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Thanks for the reply, LILEVO. I think I may have been unclear in my initial post: I’m actually looking at two separate issues.
Primary Issue: The Option, Audio, and Climate buttons are not functioning see photo below for reference. (ANY HELP WITH THIS ISSUE WILL BE VERY APPRECIATED). Buttons don't make a sound, and the screen doesn't change when pressed.
Secondary Issue: The horn is also out.
I mentioned the horn just in case the two are linked, but for now, the dash buttons are my main priority. I haven't checked if the steering wheel controls are affected yet, but I'll test those next.
+1 on clockspring
Use the genuine Toyota part, don’t waste your time with a $25 or $30 eBay counterfeit.
This is helpful since the smart key is also acting up. I have to use the key to start the car. The Lexus dealer doesn't want to check the harnesss since the iPod adapter is aftermarket, even though it is unplugged. Would the gateway ECU have anything to do with needing to replace the Nav Unit itself? I don't know much about the electronics on this car and I have concerns about the knowledge level of the Lexus Service technician in Cincinnati.
Thanks,
Dale
Hello drw6895,
I'm having the same issue in my 2004. Did you ever find a solution for the three buttons not working?
No i haven't but it really isn't that hard to take it out. I was surprised how easy it was when I put in an android system.
I dont want to hijack this thread but if you have posted on the video unit replacement, please point me to it. My unit is de-laminating and the screen looks terrible.
After sourcing a donor car and swapping nearly every component in the climate/audio system—screen, head unit, trunk amp, GPS module, and a couple of other modules—with zero improvement, I finally tracked it down.
Everything pointed to a communication issue. While driving, I held the climate button and pressed the steering wheel volume buttons at the same time—and boom, the climate screen popped up. I repeated the same trick with the audio and options buttons, and those screens came back too.
Once I got into the Options screen, I accessed the diagnostics menu and ran Display Check and Panel Switch Check. Every button press was registering as “MULTIPLE”, but if I held a button and tapped the steering wheel volume, the correct input would briefly appear.
At that point, combined with the fact that my horn wasn’t working, it clearly pointed to the clock spring.
Replaced the clock spring—and everything works perfectly now.
Screen confirming communication jam Donor Car
Last edited by Lvall029; Apr 27, 2026 at 01:07 PM.
