Its a LIN / CAN bus system so all the computers are talking to each other not necessarily wired in conjunction with each other if that makes sense.
on page (90)-70 and (90)-71 of the wiring diagrams it shows the high beam relay coil wire is sunk to the ETACs ecu which is (in Lefthand drive cars anyway) where your left knee would be when driving which is a known issue area.
The others are leading you in the right direction with the connections.
You can reset the system faults yourself by disconnecting the battery completely both terminals and zip tie the main cable wires on the car together for a few minutes to drain the residual voltage. Although i never did it on the mirage ive doneit on half a dozen of other cars and never had an issue.
https://youtu.be/F6pMlbNW7-E?si=5PAC0-7X64Ul3G-L