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moisture in a late model car is very very rare
they are not open roofed like a cobra
only way we find moisture in new cars is if they go for a drink in king qeorges river

anyway back to the problem

ive replaced about 5 bcms in late model commodores because the blinkers stick
now u might have similar prob but in reverse

bcms play up often
i have about 5 spare with minor probs and only use them on conversions where blinker circuit is not being used

anyway i can fix yr prob otherwise take it to yr holden dealer

if it is the bcm then u need 2 new remotes and need to get new bcm coded to the engine ecu and the new remotes coded to the bcm

prob bout 300 to 400 bucks all up