I own a 2017 Highlander Limited AWD which is coming up to its 2nd anniversary in December. I have enjoyed using the automatic high beam feature but recently it has become a bit unstable. I will be driving along the highway on a dark night and intermittently the system will shut itself off (ie. the indicator on the dash disappears and the bright lights refuse to come on). A few minutes later the indicator re-appears on the dash and the system begins to work again. Within a 45 minute drive the other night, it did this routine 4 times! I have found the exact same problem written up by at least 5 people on the RAV4 forum. The two themes that have emerged from their descriptions are a) the problem begins to show itself after the vehicle is about a year old and b) the onboard computer sets no codes when the problem occurs. The first theme tells me that the problem is likely related to physical wear on a component rather than some sort of computer glitch. The fact that no codes are set indicates that the computer doesn't know a problem exists. It probably thinks that the driver manually turned off the system and then back on. There are really only two components at play here that are able to turn off the system and then turn it back on without the driver doing anything. If the push button (below left of the instrument panel) were to lose contact intermittently, the bright lights would come on when you don't want them to. This is not what is happening so I have excluded this possibility. However, if the turn signal stalk were to lose contact (when pushed forward to turn on the bright lights) then the system would turn off and the normal lights would stay on. This is exactly what is happening. I have passed all this information on to my local Toyota dealer and have set up an appt. for December 11th. In advance they have ordered a new turn signal stalk since that appears to be the most likely culprit that has gone flakey. It's interesting to note that Toyota has yet to acknowledge any of the RAV4 customer problems. It's obviously very difficult to diagnose and pretty much impossible to recreate in the shop. I'll be trying my best to recreate the problem between now and my appt. in an effort to exclude the possibility that it was some sort of one time glitch that will never re-occur. I'm convinced that the problem is a physical wear issue with the turn signal stalk. I'll repost results once I get thru the dealer appt.