You may not need the wiring diagram.
Until you have pulled both window switches, cleaned the inside contacts,
and.... make sure the correct window wire is plugged into the correct switch.

The connectors can be crossed, this happened to me and my windows did not work.

Luckily the relays and fuses separate the windows diagonally,
front left/right rear and front right/left rear are paired up.
So if both rear work I would guess that your fuse and relay are okay.

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