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Re: Brake switch for Gen IV LMG 5.3
You can kind of disregard what I said in post 9, my dumb ass was looking at BCM connectors, so sorry about that. I checked it again, and it definitely shows the ECM needing power at X1 pin 9 when the brakes are applied. Not sure why your HPTuners is showing the brake on/off signal backwards though. Have you tried actually hooking up the brake lights to see if that changes anything? Also, what pins do you have the other wires on the brake switch hooked up to?
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