Does anyone know which fuse controls the rain sensor? I've checked the small paper that is attached to the fusebox lid, as well as a few sources online, and not one listing I have seen yet shows which fuse controls the rain sensor.

How did you manage to blow that fuse?
I don't have this car to help look things up but I have noticed on my car and the previous B-Class the sensor didn't have a fuse of it's own but is tied into the sensor relay.

I installed a dash cam that looks OEM and replaces the housing around the rain sensor with a housing that has the dash cam built in. It isn't working, and I want to rule out the power source as the culprit. Not knowing which wire does what in the harness, I'm hesitant to just start probing it with a multimeter. I'm assuming there is a fuse of some sort for the power source located in that housing but have been unable to find a burnt fuse.

EDIT: Before someone suggests to just turn the wipers on and sprinkle water on the windshield, the wipers only do this when the vehicle is in gear and moving.

My automatic wipers do operate when the car is running and in Park, also when engine off and in accessory mode, if it is raining.

Yeah, mine don't, at least not on Intermittent setting 1. I noticed it when I pulled off the road to take a phone call on a rainy day. As soon I put the car in gear, it did one swipe. As I pulled away it sped up.

Yes, the automatic wipers should work only when driving and for safety, like warming up the car, they do not move but are hard in place. If you turn the car off, they are in service mode to be replaced.

Mine is set to setting 2 all the time as I leave the car to manage the rain and snow and it does a great job.

Did you figure out the issue? I recently bought and tried to install a similar dashcam and lost power to it as well.

Turns out the connector on the camera for plug and play was wired wrong. The positive and negative were reversed. Once I flipped them it worked.

What is the brand of this dashcam please?

I got it from Mercylion. It really looks OEM.

https://mercylion.com/collections/fo...m-for-mercedes

I recently got one from Mercylion too, have you found that it received constant power, even when parking settings are off?

Mine does turn off, but not right away. Not sure if it is a built in capacitor or if it takes a while for the car's electronics to go to sleep. I'm assuming it goes off since I hear the little startup tone when I open my door. I'll have to access the memory card and see if it has been recording the whole time. Since it comes on when I open my door, I'm not sure how I could sneak up on it to see if it is always on unless I crawl through the open window. . lol

Check out your files and see if it's recording even with the car off. Mine catches shadows and other changes even when sitting in my garage and car is locked. I would have never known except I didnt drive my car for a few days and got a battery warning then looked and have lots of videos of nothing.

I just checked. I have Parking mode set to ON, and G Sensor set to medium. That means that when the car is parked, it should only record when it senses a shock, like someone bumping the car. But, that would only be applicable if I had hard wired it to the battery or the fuse box. I have it connected to the rain sensor so it does not have power when I turn the car off. I just checked, and the last video I have is from several days ago, when I last used the car.

Thats interesting, my is constantly drawing power but I have parking sensor off. Maybe I should turn it on and see if that works

Is this a B Class? And you used the plug and play to the connector inside the rain sensor housing? I didn't think there was any power there after the car has been off for a while. Mine came with the plug and play wire to the rain sensor, which I used, and a harness to connect to the fuse box directly if I wanted the camera to work when the power was off.

I have a GLS but I cant imagine they are different setups. Yes I used the rain sensor wire harness.

I can easily imagine the GLS being different. There may be other items in that area which do require key off power, like an alarm, keyless antenna, etc. I did see someone in the GLC forum has the same issue, where there is constant power.

As for the battery being low, I doubt the camera is the main culprit. I think all Mercylion cameras have an under voltage protection so they shut off at 11.5 Volts. Several modern cars have low battery issues when parked for an extended periods.

Its a brand new battery and there was a lot of recording so I do think it was the culprit, but interesting thought that the sensor power might be different. Thanks for the feedback