Hi. Sounds like when you pushed the radio back in you may have caught something and dis-lodged it? I have fitted many a radio in to My YRV Dash and know with these aftermarket radios the amount of extra wires you can get with them. And how tight it starts to get when you put the radio back into the dash. All I can say is it sounds like you may have dis-lodged another wire perhaps when you pushed your new radio in. Have come across many a botched job before now where the last owner has spliced a cable somewhere for example and you may have over stretched it for example.
Your best bet is to take the radio out of the dash and try again. Ideally you are supposed to disconnect the battery first before attaching anything electrical into the car so you never know you could have also shorted something somewhere Also check all your fuses in both the engine bay and the cabin area to see if you haven't blown one when doing the installation. Good Luck

Edited:

Just read you have an alarm fitted? Just to make you aware Daihatsu never fitted alarms to any of their vehicles, only immobilisers, so it could be the third party alarm and how this was fitted that could also be the problem.