yesterday my panssenger power lock quits. the driver doors works but the passenger door emits a buzzing sound each time I press th elocks button. How I can repair this. I can still open the door from the inside with the door handle and from the outside I can unlock the door with the key

 

sounds liek the unlock motor needs changed, or theres a loose wire somewhere but I doubt it

 

Door lock actuator.

 

Possibly a bad ground ? You might want to clean/lube the actuator to extend it's life. Sooner or later the power stuff wears out.
Just my $.02