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There are several things that can cause these to fail in addition to a fuse. You need specialist knowledge to trace out the circuit and identify if it is the switches, power supply, wiring or control circuits. I suggest you take it to your local repairer or an auto electrician. I presume you have checked that the lock out switch is not on.
You need to understand how they work , do you know about automotive electronic controls ? Your switches are just inputs to the BCM - body control module !
Door Locks Power and Ground
For door lock operation, the IP Fuse Block supplies battery positive voltage, through the 15 amp DR LK/TRUNK fuse, to the BCM. The BCM uses this circuit exclusively to apply power to the door lock actuators. The BCM is also supplied a ground circuit, which it uses exclusively to ground the door lock actuators. When a door lock is pulsed, the BCM internally connects these two circuits to the appropriate lock and unlock control circuits to actuate the locking or unlocking functions.
When diagnosing door lock malfunctions, these circuits must not be confused with the other battery voltage and ground circuits of the BCM. The appropriate wiring schematic must be used to locate the correct circuits. Failure to identify the correct battery voltage and ground circuits of the BCM during diagnosis of door lock concerns may result in misdiagnosis and unneccessary parts replacement.
Passenger Door Unlock Operation
When the BCM detects a transition of either of the door lock switches to the Unlock position, it switches the door lock actuator unlock control circuits to voltage. Since the door lock actuator lock control circuit is at ground potential within the BCM, the passenger door lock actuators transition to the Unlock position.
The door lock actuator unlock control circuits are dedicated control circuits used only for the passenger door lock actuators. This is done so that the driver door may be unlocked individually before unlocking the passenger doors using a keyless entry transmitter or an automatic door unlock function, if programmed. When the keyless entry transmitter is used to unlock the passenger doors, the BCM requires a repeated unlock command before it performs the unlock function. However, when the unlock input is from a door lock switch, a single unlock command is all that is required to unlock all doors.
It is a common problem across many models of cars. The usual cause is failure of one or more lock actuators but this is unusual in a 2013 model vehicle that has probably not had a great deal of use. It is also unusual for 2 actuators to fault at the same time. In any event the interior door panels will need to be removed to inspect the actuators and the wiring.
If both door locks failed at exactly the same time I would seriously doubt the actuators are the cause. It is much more likely to be another issue such as a problem with the wiring to the doors on that side of the car. However it is not possible to identify the cause without removing the door panels and checking everything. (I think the dealership is basically honest when they tell you replacing the actuators may not solve the issue because until they check everything on the 2 doors with the problem they just will not know what the cause is.)
Normally there is only one fuse covering the entire central locking system and if the fuse blows you will loose power to all door locks not just 2 of them.
Instead of wasting time searching for the exact location, why not just remove each fuse 1 by 1, and replacing them as you go so you don't mix them up. If you have any blown fuses, you will find it in under 30 seconds. If you don't know the difference between a good vs blown fuse, ill post a picture to help you identify.
The key problem... is the used because it may have had the lock changed on the door. If not the linkage inside the door may have come loose, It is held on with a plastic clip. As for the fuse problem just pull the fuse out and look at it, if there looks to be burnt or and disconnect just replace the fuse
The fuse box is located under the dash, you have to remove the cover and the diagram will tell you which fuse is for each item, there is a little fuse puller once you identify the fuse for the locks just pull it out and check and see if the little wire is broken, if so this is the bad fuse and need replacing.
from my experience power windows and door locks usually have circuit breakers(usually metal)that will reset after they trip where as a fuse will blow and have to be replaced if there is an overload in the circuit.so look for metal circuit breakers in the fusebox which is sometimes under the hood,under the drivers side dash,or even inside the glove box.if u have the owners manual that would be a great help to identify the fuse and fusebox location.