X3 Door locks

[Paul Newell]

Hi all. Newbie to the forum. I have a 2018 X3 M sport 2.0D I have set all doors and tailgate to unlock when the engine is turned off. Sometimes they do unlock and on the odd occasion they remain locked. Has anyone experienced something like this before. Thanks in advance. 

 

[X5smw]

Welcome Paul. 
is it all the doors stay locked at the same time or a random one?

my Porsche’s rear right started doing it and it turned out to be the door actuator. 
 

if it’s all at the same time every time, I would look at the relays as it’s giving a signal to all doors. Random 1 door will be getting the signal but failing to actuate

[Paul Newell]

Thanks for the reply. It's passenger and rear doors and tailgate, but only occasionally. I'll look at a replacement actuator and see if that solves the issue. 👍

[Paul Newell]

An update to the intermittent fault. The issue with the passenger door, rear doors and tailgate not unlocking only happens if the radio doesn't turn off when the engine is off and the driver's door is opened!! Very odd. All settings in the idrive are for the radio to turn off and all doors and tailgate to unlock when the engine is turned off and driver'sdoor is opened. Anyone out there who has experienced anything like this? Thanks.

[Greydog]

Hi Paul

I would from that description suspect a Footwell Module or Junction Box fault a diagnostic scan with a good BMW capable system should confirm (Best is BMW INPA/ISTA) 

Dave

[Paul Newell]

Thanks Dave. I have recently had a diagnostic test on the vehicle as there was a fault with the tcu battery, which needed replacing. Would the door unlocking fault have shown during this or not due to it being an intermittent issue? Thanks again for your help

[Greydog]

Hi Paul

As the fault is intermittent it always a mission to track down, INPA/ISTA will show faults present and faults not present but recorded in the history. So if INPA/ISTA was used I would have expected the fault to be seen

Many garages just clear faults then see what comes back (not helpful at times) The fact that your radio seems to be linked to the fault occurrence makes me think the issue is with either the Footwell Module or Junction Box as these modules are the ones that link the two systems (Radio is on the MOST Bus circuit Doors are I believe K-Can)

Dave