Hi,
The first thing to check is the fuse in the central junction box. The rear wiper fuse is number 43. If you look at pic 1, I highlighted both the fuse and the rear wiper relay.
First, check the fuse. In addition to checking the fuse, confirm there is power to it. Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
If the fuse is good and has power, then we need to check the relay. If there is a different relay in the box with the same part number, switch them to see if it makes a difference. If there isn't one to switch, here is a link that explains how to test one:
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
Pic 2 below shows the location of the central junction box.
I hope this helps and what you find.
Take care,
Joe
See pics below.
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Sunday, May 2nd, 2021 AT 7:20 PM