Hi,
This could be something as simple as a fuse. So, that is where I would like to start.
If you look at the pics below, I attached the wiring schematic for the wiper circuit. Additionally, I highlighted three fuses that need to be good. Check the fuses first. If they appear good, confirm there is power to them. All three of these fuses should have power to them regardless of the ignition key position.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
If you look at pic 3, that is the fuse in the interior fuse box. Pic 4 shows the fuses and relays related to the wipers. Pic 5 identifies the relays.
You mentioned relay 6 being missing. If you check closely, there shouldn't be any connector pins in that spot.
If you want to check the relays, here is a link that explains how it's done:
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
Let me know what you find. Note: If all fuses test good as well as the relays, turn the key on, and wipers on low or high, and check for power at the wiper motor connector wires yellow with a brown tracer or the white wire. One will have power at a time based on the wiper speed request.
Take care,
Joe
See pics below.
Images (Click to make bigger)
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Tuesday, December 27th, 2022 AT 9:11 PM