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Just happened to me: driver side is unresponsive, but passenger door locks/unlocks, trunk works, lights/horn flash correctly. Locking driver door manually also correctly triggers passenger lock. Replaced driver lock assembly, lock actuator assembly, and wireless receiver -- no luck, exact same behavior. Checked fuses everywhere, all good. Troubleshooting steps in the manual seem to point to a fault in the wire harness, but it looks near-pristine and is well-protected throughout its route, so I'm leery about replacing it too (part's discontinued anyway, not sure I could even do it). Finally gave up, just locking car manually now.
James187 - Does the passenger door unlock on the second press? Or neither work no matter how many times you press the button?
Twohoos - Can you check the pin on the keyless unit to see if it is supplying power? Place positive probe in Pin 7 (Yellow/Green wire) and negative probe in Pin 6 (Pink/Black).
It should be 12V when Unlock is pressed on the Key Fob, and -12V when Lock is pressed.