Subaru Solterra Forum banner

Adaptive Cruise not good in rain and now radar blocked?

464 Views 6 Replies 6 Participants Last post by  B C
I have noticed that the Solterra adaptive cruise is pretty bad in rainy situations. It doesn’t disable itself before it malfunctions. I have had at least a half dozen situations where the car has sped up and come alarmingly close to the car in front of me before I manually hit the brake. This issue never occurred in my Outback (2016 or 2019).
In addition, now I am getting errors that my front radar is blocked. It wasn’t blocked, or dirty. It was raining, but this has never happened in the rain before.
Anyone have similar experiences? The ACC thing is pretty disconcerting and making me reconsider trying to do a trade for another outback.
1 - 7 of 7 Posts
I have noticed that the Solterra adaptive cruise is pretty bad in rainy situations. It doesn’t disable itself before it malfunctions. I have had at least a half dozen situations where the car has sped up and come alarmingly close to the car in front of me before I manually hit the brake. This issue never occurred in my Outback (2016 or 2019).
In addition, now I am getting errors that my front radar is blocked. It wasn’t blocked, or dirty. It was raining, but this has never happened in the rain before.
Anyone have similar experiences? The ACC thing is pretty disconcerting and making me reconsider trying to do a trade for another outback.
So do remember that this is a Toyota, not a Subaru. It use’s Toyotas safety sense 3 or something like that and not Subaru eyesight. Eyesight requires two cameras at the top of windshield, solterra only has one. With that being said, adaptive cruise control should always be treated with caution and never 100% relied on. In normal conditions I’ve had it speed up when a car is right there and I’ve had to put the brakes as well but that’s expected as it’s not a human driving, it’s a computer getting data from cameras and the data could be misrepresented by the computer thus creating wrong driving decisions. See Teslas and phantom braking, it’s the cars camera picking up shadows or being blinded by light creating a wrong scenario for the car and making a wrong choice. Your front radar is the plastic circles all around the front bumper. Make sure those are dried and clear. Yes sometimes snow and even heavy rain can obstruct the radar and camera at times. You should never rely on tech and advanced safety features in poor weather. In those conditions, rely on yourself and the brakes at all times.
What’s your problem with ACC? As in the 12v battery can drain if left in ACC mode for too long? With EVs we have to get out of the ICE mindset. Just turn the car to the ready position but in park. It won’t eat traction battery if it’s not moving or using heat and your 12v will stay trickle charging as well. With this being said, Solterra is not for everyone. There are plenty of short comings of it and while it has Subaru badging you have to remember it is in reality a Toyota so comparing it to other Subarus will not be an apples to apples comparison.
See less See more
My adaptive cruise was not reading the lines and came to find a big ole splatter of bird droppings I couldn't see from in the car covering the camera. Something to check if yours ever does stuff that doesn't feel right, run the wipers and clean to help see if that is a factor. There is a lot of other things like light patterns and shadows and sun position that can affect it to.
...Your front radar is the plastic circles all around the front bumper. Make sure those are dried and clear. Yes sometimes snow and even heavy rain can obstruct the radar and camera at times...
The plastic circles are ultrasonic sensors for the object detection at close range which typically drives all the messaging and beeping when backing up around obstacles or if you're seeing the forward camera view at slow speeds with obstacle avoidance noises.

The radar sensor is behind the black bar above the Subaru emblem and is supposed to heat up to keep snow off it, though quite a few people have reported that doesn't work so well.

Wheel Tire Land vehicle Car Vehicle


Font Number
See less See more
2
  • Like
Reactions: 1
The plastic circles are ultrasonic sensors for the object detection at close range which typically drives all the messaging and beeping when backing up around obstacles or if you're seeing the forward camera view at slow speeds with obstacle avoidance noises.

The radar sensor is behind the black bar above the Subaru emblem and is supposed to heat up to keep snow off it, though quite a few people have reported that doesn't work so well.

View attachment 2223

View attachment 2224
thanks for clarity on difference between ultrasonic and radar and their locations!
The millimeter wavelength RADAR is better at judging metallic objects than a second (stereo) camera would be. I am very glad they close that approach. It can also see RADAR reflections off the roadway of a slowing vehicle in front of the one it is otherwise tracking before that vehicle slows.
What’s your problem with ACC? As in the 12v battery can drain if left in ACC mode for too long? With EVs we have to get out of the ICE mindset. Just turn the car to the ready position but in park. It won’t eat traction battery if it’s not moving or using heat and your 12v will stay trickle charging as well. With this being said, Solterra is not for everyone. There are plenty of short comings of it and while it has Subaru badging you have to remember it is in reality a Toyota so comparing it to other Subarus will not be an apples to apples comparison.
Correct me if Im wrong but I think the OP is referring to ACC being Adaptive Cruise Control vs ACC relating to electrical accessory. I get confused too with all this jargons :confused:
1 - 7 of 7 Posts
Top