Have a 2004 Chevy Venture van with faulty power door locks. They will lock with the switch but will not unlock with the switch. Need schematics of the power door lock system. Thanks.

I would try a replacement used lock/unlock switch panel before anything else,it would cost almost nothing used and usually fixes this problem,and the switch panel pops out easily for replacement Next possibility would be a broken wire where the wires flex at the door hinge area.Grab one wire at a time and pull firmly until you find a broken one. Make sure the replacement switch panel is a known working one.

If the remote key fob locks and unlocks the doors then the problem is more than likely the power lock switches, this is a common problem on the Venture Van.

lock and unlock use different relays

It sounds like you've got a broken wire on the drivers side door. Usually this occurs at the flex point of the wiring harness. Peel back the outer covering carefully exposing the wires inside. Repair any broken or those about to break. Solder & retape or shrink rap with heat gun.Hope this helps. Good luck!

check the system fuse and or circuit breaker. check the switch wires for damage and loose connections. check the switches for continuity. remove the door panel(s) and check the actuator wiring connections to see if they're loose or damaged. inspect the actuator rods if equipped to make sure they arn't bent or damaged or loose connections. the actuator can ce momentarily. a discernible click indicates that the solenoid is operating properly.

It sounds as though one of the proximity sensors is faulty. Also try giving the tracks for the door a good shot of white spray lithium grease. The door may be binding enough so that the emergency reverse is kicking in.

open the door and look on the side of door for little switch up and down ,it a safety switch ,little gray lever sticking out on the side of doors, move it up or down ,read decal on the door jam,hope to help robert b.

there is a group of wires under the passenger side carpet you will find 2 wires 1 blue and 1 white the make a splice there the splice will be broken just reconnect the wires and you should be good to go

sounds like a faulty lock/unlock switch, Does the other front door lock switch work properly ?

passager side lock and unlock the door try it out pierre