I have had trouble with the headlight aiming on my 2021 Limited. I need to talk to the dealer to try to understand how the auto-leveling is supposed to work.
I don't drive at night very much , so I don't know if something changed or this is how they always were. I noticed several months ago that my headlights were pointing really low. So low that I measured the cutoff hitting the road about 25 feet in front of the car. I tried the reinitialization procedure shown in the TSB for the Forester, but it did seem to work as described. The leveler warning never flashed 3 times. When turning on the ignition with the delivery mode fuse in, it just immediately raised the beam to the highest level. After a week or so, the level settled back down to being too low again. I then resorted to manual aiming adjustment with a screwdriver. I adjusted them 10 turns up which measured about level. That was fine for a several months, but then I noticed that they were aimed way too high. I lowered them 10 turns down to factory adjustment. That was fine for a week and then they were too low again. This time I realized what the 1.2% marking on the headlight means and adjusted them to 1.2% down which was about 6 turns up. This is much easier to do with metric units (12cm lower at 10m away). Lately, I noticed that they are aimed too low again. I did the reinitialization procedure and again they pointed way too high. They settled down over the next few days and they are almost where they were before, judging from marks on my garage wall.
When I have visited my family and driven/rode in their Subarus (listed in my signature), I paid attention to the headlight aiming. Their headlights have not been touched from factory adjustment. I know the Ascent works because when we load it up for vacation, the headlights lower to the appropriate height (unlike our previous Pilot Elite). My brother's Crosstrek is equipped identically to mine (but 3 months newer) and it seemed to have appropriate headlight aim.
I've heard a rear ride height sensor mentioned in regards to auto-leveling but I have not been able to put eyes on one under my car. Looking at the parts diagram for my 2021 Limited, there is a Head Lamp Level Sensor in the schematic, but no actual part listed. There appear to be three versions of Auto Leveling Modules. Two are labeled "except vehicle height sensor" and one is labeled "for vehicle height sensor". I attached a picture of the module out of my Crosstrek. It is mounted under the dash near the steering column. The part number matches the diagram and the mounting point matches the "except vehicle height sensor" versions. This makes me conclude that my Crosstrek does not have a ride height sensor. So how does it know how to level the headlights? I assume it takes inputs from the yaw, acceleration, etc sensors in the car.
I can't seem to find much info online about how this system is supposed to work. I think it is different than the ride height sensor version that is in the larger Subarus considering the part diagram and that the reinitialization doesn't work the same. If anyone has information about how this system is supposed to function, please share.