I have a 4 door 2004 Altima with a viper alarm 7900 system with auto start and keyless entry. The alarm and auto start both work but the keyless entry does not. When I try to lock/unlock the doors via the remote the alarm system activate/deactivates but the door locks do not move. I have to use the key to open the door. Once inside the factory button on the doors actuates all of the door locks. This tells me that that part of the system is working properly. Anybody know what could be the issue? Thanks.