Both controllers don't seem to vibrate anymore

They was both working fine, lil red light for the analog bit lit up an all.... Then the only thing I done is delete a few old game data bits from the mem card (GT3, WRC and some other game I can't remember)

Noticed it ain't working (vibration) on either controller now, regardless of what game is in, red light still comes on both of em, analog till works, just no vibration.... Noticed while playing GT3 so went to options (in game) and had a looked and the vibration option was set to ON for both yet still no work. Can't seem to find any other setting or options in the PS2 set up/settings bit.....

Any idea's? Pissing me off