Keyless entry question
 

Hi, I have a problem with the keyless entry on my 2005 mazda3. It’s my wife’s car, and since she bought it, the keyless entry won’t work. The place where she bought it they told her that it had an aftermarket alarm installed and that’s why the rectory alarm-keyless entry didn’t work. So, I’m trying to figure out how the hell to fix this problem. It’s a PITA, opening the doors with they key and carrying the baby at the same time. Please, I greatly appreciate if anyone could direct me on where to check or if anyone have diagram of the keyless entry system so I can pin point the problem. Thank you guys in advance!!!!