I use both Speed Limit and current speed on HUD. Only half of the Speed Limit is showing. Dealer is saying that nothing is wrong and that I must be traveling in an area where the reflection of the sign is not happening. I travel the same roads everyday and have always been able to see the recommended speed limit. Appears to be a circle hiding the bottom half

 

That is not the case on my HUD. It shows the speed limit (Road Sign Detection) as well as current speed. Lexus tech needs a test drive…

 

Check the HUD vertical position.

With the car ON and Parked; using the steering wheel left selection arrows

• Go to settings (gear icon / last one)
• Scroll up or down to the option "HUD Brightness / Position" and select (middle OK button)
• Scroll UP or DOWN to adjust vertical position

 

Both the technician and me performed the steps as you described. My issue is not with the position of the HUD read out. No matter the position only half of the Speed Limit is visible. There appears to be an invisible circle covering the numbers

 

Up until 2 weeks ago, my HUD displayed both the road sign and the actual speed.

 

Check the HUD projector area for obstructions (hole area in front dash driver side). Have you changed to Polarized eye-wear recently with bifocals? Polarized lenses can block or obscure display images.

Other than that, as @TechNut suggested, have the dealer test drive and fix it.

 

I believe you are using the lexus nav? The nav we get in the UAE for lexus is very bad. Even google does not show the speed limits, except waze. However waze's navigation is really bad.

 

When I first purchased my used Lexus I immediately shut off the HUD when I test drove it. After purchasing it, I tried it out and noticed the same problem. Took it in to the dealer, and they replaced the unit without issue. Problem resolved!

Your dealer is not listening to you. That perfect circle of missing image is not the image fading against a bright background.

insist they replace the unit.

good luck!