mack24

I was on a freeway yesterday in heavy rain and the cars and trucks were throwing up sheets of water when they hit puddles. Several times they hit windshield/grill area as I drove through them which made it very difficult to see. Three of those splashes caused the cruise control to immediately stop working including lane centering. I depend on lane centering to help me stay centered until the windshield starts to clear. The first time it happened it took me several seconds to realize the lane keeping was out. Luckily the system turned right back on when I pressed the button and the centering began immediately. I have never had this happen before so it was totally unexpected. I called my service writer and he said he had never heard of this happening on any Lexus. I would appreciate any feedback. I can’t believe I am the only one with this problem.

thanks for your help

Bruce

Klamalama

Fo as long as I've been driving, no car manufacturer advises the use of cruise control in the rain. See page 306 of your Owners Manual.

KennyFSU

The constant speed can increase the chance that your tires will hydroplane and you could lose control of your vehicle. Only use your cruise control when the roadways are dry and clean, and never during rainy or icy conditions.

jahnjva

Those splashes basically blinded the system. Thankfully the system shut down. Would you want a blind machine guessing where to steer you?

Urlik

The system was working correctly for how it is designed to work and the conditions you were experiencing.

chipotleking

After testing cruise control for a couple weeks, I found that it's more trouble than it's worth for my 30 minute highway commute to and from work. I found myself being super attentive and paranoid because I don't want the car to drift to another lane. Also, the cruise control doesn't take into account the position of cars in your left and right lanes. So there's a chance you could be driving in someone's blind spot for an extended period of time. I think cruise control would be useful if I were driving from norcal to socal, a trip that takes 6 hours with only 2 lanes on I5. But for my daily commute I don't think the benefits outweigh the negatives.

Urlik

To each his own. I've used in on the 40 mph feeder road into my housing development. (I have a tendency to drive too fast on that road)

toyotaman7

Cruise control on any car should NOT be used during rain, snow, fog or bad weather. The manual explicitly says that.

The system uses radar and a camera to see what is in front of it. Rain/snow will hinder that. Additionally, the system will apply accelerator and brake to the wheels with the assumption that they have full traction. If roads are slippery or hydroplaning, the system will cause the car to get out of control and could cause an accident.

I use the radar cruise control on my daily commute of 100 miles per day in dry conditions and love it. Its even better in traffic. The new Hands free Cruise that works under 25 MPH (40km/h) is good as well, just annoying that it cuts off at 40 km/h. That part is for sure half baked. Hopefully they send an update that increases that speed to 80 KM/h (50 MPH).....

Elvisfan

If you are paying attention, you would know enough to speed up or slow down to move away from cars next to you. The only negative I know is the occasional time you find yourself going slower because the car in front is slower.

Urlik

Fortunately we get a choice between set speed cruise and adaptive cruise. If other vehicles slowing you down bothers you, you can use speed set cruise instead.

chipotleking

Yes speeding up is easy, but slowing down requires you to brake. When you brake, it exits the cruise control, so you would have to restart cruise control. All of this is a hassle in my opinion.

Elvisfan

Actually, you do not have to brake to slow down. Just decrease the set speed. When you have cleared the car next to you, increase the speed again. Even if you brake, it is usually not that hard to hit RESUME. I don’t know about the RX, I don’t have one. But I have never found hitting resume a hassle. I can do all that without having to actually move my foot.

madmax24

Three times in the past month, I have received a message on the dash that says something similar to, "System Shutdown. Consult Owner's Manual." Does anyone know what this means? I couldn't find anything in the Owner's Manual.

All three times this warning appeared, I was using cruise control, distance following, auto lane keeper, auto headlights, HUD and wipers. The only thing I know for sure that shut down was cruise control. Other stuff may have shut off but, I didn't notice.

Has anyone else experienced this?

2023 RX 350
Nori Green w/Luxury Package

Urlik

Weather conditions making the radar following unusable maybe?

Carbuff2

Agree with the Urlik. Key statement was "using wipers".

You could make this occur less often if you apply wax to the Lexus symbol ("L") in the center of the grille. That way, dirt/rain/snow will tend to slide away and not incapacitate the safety systems.