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The four passenger doors on my X5 E70's central locking system suddenly quit functioning today. This is true whether you use the key fobs or the button in the middle of the dashboard to lock or unlock the vehicle. Not much has changed with the tailboard.

Coincidentally, it also seems to have forgotten my settings for the time and date display, going back to the 12 o'clock clock and the USA date format. I have the impression that these details are probably saved in the user's preferences; for example, when you use a certain key to unlock, it remembers your seat position and other preferences.


The engine will still start with either key.

Because of this, I'm starting to worry if the central locking mechanism has somehow neglected to pair with the keys. Unfortunately, my vehicle just has a push-button start, and most articles I've seen suggest switching the key to the accessories position in order to fix them. Because I think the two are distinct and the starter works, I would like to double-check that I am re-pairing to the central locking system and not the engine.

Just so you know, the back camera has been acting up as of late. On occasion, it displays a useful image; on other occasions, it displays a series of coloured bars; on occasion, it flashes random image fragments; on occasion, it displays a totally blank screen; and on occasion, I just receive an error message stating that the camera has failed.

The camera isn't a huge deal for me, but getting it to function again would be great. However, the central locking not working is really annoying.

I would really appreciate any insights you can provide.

This evening, when I tried to open it with one key, it really did something: the indicators flashed and certain internal lights went off based on whether I was locking or unlocking. The locks just do not function.

First things first, I believe a fault code scan is necessary.

Ok:

Electronics of the junction box A6CF Area Under the Curve Sensor

The car access system's central lock relay has been released (A6D4), locked (A6D5), and the unplausibility of ACK_KL15_Off has been turned off (A126).
Instrument Cluster: A559 KL_30g_f_shutdown; Roof Function Center: A670 BSS failure signal BSS 0xA670
Active Energy Saving Mode on the A811 Reversing Camera; A808 SG Error
Fully automated heating and cooling system
E723 Message (KCAN: Status fitting disc V, 2D1) and E729 Message (KCAN: Status sensor AUC, 2D0) pertain to the 9C55 PTC heaters.
9C7B Front row PTC seats

Sure, I was able to locate fuses 27 and 28 in the front passenger side fuse box after looking for the A6D4 failure code. 28 is blown, 27 is acceptable.

Here I am, back at work.

According to the results of my search, one of the motors being stuck might be the main culprit. I didn't want to remove the door trim, so I changed the fuse in the hopes that I might hear and tell which one was blown. However, nothing changed, and the new fuse is still in place.


At last I gave it another go at reading the error codes and saw some new ones related to central locking; they said something like "value exceeds threshold" but didn't specify which door it was for. After restoring power to the affected module, I noticed that it was reporting an old fault and wasn't attempting to lock or unlock the doors. I cleared the fault codes and tried using the remote again, expecting to find one door that wasn't working, but to my surprise, all of the doors worked perfectly. There was no indication that any of them were stuck.

So, the exact mechanism by which it blew that fuse remains unclear.

Life is full of surprises, my buddy.
Having no idea till the next time (hoping there isn't one) is frustrating when that happens.