I can explain how to fix it , its up to you to do it.
find the lights on buzzer unit. find the ign input to it , chuck a 5 pin relay inline with it in this fashion:
30 - unit
87a - car ign input
86 - gnd
85 - 2nd timer output.
with the timer going it powers the relay and removes the ign feed off the lights on buzzer letting it work.
should make sense once you do it.