boostDR Posted March 25, 2018 Report Share Posted March 25, 2018 Hi. I found the shift light output which I have set on Aux 5 defaults back to low side when the ecu is restarted. I require High side however it won’t save the setting. The driven source is 36 ohms so should be under .5 Amp draw Is this possibly a firmware glitch? My firmware is: 5.6.5.3389 Matt Quote Link to comment Share on other sites More sharing options...
cj Posted March 25, 2018 Report Share Posted March 25, 2018 I found the same bug a few months ago and had to re-wire the shift light to low side drive Quote Link to comment Share on other sites More sharing options...
boostDR Posted March 25, 2018 Author Report Share Posted March 25, 2018 Just found in the help me notes, “only a few auxiliary output functions allow high side driving, ie GP output and CAM switched” I used CAM-Switched and it works fine now. So not a firmware bug ;-) Matt Quote Link to comment Share on other sites More sharing options...
cj Posted March 25, 2018 Report Share Posted March 25, 2018 How did you use cam switched to trigger a shift light? I'm guessing you dont actually use cam switching and were happy with just on/off for the light? For the link guys: If any of the aux outputs 5-8 are set as "shift light PWM" then it lets you select high side drive (as do most other functions on those outputs), and from memory it did actually work until the ecu is power cycled and it changes itself to low side drive. Would be nice if the firmware either worked, or at least didn't let you set high side drive if its not going to work anyway. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 25, 2018 Report Share Posted March 25, 2018 Yes, I just tested it and can confirm it is probably a bug. It should function properly as a high side as far as I know - the help seems to suggest it will. I will get it on the fixit list. Quote Link to comment Share on other sites More sharing options...
dx4picco Posted March 20, 2020 Report Share Posted March 20, 2020 Hi, I'm not sure if my issue is the same or not, wrx4+ pluggin, I wired an LED band to act like a shift light, 120Ohm resistance, on the aux6. Wired as high side driven, ECU to LED to GND. I always get the led turned ON when I select the paramter Shift light (PWM). I tried to go in test mode ON, if I select lowside and chenge the polarity, the LED turns on and off accordingly. Now if I select highside, LED is always ON whatever the selected polarity. I that a firmware bug, or didn't I catch a specificity of this shift light function? Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 20, 2020 Report Share Posted March 20, 2020 There is no highside drive hardware on most of the plug-in ECU's (a couple of exceptions on specific models only). It will work in test mode as there is a weak pull-up resistor to 12V, so when "off" it will output 12V. I think you will have to re-wire your lamp so that it is connected to 12V and the ecu controls the ground side. Quote Link to comment Share on other sites More sharing options...
dx4picco Posted May 25, 2020 Report Share Posted May 25, 2020 I finally tested it this last week, works wonders. Quote Link to comment Share on other sites More sharing options...
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