this is not on my vibe but its on my moms 2000 Mazda MPV. she has the keyless entry thing and secruty system on it and when she locks the car the lights do not flash like they are supposed to. is it a fuse or a loose conection?
Or a door not fully latched. Maybe even a window not rolled up all the way. The vibe won't blink if you lock it and a door or the hatch isn't shut all the way.
GMJAP would know a little more, cuz he made the horn beeper for the vibe when you lock/unlock. to me it soulds like maybe a connection is loose or fuseblown in the relay that tells the lights to blink when the doors are locked/unlocked. The vibes relay was behind that little flip down compartment on the driver side where your left knee would be.