WTK: Car Alarm not locking doors

[redman2k8]

I have those prestige car alarms...

All of a sudden when arm the vehicle, I hear the "single chirp sound" BUT my doors (central locking) would not lock. I have to lock the doors with the key after. The exact opposite when I want to disarm. I hear the double chirp sound, but the car is still locked i have to unlocked the doors with the key

Any solutions?

[mickel15]

the actuator in the door must be need to be replace

[skylinechild]

check the alarm relay..and grounding points for the alarm. also the wire harness from the alarm to the central locking circuit.