[WolfeJeepTJ]

Did a search here for the code with no results. Google search says "P0572 Cruise Control Brake/Switch Circuit A Low." Most Google search results say to just replace the brake light switch but I'm a fool who likes to diagnose. So, I referred to the Mitchell wiring diagram and can find no reference to "Circuit A" for the brake light switch. The Mitchell diagram does number the pins Does anyone know which is circuit A?

 

[RUBI 4 MY MRS]

I don’t know for sure about “circuit A” but since the code refers to the brake switch that would be a place to start. There are 2 circuits going through that switch. One opens the ground path to one of the PCM outputs (brake sense) & the other opens the circuit controlling the servo.

You don’t give your yr so I can’t tell you which wires are which.

If you want to diagnose electrical circuits (a very good thing) you should consider getting a year specific FSM (Factory Service Manual) for your year. The Mitchell Manuals for the wiring diagrams are OK but I think the way the factory ones are set up makes them easier to read & follow.

 

[CharlesS]

You don’t give your yr so I can’t tell you which wires are which.

If you want to diagnose electrical circuits (a very good thing) you should consider getting a year specific FSM (Factory Service Manual) for your year. The Mitchell Manuals for the wiring diagrams are OK but I think the way the factory ones are set up makes them easier to read & follow.

According to his profile.... he owns a 2005.