OK if the switches do the same the trouble is in the wiring that is around those relays. You swapped one relay correct? Swap the other one as well. They work as a team. When you trigger lock/unlock. One relay acts as a ground path while the other relay provides power.
If the ground path in the "unlock" relay is bad the door locks won't lock. If the relay swap doesn't work there are easy tests to find the problem.
To test the system you will need two tools, a test light and a short jumper wire. The tests can be done right at those relays. Should take about 20 minutes to do.
Saturday, January 7th, 2017 AT 3:37 PM