Window Autodrop (not one touch) BCM or motor fault?

[Watshot]

I'd noticed that the autodrop was only moving the glass a couple of mil rather than the 10mm it is supposed to drop when opening the doors. Both doors affected the same. Moves back up on closing okay.

 

So tried reset, obviously. No joy. Stripped motors and regulators to check for binding or any other issues. History wise, not touched since new, eight years old, just coming up to 10k, so not exactly worn out. Thought maybe lack of use may be problem hence strip down etc. No issues there.

 

Key point is; it's happened to both windows simultaneously, not sure over what period, which would suggest BCM issue.

 

Anyway, upon testing the motors, it was found that the gear would rotate about 60 degrees when dropping, but 150 degrees when lifting. When in situ, the glass can be 'assisted' to drop to the requisite 10mm position. I would assume that the motor would turn the gear the same amount for both directions as the glass would need to move by the same amount up and down as the door is opened and closed.

 

So, have both motors developed a similar fault at the same time? Unlikely, but easy fix.

 

Or, is the BCM sending a duff signal to both doors even though they are not necessarily used at the same time, and everything else controlled by the BCM appears to work normally? Would a new BCM need Nissan Consult to programme it to the vehicle etc., i.e. megabucks and garage visit........

 

Bit of a specialist one I'm afraid, so the usual "smack it by the speaker" and "have you done a reset?" won't apply.

 

Cheers.