I did just repair my door lock on the passenger side the dorr lock module was like a brand new mechanicaly. The problem was the electrical connector that was corroded. The damn connector is installed upside down so the water could infitrated it very easyly. I had to jump a wire, the pin was totally out of order. If the four door are in the same condition, it will be a mess, It took me about 3 hours to fix 1 door. Probably your dont need to replace the complete module, just fix it. To repaire the module it self took me 15 min.