Rear wiper stopped working

[Metallo]

Hi All,

After 27 years, my rear wiper stopped working, on both intermittent and regular positions.

No previous sign of slowing down or whatsoever

Here is what I did so far, in chronological order:

1) I checked the fuse (#14), all good there.
2) I disassembled the whole assembly, motor and wiper arm.
3) Tested the connections, and I got 12V on all fronts
4) Disconnected the wiper arm from the motor
5) Re-plugged in the 3 connectors:tested the motor and it spins, both regular wiping and intermittence.

Now, one thing that I hate is to re-assemble everything and pretend nothing happened.
Obviously there is a reason why it stopped working out of the blue, but I simply cannot identify it.

I checked the wiring, but everything looks good, it is all very clean in that area. In fact, I never needed to remove the tailgate interior panel before.

I thought I might take the opportunity to open the motor, clean and lubricate it, but I have no clue how to open it as I see rivets

I attach some images I just took.









For instance, in image one, it seems that the circular clip around the central axis is the one holding the mechanism cover. If you look at image three, the cover is slightly open, which leads me to think that clip keeps that in place.

I cannot find any guide on how to open this motor, do you have any?

Thank you for your help!

Alessandro