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


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)
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rkramer is offline   Reply With Quote