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Old 06-13-2008, 09:32 AM   #11
rkramer
Scooby Guru
 
Member#: 118209
Join Date: Jun 2006
Chapter/Region: MWSOC
Location: North Dakota
Vehicle:
2015 WRX Limitec

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You DO need one of those modulator boxes... it has nothing to do with the ECU, it is to convert the lighting scheme used by most imports into something that a 4 wire trailer will handle. (blinking the brake light as a signal) You can build one with a couple diodes, or just buy one of the sealed ones fairly cheap. (I installed the walmart one that is around $10 IIRC a month ago, works well, but you need to use an extension with it, I wouldn't recommend putting the converter box outside the vehicle)

http://www.ontheball.com/taillight_convert.htm
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