98 chev blazer doors lock on their own

heres the deal im riding down the road in my 98 chev. blazer and for no apparent reason door locks engage,when this is happens i can hear an electrical buzzin coming from the dash near the fuse box. i checked fuses in
passenger compartment as well as under hood both fuses were good. advace auto told me it was a circuit breaker, bought that, got home looked in haynes repair manual it mentions circuit breakers but does not identify location of them, could you tell me where to find them or if it might be something else causing this, my remote for doors doesnt work when this is happenenin.then all of sudden for no reason the doors will lock and unlock with remote. i had my catalytic converter replaced earlier in week and am wondering if sensor beside cat may have gotten damaged didnt have this problem prior to cat replacement. please help before im locked out. thanx!!
about to freak out angelea

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