Alarm beeping.

[andyroo104]

When I purchased my car upon checking the alarm function there was no sound/siren when alarm was activated,found the alarm siren to be missing so I purchased a used siren box,now upon fitting when I arm the system I get a beeping from the alarm siren that stops after about 12 beeps.This happens when I arm and disarm the system,also when I trigger the system there is still no sound but indicators flash.
Does the siren battery need to be charged by being left fitted for a while ?
Would the replacement siren be compatible with my alarm/ecu or would it need to be paired somehow?
I have searched these problems but not really found the answer,any help please.
Thanks in advance.
Andy.

[SteveJ]

It thinks either the doors, the engine lid or the frunk lid are open. Most likely the switches are missing or not connected for the engine lid / frunk.

[andyroo104]

But surely the alarm siren should sound when the indicators flash once I trigger the alarm.
Andy.

[SteveJ]

Not if it never arms itself because the sensors (and I include switches in that definition) aren't working!

It's beeping you to warn you of this status.

[andyroo104]

Ok thanks I will check all the sensors/switches tomorrow.
Andy.

[Wabbitkilla]

Mine doesn't beep when arming and disarming, it only beeps if a door, engine lid, or frunk lid are open.

[Anonymous]

Mine doesn't beep when arming and disarming, it only beeps if a door, engine lid, or frunk lid are open.

+1