E46Fanatics - View Single Post - $5 Alternative for Lock beep
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Old 11-16-2012, 04:22 PM   #291
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Join Date: Oct 2012
Location: Houston
Posts: 74
My Ride: Snow pckg e46 325i
Originally Posted by thefrog1394 View Post
OK Guys... THIS NEEDS A RELAY! For one it trips a fault in the GM5 that the siren wire is short circuited. These piezos may not be enough current draw to do permanent damage but connecting a real siren actually makes the windshield wipers go off when the alarm is triggered! The siren wire is a logic wire designed to run a relay in the factory siren, not to sink the current required to drive the alarm. Thats why that brown ground wire is in the harness. I just picked up a $5 SPDT "PC relay" from radio shack to fix this install on my brother's car.
So how exactly do you wire this relay?
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