Re: grand cherokee alarm system change
The key fob is a well known thing to fail or at least it is well known to not function well at long distances. The receiver is mounted on the passengers door module. Try to unlock it standing close to the passengers door, if it works well, then the key fob is not the problem, but it can be that the antenna wire broke off.
Some people tried longer wires, but i have never heard of the results of this.