Display buttons in Steering wheel not working after Jump.

You find the most details online in the electrical wiring diagram:

Toyota Service Information and Where To Find It | PriusChat

Does your car have the Touch Tracer display (you see a glowing outline of the steering wheel buttons over the speedometer when you touch the buttons)?

The steering wheel is wired two different ways depending on whether you have that feature or not. Without the feature, you have the wires marked (*7) here ("w/o Touch Sensor"). The TRIP and DISP buttons just have their own two wires through the spiral cable and back to the combination meter.

With the touch tracer feature, you have the wires marked (*6) here ("w/ Touch Sensor"). They use the same two wires through the spiral cable, but instead of just carrying one button each, they use one to supply power to a little micro computer in the steering pad switch, and the other wire carries messages from the computer about all the buttons being pressed, back to a STRG terminal on the combination meter, where the messages get decoded.



In that version, the power to that micro computer comes through the 10 amp IGN fuse. But so do lots of other things; I expect if that fuse were blown you would notice other things not working. Have you noticed if the cruise control is working? Or the passenger airbag on/off light?

 

For me the horn and display/trip buttons aren't working, but I don't get any airbag light and the cruise control works great. What could it possibly be?

 

Sometimes a problem like that will be the spiral cable, but that's not the only possibility.

By the way, what's your answer to the question in that post you quoted? Is your car with the Touch Tracer feature, or without?

 

It is with the Touch Tracer feature.

 

Ok, so that means in the drawing in post #2, it has the wiring variants with the (*6) marks, namely the red one bringing IG power, and the green one from TX1 in the steering wheel to STRG at the combination meter, and button presses are sent as coded messages on that TX1-STRG link (instead of over separate wires as they would be for the non-Touch Tracer cars).

I'm not sure if knowing that will help you or not, but sometimes it does, depending on what kind of problem is involved.

 

I have no idea what you said.

 

If you have a multimeter and the ability to read and follow a diagram, refer to posts #2 and #6 and track down the cause of the problem.