I think the indicator LED does light up when there are codes to read If you dont jumper it into diagnostic mode too and just have the LED in there.
As a check you can unplug a sensor or two, coolant temp at the back of the engine or O2 sensor while running and see if it lights up.
Cheers
Stot
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1.6 Mazda B6 : Garrett TBO339 : 420cc WRX Injectors : FMIC : Microsquirt V3 : LC-2 Wideband : Toyota COP
Build Started Jan 2013 : OTR Aug 2014 : Build Pictures
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