I fix them by replacing the relays. There are two in each module, one for unlock and one for lock. You can buy the relays from most electronic suppliers on line for about $1.50 each. I got mine from Arrow electronics in Nevada Cheap! P/N JSM1-12V-5. Once the door panel is off the module just unplugs and pull out the board. Unsolder the relays and solder in the new ones. Takes a little time but better than $400+++ each for new modules.