Radar Cruise Control Unavailable

7032 Views 11 Replies 8 Participants Last post by FKHeath, 13 d ago

kallsop

New Rav4 Hybrid LE, 536 miles. Was on cruise today and it disabled itself with the dash message below. It was light raining, wipers on intermittent. It did not clear, and the left/right buttons were ignored, could not change the display. I think it was toggling between this screen and another error screen, and I thought I had taken a picture of the other screen, but I got two pictures of the same screen. The other screen may have been lane departure alert malfunction? Parked it, came back 8 hours later, error has cleared. Drove through a heavy rainstorm on the drive, cruise worked fine. Hmmm. I hate problems that come and go. Any ideas?

EDIT - I have a XTOOL D7 scanner, will hook it up and see if there are stored errors.

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JFox562

· #2 · 12 mo ago

From what I understand, the radar cruise control uses the radar sensor under the front Toyota emblem and the camera high up on the windshield. Both of these need to be clear of debris for the system to able to "see".

There is a lot in this video but it does cover how this system works and what can cause it to display that message.

Also, this is not a hybrid only system so other forum RAV4 Gen 5 threads describe this issue and message.

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FKHeath

· #3 · 12 mo ago

kallsop said:
New Rav4 Hybrid LE, 536 miles. Was on cruise today and it disabled itself with the dash message below. It was light raining, wipers on intermittent. It did not clear, and the left/right buttons were ignored, could not change the display. I think it was toggling between this screen and another error screen, and I thought I had taken a picture of the other screen, but I got two pictures of the same screen. The other screen may have been lane departure alert malfunction? Parked it, came back 8 hours later, error has cleared. Drove through a heavy rainstorm on the drive, cruise worked fine. Hmmm. I hate problems that come and go. Any ideas?

EDIT - I have a XTOOL D7 scanner, will hook it up and see if there are stored errors.

View attachment 183819

I got that message once when it was sleeting. Covered the front radar sensor with slush. I just stopped, wiped off the slush and the problem went away.

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juniorkirk

· #4 · 12 mo ago

I had the same thing happen as FKHeath. You can stop and clean it off, but if you are on the interstate going 70mph and 10 at night, probably not the best idea to stop. You can still use normal cruise control by pressing and hold the "cruise on" button for a few seconds. You will see the cruise icon turn on, but the vehicle silhouette wont be there.

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JFox562

· #5 · 12 mo ago

juniorkirk said:
I had the same thing happen as FKHeath. You can stop and clean it off, but if you are on the interstate going 70mph and 10 at night, probably not the best idea to stop. You can still use normal cruise control by pressing and hold the "cruise on" button for a few seconds. You will see the cruise icon turn on, but the vehicle silhouette wont be there.

The pressing and holding of the cruise control button is documented in the op manual. This method allows for you to turn on a conventional non-radar controlled cruise control. Do not expect it to slow you down as you approach another car; it's only maintaining the speed you set (old school style).

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juniorkirk

· #6 · 12 mo ago

JFox562 said:
The pressing and holding of the cruise control button is documented in the op manual. This method allows for you to turn on a conventional non-radar controlled cruise control. Do not expect it to slow you down as you approach another car; it's only maintaining the speed you set (old school style).

I still see "old school style" as "normal" cruise control. ACC is awesome new cruise control in my book. I've had my RAV for 2 1/2 years now, and by far my absolute favorite feature is the ACC.

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kallsop

Discussion Starter · #7 · 12 mo ago

Concensus then is that this is likely not a hardware failure, just something that can happen if the sensor is blocked/confused by something.

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RyanFromReno

· #8 · 12 mo ago

Had the exact same thing happen in some wintry mix sort of snow/slush - none of it was sticking to the highway, but it sure accumulated on the front of the car. Radar Unavailable! After I stopped and cleared it off, everything worked normally. Nothing to worry about

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Steve--O

· #9 · 10 mo ago

kallsop said:
New Rav4 Hybrid LE, 536 miles. Was on cruise today and it disabled itself with the dash message below. It was light raining, wipers on intermittent. It did not clear, and the left/right buttons were ignored, could not change the display. I think it was toggling between this screen and another error screen, and I thought I had taken a picture of the other screen, but I got two pictures of the same screen. The other screen may have been lane departure alert malfunction? Parked it, came back 8 hours later, error has cleared. Drove through a heavy rainstorm on the drive, cruise worked fine. Hmmm. I hate problems that come and go. Any ideas?

EDIT - I have a XTOOL D7 scanner, will hook it up and see if there are stored errors.
Adaptive cruise control, which uses a radar/radio signal, doesn't work too well in rain/snow/sleet as the water droplets disperse the radar wave making return signals unreliable.

View attachment 183819

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RobertB

· #10 · 10 mo ago (Edited)

Happened to wife's XLE H once last winter. Had freezing rain previous night and suspect sensor was glazed over. Similar thing happened to a Honda Ridgeline I was driving. A vehicle splashed me while traveling in opposite direction and kicked off cruise control. Would not reset until stopped and restarted vehicle. A bit unnerving first time it happens as dash lights up and car looses power.

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susan.moore.lee

· #11 · 14 d ago

JFox562 said:
From what I understand, the radar cruise control uses the radar sensor under the front Toyota emblem and the camera high up on the windshield. Both of these need to be clear of debris for the system to able to "see". There is a lot in this video but it does cover how this system works and what can cause it to display that message. Also, this is not a hybrid only system so other forum RAV4 Gen 5 threads describe this issue and message.

I have had my Rav4 hybrid almost 2 years. Today I got that message for the first time. After I stopped and restarted the car when I had reached my first destination it was working again. The car was clean so nothing was blocked.

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FKHeath

· #12 · 13 d ago

FKHeath said:
I got that message once when it was sleeting. Covered the front radar sensor with slush. I just stopped, wiped off the slush and the problem went away.

Ditto.

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