Only the front left speaker works. No continuity on right front speaker wires. Cannot reprogram remote to work with vehicle. Is there a common wiring nexus to look for?

I found a small speaker from another vehicle and found that it will work at the rf tweeter location, but not at the RF door. What should I do next to diagnose?

Stock stereo. No history on vehicle.

Scan tool reports b2600 and b1480. Both are history/pending.