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Old 11-13-2012, 07:05 PM   #286
Registered User
Join Date: Jul 2009
Location: Columbus, Ohio
Posts: 1,025
My Ride: e46- 1999 323i
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.

Photo in Cleveland, Ohio
1999 323i - Totaled at 265,000 miles.
Now an e30 & e90 owner.
thefrog1394 is offline   Reply With Quote