Persistent D907 fault

[spitfirebg1]

Hi guys, from some time now I am dealing with various electrical issues with my 2007 30d X5.

I have a persistent CAS K-CAN communication fault error D907. It always says it is "currently present". Besides that, every now and then I get a multitude of K CAN related errors in various modules (JBBF, FZD etc.).

Today I had a strange happening - unlocked the car with the remote but it did not unlock, only mirrors unfolded and blinkers flashed. I saw on the dash the car on lift warning and unlocked the car with the key. It started OK but again, a bunch of errors were stored.

Any idea what might have caused it? went to change the battery this morning, as I suspected it was bad but still, the D907 error persists.

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[ard]

So you changed the battery (with a fully charged battery) cleared the D907 and it is back? (Or never clears?)


I recall quite a few years ago some issues with an intermittent short to metal on bus wiring. Also. ONE bad module can pull down a buss and cause errors in other places. This can be troubleshoot by making educated guesses as to the offending one, disconnecting, then see if you got it...

[spitfirebg1]

The error actually clears when I wipe out the fault memory but comes back. I am yet not sure what makes it pop out - either locking/unlocking the car or else as a few times a tried to monitor when it will pop out (Android DeepOBD app can basically read fault codes in real time) but I was not able to pinpoint something specific.

If you have a knowledge in ISTA, do you know how can I interpret the wake up analysis tool? I checked it yesterday and it says that CAS/FRM woke up the car quite a lot but it also says that when the events are in series, they are probably caused by waking them up by simply locking/unlocking the car, opening doors etc. I am not sure how to tell which wakes up were not supposed to happen.

[spitfirebg1]

It is a wild guess but does the CAS communicate with the CID (CCC screen) somehow or even directly via K-CAN? Because I have Android unit and remember that one plug was left unhooked and recently I removed the unit to inspect the K-CAN wire behind it and it made me an impression that there is a K-CAN wire on that plug which was hooked to the old CCC screen but there was no place to hook it to the Android unit.
Still, as I remember I did not had the D907 fault when I first installed the Android, it started popping out later on.