2007 RT Magnum, power door locks, will unlock, but will not lock??????

Doesn't have any relay's for the door locks . The (GEM) generic electronic module controls the door locks . Your best bet , take it to a qualified repair shop.

The Door Lock Function When a door lock control switch is moved into the lock position or a door lock cylinder is rotated to the lock position, a ground is provided to the lock circuit input to the generic electronic module (GEM). The GEM then provides 12 volts to one side of the door lock actuators contained in the door latch assembly and simultaneously grounds the other side of the door lock actuators. This completes the door lock actuator circuit, causing the door lock actuators to rotate a cam assembly, which then locks the doors.
The Door Unlock Function When a door lock control switch is moved into the unlock position, the door lock switch grounds the unlock circuit input to the GEM. The GEM then provides 12 volts to the opposite side (relative to locking the door) of the door lock actuator(s) contained in the door latch assembly and simultaneously grounds the other side of the door lock actuator(s). This completes the door lock actuator circuit, causing the door lock actuator(s) to rotate a cam assembly in the opposite direction, which then unlocks the door(s).

Generic Electronic Module (GEM) Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1300 Power Door Lock Circuit Failure GEM Go To Pinpoint Test D . B1309 Power Door Lock Circuit Short to Ground GEM Go To Pinpoint Test D . B1310 Power Door Unlock Circuit Failure GEM Go To Pinpoint Test D . B1341 Power Door Unlock Circuit Short to Ground GEM Go To Pinpoint Test D .
Have a qualified technican diagnose the problem .

1. broken / loose wire
2. power door latch broke/defective. ( operating solenoid in latch is bad).

Power door lock's are controlled by the BCM - body control module . Are you familiar with automotive electronic's ?
Door Lock System Components
The power door lock system consists of the following components:
• Driver door lock switch--Uses a single signal wire for both lock and unlock switch activations
• Front passenger door lock switch--Uses a single signal wire for both lock and unlock switch activations
• Body control module (BCM)--Class 2 module which requires programming when replaced
• Reversible door lock actuators in each of the doors
• Body control module PWR 15A fuse--Located in the body control module fuse panel, supplies power for the door lock system

Door Lock and Unlock Operation
The BCM PWR fuse supplies battery positive voltage to the BCM for the door lock system.
The BCM supplies and monitors a reference voltage to the door lock switch through the door lock switch lock/unlock signal circuit. The door lock switch also receives a constant ground source. If a door lock switch is placed in the lock position, the reference voltage is taken directly to ground and the BCM senses 0.0 volts on the signal circuit. If a door lock switch is placed in the unlock position, the reference voltage is taken to ground through a 1.5K ohm resistor that is internal to the door lock switches and senses approximately 2.9 volts on the signal circuit. This is how the BCM determines what portion of the door lock switch was activated.
The BCM, upon receipt of a door lock switch lock or unlock signal, will switch the appropriate door lock actuator control circuits to battery positive voltage. The opposing side of the door lock actuators are connected to ground internally within the BCM through the other door lock actuator control circuit and the doors will lock or unlock appropriately.
Vehicles without keyless entry have two internal drivers in the BCM to control the door lock actuators. All door lock and all door unlock. Vehicles equipped with keyless entry have three internal drivers in the BCM. Driver door unlock, passenger door unlock and all door lock. This is done to isolate the driver door lock actuator so it can be unlocked by itself using the keyless entry transmitter.

Have you tried locking and unlocking the door with the key, most likely the security system has locked you out.

key is worn,lock is worn,put graphite in lock

If the door locks properly, it is not the actuator. It's only function is to lock or unlock the door. Something is sending a signal for it to unlock. Just like if you try to lock it with the keys in the ignition, it automatically unlocks. Maybe read through the locking options in the owner's manual.

The most likely cause for the door locks locking and unlocking while driving is one of the door lock actuators has gone bad. Usually the one causing the problem will jump up and down real fast or commonly called 'machine gunning' and then the rest of the locks will unlock,lock,unlock. If this is the case then the door lock assembly or actuator will need to be replaced.

Alarm is programable. May have to take to dealer or possible after market shop. When battery power was lost it lost memory.

Pull the switch panel and verify you have power to the panel first.

sounds like your bcm is internally malfunctioning