with a new recommended updated model BSM.
I cleared all the fault codes & performed a BSI reset.
Everything worked fine in the car until I locked the doors- as the electronics  were ‘settling’ the headlights  flashed intermittently, then once the electronics fully ‘settled’ the headlights switched on & remained on.
 
I have done multiple BSI resets as advised on here & nothing changes.
 
I swapped my original BSM back in & the headlight issue was not there.
Putting the new BSM in just recreates the headlight fault every time.
 
Questions:
Have you replaced a 9675878280 BSM with a 9807028780 BSM?
Did it cause any issues?
 
Have you experienced the issue as described in any other circumstance?
How did you resolve it?
 
Thank you for reading this.

Vehicle:
Year:                  2013
Make:                 Citroen
Model:                Berlingo M-SP AIR XTR E-HDI SA
Engine Code:       DV6DTED (9HP)
 
BSM:
Original BSM part letters/numbers;
9675878280  BSM-R04-00 12/06/13
 
Replacement BSM part numbers;
9807028780

[shtu]

Neo Brothers think so, though the only way to be certain is to check using your VIN.

https://www.neobrothers.co.uk/car-parts/...9807028780

It could be the new unit itself is faulty, sounds like the relays aren't especially reiable,

https://frenchcarforum.co.uk/forum/viewt...hp?t=58203

[Ognilreb]

Neo Brothers think so, though the only way to be certain is to check using your VIN.

https://www.neobrothers.co.uk/car-parts/...9807028780

It could be the new unit itself is faulty, sounds like the relays aren't especially reiable,

https://frenchcarforum.co.uk/forum/viewt...hp?t=58203

It was another site that suggested the replacement was valid & lead me to use it rather than a second hand original....
https://www.eurocarcare.net/bulbs-fuses/...e-box.html
but it is good to see it confirmed elsewhere - thank you. 

I think the fact my original, but faulty in another way, unit does not replicate the light error suggests I do not have any of the issues as described on the FrenchCarForum link.

Do you know where I can get a confirmation of compatibility through my VIN as described on the link?
I will sign up & see if the poster is still active & able to do that for me in the meantime. 

Thank you.

[Ognilreb]

I can confirm a 9675878280 BSM R04 cannot be replaced with a 9807028780 BSM on a 2013 Citroen Berlingo (despite the fact it is claimed to be a suitable replacement).
I state this because I tried two brand new 9807028780 BSMs from different sellers & they both produced the same fault as previously described.
I then purchased a second hand 9675878280 & everything is now working fine.

Of course there could have been a batch issue meaning two 9807028780 were faulty, though that seems unlikely as they were 'stickered' differently suggesting different batches or even manufacturers.
Until someone confirms otherwise I advise only replacing like for like; or at least making sure you have a strong return option if trying the supposed alternative.