I know that the flashers will go off while programming the keyless entry or alarm "brain" on the central locking module. If ou have already replaced the flahser relay, check your connection behind the GB. Start by checking the relay though.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>