Hello, you never stop acquiring experience in life. I share one respect to this issue, from which many have found a solution by changing the actuator, (I could not, because I changed it for another new one and there were no changes) occasionally every 10 closes the right rear button remained open.
Some time ago I returned to analyze what electrical difference have in my D1 the two rear actuators with respect to the rest of the actuators. As 1 out of 10 operations the right rear side remained open and the left back side occasionally remained closed.
Knowing the state of all the mechanisms, which I cleaned and opportunely changed each spring when it broke down, I analyzed the electrical diagram, and this is what I found as the only circuit difference between them:
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circuit not NAS, although it is similar)
That is, in addition to the door engine connector, which all have the same, which is at the junction of each door with the body that all have the same, and the common connection point that all engines have to the alarm, the branch of the two rear doors has one more tab, which has just both doors in common. Could this connector make any difference, so that being all the motors connected in parallel from the same point, always these two buttons "fail" first? : roll:
I searched for the location according to the manual. The aforementioned C306 is in the center console below the cubby box. I tried to access it by removing rear ashtray.
You have to have the girl hand, haha! to put it there and take the connector. In the case of my Disco it was not the ugliest thing I saw in my life but I saw it a little dirty, even sulfated.
In a terminal we have copper wire joints with a tin-plated brass terminal, which in turn touches another tin-plated brass terminal and is crimped in copper wire. The presence of ambient humidity in non-welded contacts can allow sulfation in the presence of direct current, which could be evident after several years ... Pressing its trigger and separating the tab, I sprayed both halves then with WD40, moved it a little and I closed everything again.
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Here we can see one end of the chip union that I am referring to, in the case of other D1 it looks impeccable.
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If we operated the automatic doors with this disconnected, tailgate and both front doors would work.
After having done this my problem disappeared! : boing:
In this case also those buttons felt a bit like "slow" and now they are working with the same speed as a whole.
Maybe it is not the problem in all cases but it was so obvious the change that I recommend in case of having random problems with the back doors, do this simple check.
Greetings