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How do I operate the adaptive cruise control in my vehicle?

Adaptive cruise control supplements conventional cruise control with an active vehicle-to-vehicle distance control feature. designed for use on freeways and express ways, in vehicle-to-vehicle distance control mode, your car automatically acceler... sep 24, 2022 • knowledge, new section, only answer.

Adaptive cruise control supplements conventional cruise control with an active vehicle-to-vehicle distance control feature. Designed for use on freeways and express ways, in vehicle-to-vehicle distance control mode, your car automatically accelerates or decelerates in order to maintain a preset following distance from the vehicle traveling directly ahead of you.

To activate the system, press the "ON/OFF" button at the end of the stalk on the lower end of the right side of the steering wheel. The radar-ready indicator will appear in the Multi Information Display.

Accelerate or decelerate to your intended speed, then press the stalk down to set it. If you want to go faster, push the stalk upward and hold until you've reached the desired speed and then release it. Or, if you want to slow down, push the stalk down and hold as you decelerate, then release it once you've reached the desired speed.

To cancel cruise control, tap the brakes, pull the stalk towards you or turn the system off with the ON/OFF button.

Adaptive Cruise Control was designed to maintain the preset distance between your car and the car driving in the same lane directly ahead of you.

When it’s active, it automatically adjusts for changes in the speed of the vehicle traveling directly ahead of you in order to maintain the vehicle-to-vehicle distance you set.

In the event that you would like to change the preset distance between vehicles, you can do so by using the radar range button located on the lower right side of the steering wheel. Simply press the button repeatedly to cycle through the ranges available. You'll find them displayed on the Multi Information Display. And finally, you can disable the distance holding feature by pushing the cruise control stalk away and holding it until the indicator disappears and the conventional cruise control indicator lights up.

Please click here  to view a video.

Disclaimer: Adaptive Cruise Control is designed to assist the driver and is not a substitute for safe and attentive driving practices. See your  Owner's Manual for important instructions and cautions.

Not all features are available on all vehicles and model grades. Please see your Owner's Manual for further details and important safety information.

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Radar Cruise Control Unavailable

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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.  

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.  

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).  

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

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  

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.  

juniorkirk said: You can still use normal cruise control by pressing and hold the "cruise on" button for a few seconds. Click to expand...

dj1 said: Interesting, I tried to use this method, of holding down the cruise button for a few seconds, but it didn't work for some reason? Click to expand...

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Adaptive Cruise Control Failure - Be Careful !!!

By bZ4X, January 1, 2023 in Toyota bZ4X Club

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I made my first long distance journey with bZ4X. As you can see in the video, activated adaptive cruise control (ACC) but car did not detect front car and if I didn't brake, it would crash! This is a very important safety failure, I dont know what is wrong with sensors. I tested this 3-4 times and everytime same problem happend on that rainy journey.

If I compare; I used Volvo XC90, Rav4, Skoda Karoq before with ACC but never had this failure even in very heavy rainy days. Only some days rav4 deactivated ACC and other safety features such as lane assist due to dirty sensors. 

Please see video, I had to brake car last minute and this deactivated ACC. I will report this to Toyota. 

Edit: I set ACC the longest distance, It should follow the front car with minumum 40 m distance @ this speed. 

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bZ4X 27 posts

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Jan 27 2023

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37 minutes ago, bZ4X said: As you can see in the video, activated adaptive cruise control (ACC) but car did not detect front car

It's difficult to tell for certain from the video clip, but it would appear that it did detect the car in front and then 'lost' it (and once you'd touched the brakes the system was deactivated anyway). Either way you need to take this back to the dealer to investigate / address.

The system shouldn't be that different from that fitted to the RAV4 and, while I don't bother with LTA, the ACC works exceedingly well - including in rain and heavy spray where the system can 'see' rather better than I can!

To add ... there is a TSB / recall for the LTA system for the bZ4X (amongst others) - you might want to check whether this applies to your car and whether or not the fix has been applied ...

28 minutes ago, philip42h said: To add ... there is a TSB / recall for the LTA system for the bZ4X (amongst others) - you might want to check whether this applies to your car and whether or not the fix has been applied ...

Yes, my dealer confirmed that they applied fix for that. 

1 hour ago, philip42h said: It's difficult to tell for certain from the video clip, but it would appear that it did detect the car in front and then 'lost' it (and once you'd touched the brakes the system was deactivated anyway). Either way you need to take this back to the dealer to investigate / address. The system shouldn't be that different from that fitted to the RAV4 and, while I don't bother with LTA, the ACC works exceedingly well - including in rain and heavy spray where the system can 'see' rather better than I can!

Actually, I manually turned ACC off and on at the begining of this video. Car didn't detect front car at all! When I was too close I pressed the brake and ACC disabled itself. I tested this with a bigger size car front me and on the middle lane, but I got same problem and sensor didn't detect the front car. Rav4 has safety sense 2.5 but bZ4X has safety sense 3.0, thus I expect much more better and improved detection. 🙄

Just a thought, are you quite sure you enabled ACC rather than CC? 

The behaviour suggests CC which will maintain speed right to the point of emergency braking. 

I used the ACC and LTA on several recent long motorway journeys with my bZ4X in really bad weather just like your conditions. For stop-start and cruising I found ACC gave perfect control -slowing down nicely and then starting up again and maintaining a good distance from the car in front. Quite different to your car, so maybe there is a problem.  On these journeys a lot of road grime had built up on the front sensor panel (found after completed journey) but nevertheless the system still worked fine.  

1 hour ago, bZ4X said: Actually, I manually turned ACC off and on at the begining of this video. Car didn't detect front car at all! When I was too close I pressed the brake and ACC disabled itself. 

I can only say what I see ... there's a certain amount of "messing about" and setting up at the beginning of the video, and then:

• at 12 seconds in the car is travelling at 62mph with ACC set at 70mph and the road apparently 'clear' ahead - the car should be accelerating towards the set speed
• at 13 seconds, the car has reached a speed of 64mph with ACC still set at 70mph but showing detection of a car ahead - the car should be considering matching it's speed to that of the car ahead
• at 14 seconds, the car has reached a speed of 65mph with ACC still set at 70mph and still showing detection of a car ahead - the car should be considering matching it's speed to that of the car ahead
• at 15 seconds, the situation is that same as at 14 seconds in
• at 16 seconds, the car is still at 65mph with ACC set at 70mph but the road ahead is shown as clear so that the car is free to accelerate again
• at 17 seconds, the situation is that same as at 16 seconds in, but now / shortly we see the car ahead brake
• at 18 seconds, the car is up to 66mph and you have, rather sensibly, decided to "take back control" ...

The video doesn't always show the car in front or the ACC display but I would have expected the system to detect the car in front pretty much throughout the video - and, clearly, it doesn't ...

Looking at what Philip has said, with my ACC engaged the car will slow when the car in front slows and will continue to slow after that car has pulled off the lane even though my lane is clear. 

Does it work properly in the dry or is this what it always does?

I must admit I'm not as familiar with its behaviour under braking as I find the car brakes too late and too harshly for my tastes when closing on slowing/stopped traffic at highway+ speeds, so I quickly got in the habit of just jabbing the cancel button if I see cars slowing ahead, so I can let the car coast down well in advance (rather than continue at the same speed and then suddenly brake, which is what the ACC tends to do), and then re-engage it when the traffic speeds up and starts to pull away again.

In very heavy rain, my ACC also "lost" a car and shortly after a message popper up to say the system was in active. I just drove manually until next services. When I stopped later the front was filthy so I think it was the sensors got covered in mucky spray and couldn't cope as once I cleaned them off, it didn't happen again

On Cyker's point, if you do leave 3 bar spacing on ACC it just seems to be an invitation to the following truck to overtake regardless that all lane 1 traffic is travelling at 59.5 mph 😬

1 hour ago, G S said: In very heavy rain, my ACC also "lost" a car and shortly after a message popper up to say the system was in active. I just drove manually until next services. When I stopped later the front was filthy so I think it was the sensors got covered in mucky spray and couldn't cope as once I cleaned them off, it didn't happen again

Can someone confirm that the black plastic plate centre of the front grill is the radar dielectric panel? 

20 hours ago, Roy124 said: Just a thought, are you quite sure you enabled ACC rather than CC?  The behaviour suggests CC which will maintain speed right to the point of emergency braking. 

Yes, first I thought same. I checked that before the video and adaptive cruise control was on not speed limiter.

19 hours ago, philip42h said: I can only say what I see ... there's a certain amount of "messing about" and setting up at the beginning of the video, and then: at 12 seconds in the car is travelling at 62mph with ACC set at 70mph and the road apparently 'clear' ahead - the car should be accelerating towards the set speed at 13 seconds, the car has reached a speed of 64mph with ACC still set at 70mph but showing detection of a car ahead - the car should be considering matching it's speed to that of the car ahead at 14 seconds, the car has reached a speed of 65mph with ACC still set at 70mph and still showing detection of a car ahead - the car should be considering matching it's speed to that of the car ahead at 15 seconds, the situation is that same as at 14 seconds in at 16 seconds, the car is still at 65mph with ACC set at 70mph but the road ahead is shown as clear so that the car is free to accelerate again at 17 seconds, the situation is that same as at 16 seconds in, but now / shortly we see the car ahead brake at 18 seconds, the car is up to 66mph and you have, rather sensibly, decided to "take back control" ... The video doesn't always show the car in front or the ACC display but I would have expected the system to detect the car in front pretty much throughout the video - and, clearly, it doesn't ...

Yes footage is correct. This is how they programmed the acc. Last 5 miles car slowly accelerate. You can test it. You will see after 65 car will slowly accelerate to 70.

I am pretty sure ACC was active 😊 and didn't detect the front car. I was shocked couldn't beleive like you so thats why I recorded video and test it on different lane with a different size car front me. My driver's license is over 20 years old and I actively use ACC for long-distance travel. Maybe this is my cars failure not a common problem. I wanted to inform others just incase, because this is a serous safety bug. 

1 hour ago, bZ4X said: Yes, first I thought same. I checked that before the video and adaptive cruise control was on not speed limiter.

No, speed limiter is a different function.  Cruise control has 2 modes, adaptive and fixed.  I don't know the procedure in the BZ4X, in my Corolla you pressed the CC button to activate ACC or press and hold for 3 seconds IIRC, to engage fixed CC. 

In UK, with busy roads, ACC is probably the better mode.  On the continent with less busy roads and easy passing in lane 2 using FCC is better. 

One other thought, and this may not apply in your case, is the  ACC override function. 

Closing a slower vehicle, if you indicate you want to  pull out this will deactivate ACC and switch to FCC. Once you have moved to lane 2 and stopped indicating the car will revert to ACC. 

3 hours ago, Roy124 said: No, speed limiter is a different function.  Cruise control has 2 modes, adaptive and fixed.  I don't know the procedure in the BZ4X, in my Corolla you pressed the CC button to activate ACC or press and hold for 3 seconds IIRC, to engage fixed CC.  In UK, with busy roads, ACC is probably the better mode.  On the continent with less busy roads and easy passing in lane 2 using FCC is better. 

We have a button to choose functions on steering wheel on bz4x. ACC was activated and speed limit you can see that I increased to 70 mph in the video while ACC was on. I will return tomorrow and will test again today weather is sunny lets see tomorrow. 

BZ4X, the same, and the control for ACC and FCC is the same.  It is possible to select FCC when you thought you had just selected ACC. 

Have a look at your manual and check you have not selected FCC by mistake.  FCC is my TLA. 

On 1/2/2023 at 9:20 AM, Roy124 said: Can someone confirm that the black plastic plate centre of the front grill is the radar dielectric panel? 

I wasn't sure so I washed the whole front of the car and that seemed to work (or could be a complete read herring and just stopping the car and restarting solved it)

23 hours ago, Roy124 said: BZ4X, the same, and the control for ACC and FCC is the same.  It is possible to select FCC when you thought you had just selected ACC.  Have a look at your manual and check you have not selected FCC by mistake.  FCC is my TLA. 

I am %100 ACC was active, you can't confuse them as CC has a different logo. You can make sure ACC was active too just watch video you will only see lane and and horizontal distance lines when ACC active not CC. 

Like below one frum user guide:

Hello everyone I tested my bZ4X again on the motorway with 1 hour driving under different conditions. My results:

1) If the bz4x sensors adjust the car's own speed relative to the car in front, you will see a car logo like the one below.

2) if road is clear or cannot detect car front, then car logo dissappears! Please see below picture:

And somehow bz4x sometimes doesn't detect front car or cant decide 😊 . Maybe  spray thrown up by vehicles affects the sensors. 

I recorded another video today on the return way. And my main concern is not ACC but emergency break. If acoustic sensors cannot detect the distance between two cars won't be able to perform emergency brake as well . See after 00:17 lost the detection! Again, I had to brake to avoid crushing front car at the end of the video. 

19 minutes ago, bZ4X said: You can make sure ACC was active too just watch video you will only see lane and and horizontal distance lines when ACC active

As well as the vehicle in front when the system detects it ... and then loses it again ... 😞

There's something not right and you probably need to get the dealer to look at it.

2 minutes ago, philip42h said: As well as the vehicle in front when the system detects it ... and then loses it again ... 😞 There's something not right and you probably need to get the dealer to look at it.

Thats right it might be only my car. Just wanted share with you as this is a serious safety problem. I will send an email with all my videos and experiences. They should check car logs and report to Toyota JP. 

3 minutes ago, bZ4X said: See after 00:17 lost the detection!

Wow! That's really odd. They do say that the system may miss a car cutting in in front of you, but, in this case it just lost sight of everything.

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Cruise Control Not Shutting Off

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I am interested in whether or not anyone else has had this problem, where the clutch may have been the issue. I have a 2003 Corolla with a 5-speed. About five or six years ago I was using cruise control and wanted to shut it off as I entered the outskirts of a city. I pressed on what I thought was the brake and instead of cruise control shutting off, the engine revved more. The short story is that after turning a right corner at high speed and for a time going into the opposite lane, after about 100 yards I successfully turned off the cruise control. My wife and I and others could have been killed. It was more unnerving. Even while it was happening I was not sure what was going on. I think that I pressed on the clutch pedal rather than the brake, causing the cruise control to try to maintain its speed by further revving up. I have not used any cruise control since then, even for automatic transmissions. I am writing because recently someone commented that, even if the clutch pedal had been pressed, the cruise control would shut off. But I don't know if that is true. Any comments would be appreciated.  

Both the manuals I've had with cruise control have ('95 Soarer and a '18 Corolla) also had a clutch switch which drops the CC out (same as if you hit the brakes) when you press the pedal in to change gear.  

Thanks forsharing your experience. I conclude that at the event I describe, either or both of the clutch switch or the brake switch initially failed. Probably the clutch switch, because of the increased engine revving. Perhaps if I had pushed harder on the clutch it would have switched off, but as soon as I heard the revving I was disconcerted. I'm not sure if I stopped pushing or pushed further.  

Did you bump the switch with your knee? Given it’s location, I’ve done it a few times.  

Bumping the switch with your knee isn't going to do anything bad (certainly not anything dangerous), it'll just slightly increase the setting or re-activate it if it had been cancelled (or even cancel it). The clutch switch not dropping the cruise out also isn't that much of a problem in this case, it's the lack of brake application (which would both cancel the cruise and actually slow the car down). Something people seem to always forget about transmissions in general (both manual and auto) is that dropping in to neutral (or at least clutching in fully on a manual) instantly kills all drive regardless of how high the engine revs, and the brakes are more than capable of pulling up a car even with a decent amount of throttle applied. The danger here wasn't the cruise control not cancelling, but the driver not recognising how to maintain or regain control of a car with a misbehaving throttle (not actually misbehaving in this case, but drive still being applied when it wasn't expected to be due to the missed pedal). The scare stories you have all heard over the years about cruise-control, aquaplaning etc and cars suddenly shooting out of control have all been debunked many times or proven to be due to other problems, not the cruise-control system.  

You can actually break it when you hit it at the right way.  

Please explain. What is "it"? BTW, I was going downhill at the time, only reaching level ground at the intersection where I turned right. So there was extra forward acceleration, which surely added to my sense of urgency. I am sure that if I had bitched to Toyota they would have said something like "you should have known". It took about 15 second to figure out how to brake the car, about ten seconds longer than needed for safety. I am lucky to be alive. If I were a cat and cats have nine lives, then that event would have been one of them.  

“It” refers to the switch for the cruise control. The more I read the posts, I’m more convinced that the issue isn’t the switch. At the same time, I would have to agree that the brake switch didn’t disengage the cruise control. A slight mishap or the old floor mat got wedged into the pedals and not allowing to switch off the cruise control. I wouldn’t know what happened, as I wasn’t there. Glad to hear you weren’t seriously injured. Take extra precautions with the floor mat and use a level road to test the brake switch cancels the cruise control.  

Thanks for the "Glad to hear..." What I remember distinctly is that when I pressed a pedal the engine revved, and craziness ensued. I later deduced that (1) by accident I had pressed the clutch, not the brake, and (2) pressing the clutch does not stop CC. I think that CC had been on for about ten minutes, and when I had to press a pedal I had to, as it were, awaken my muscle memory. Clearly that memory was not accurate enough to immediately distinguish the clutch and the accelerator pedals. In traffic (no CC) I have never gotten them confused. I have not used CC since, not even in an automatic. That way I am both in control, and responsible for what happens. Thanks to all for your responses.  

I’m not even going to argue with you.  

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