Power door locks dont work

i went out today and found out something interesting.  If i push the unlock button on the door and hold it for 4 or 5 seconds then release it and it will unlock, when i do the same thing with the lock button i get nothing.  It is acting like it is a voltage issue but why would the lock button have no effect oneither door?

Don't know, test the wires and find out...Mike M2

Tech Manager

CS Dealer Services

Mike's right. You've gotta do that test so that there's something to start with. You might have a bad switch, or you might have some other problem. Knowing what you find on this simple test will help someone on this site to point you in the right direction. Otherwise you and everybody who reads your posts is just taking a shot in the dark.

I checked the voltage and all was fine, the wires for the lock and unlock are a negative system so that the wires have 12 volts going thru them then when you push lock or unlock they are grounded thus sending the power to the motor.  The wire for the unlock wasnt showing any power so i tested it by giving it 12 volts then pressing the unlock button, it worked but then the fuse blew.  I then unhooked my temporary power supply, replaced the fuse and reconnected the relay.  Now the unlock and lock work but both relays are clicking nonstop.  It is quiter when it is unlocked but once the doors are locked it is clicking vey loud.  So i fixed one problem but now i have another.  The relays wont stop clicking!

The wire i applied 12 volts to was one of the 2 wires that go from the switch to the relays.  Those 2 wires are supposed to show 12 volts until the button is pressed.  The motor legs are showing good voltage.  The lock module is not damaged because now it will unlock and lock both doors, after i put the 12 volts to that wire and replaced the blown fuse it will unlock and lock now.  The only problem i have though is now both of the relays are making a loud clicking sound all of the time.  When i press either the lock or unlock button and hold it down the sound goes away until i let go.  When i unhook the wire that is for the unlock the sound goes away and the door will lock like brand new.  My question now is,  is there a way to bypass the factory wiring and go straight from the switch to the factory relays and back to the actuators on both doors to solve this problem and if so how do i do it?