Our FCOM for the -400 says ineffective in both sys description and supplementary procedures... But it doesn't say it doesn't have it!!
(Reason I ask - I've had new to the company F/O's on both A320 and 737 who have stated that there is no point as it doesn't work when I've gone to put it on during the approach. Then been amazed when the ice disappears...Where does this come from??)