door locks?

recently my door locks wont work and dont know what it is. it sounds like real weak when u lock on unlock it wont even lock when u are driving useally they lock themself.having issues with it cant somebody help me plz???

Year and number of doors?
check for a volt drop across the power and ground circuits while operating the locks. .25V is acceptable, but in new condition they are near 0V. If the door(s) has/have been apart recently, make sure the linkage from the actuator is installed in the groove (if applicable), and otherwise ok.

Also check the ignition voltage, although I would assume you'd notice other things before the locks.

One door or both/all?

yeah its both doors.it happen when my chick hold the lock button down and the same time i unlock the truck and then lock it back when i came back both of them will not unlock or lock when u try to lock it the the relays click like it has current and the door motors sound like they want too. when u unlock it does not do nohting not even a noise??