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Old April 28th, 2019, 10:37
lawsoncl lawsoncl is offline
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Join Date: Jan 2006
Location: North Idaho
Posts: 5,166
Re: AW4 TCC / Brake switch circuit

I believe that's correct for the older AW4 setup, but might have changed in 98? What year tcu are you using? There was a pullup resistor wrapped up in the harness near the TCU that would pull the voltage up to 12-volts if the ground connection at the pedal was broken by pressing the brake. It's backwards from what you'd expect if they just hooked the sense wire to the brake light circuit.. When I did my manual to aw4 swap, I didn't track down the switch and just used a small relay driven by the existing brake light switch.
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