Dear customer what is happening in your vehicle is that when replacing the batteries, the system configuration between the control and the vehicle is deprogrammed, we have to re-program the system, unfortunately for your vehicle does not exist a manual way, likewise i'll give you the procedure to do a manual reset.
1) Turn the key to ON position without ignite the engine.
2) Disconnect the negative terminal of the battery.
3) Wait around 3 to 5 minutes to let all the modules delete its data.
4) Turn off the key and take it off.
5) Reconnect the negative terminal.
6) Turn again the key to ON position and wait around 30 seconds to let the modules restart.
7) Turn ON the car
As I observed that the vehicle does not even start, the reset may not work, this means that the key system is completely deprogrammed, If after doing the programming mentioned above the problem continues, we will have to use a special equipment such as a key programmer. This equipment is owned by car locksmiths companies that work with duplication of keys, programming controls, programming of ignitions. They go to the place where it is the car and with the special key programmer equipment make the programming of the immobilizer system again with the key, practically what is happening is an activation of the anti-theft immobilizer system that is inhibiting the ignition.
Dear customer do not worry this is actually something normal to happen with the passing of time. Always we have to take certain precautions, when replacing the control battery and the battery of the vehicle so that this does not happen although sometimes, it is inevitable.
The repair costs are not very high,I don't know very well the price of a programming today given that I'm out there, but they are usually jobs that don't cost a lot of pounds.