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BCM stores long/short term errors. If it's cleared the short term one you are probably ok. You can't clear long term without very expensive diagnostic anyway. What I'd do is - with a charged battery is lock in normal way pull NEG cable for 20 min. Replace 30a fuse. Lock and unlock 3 times with FOB blipper. What happens with alarm ? Option 1 - It's a PCi BUS no different to any computer. When the battery (computer) goes on again you will hear a series of clicks as it tests various differen relays etc. You 'should' then lock/unlock doors and start vehicle as usual as bignev suggests. Does it ? Option 2 - It works already if it ain't broke don't fix it, leave it, suck it and see. Best of luck. Let the group know.