why wont my doors unlock and trunk unlockw/remote could it be a modulator on 2008 Mercury Grand Marquis

the door keypad same way wont work,have to use key also on the turnk to open. checked fuses underhood and inside some were replaced but still having same problem

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2 answers
if key pad doesn't work either, probably security module fault. take to dealer to diag
CK BATTERY IN KEY FOB TO START WITH