How can I tell if I have a rain sensor? - PeachParts Mercedes-Benz Forum

Graplr · #1 02-09-2011, 09:29 AM

Quote:

Originally Posted by RichardM98

You don't need to throw water on it. The rain sensor is easily visible from the outside. In the center of the windshield about 2-3" down from the trim you can see a purple-blue irridescient spot. That is the rain sensor if you have one. Also if you look on the inside of the windshield in the same spot you will see a small black plastic box which is the cover for the rain sensor.

I'm positive I have the black box on the inside. But I did not see any "spot" on the outside. I am color-blind and it was not very well lit when I was looking so that may be the issue.

Right now it sounds like I have a rain sensor that is not working properly as when I turn it into position I the wipers run constantly no matter if the windshield is dry or damp.

RichardM98 · #2 02-09-2011, 09:56 PM

Quote:

Originally Posted by Graplr

I'm positive I have the black box on the inside. But I did not see any "spot" on the outside. I am color-blind and it was not very well lit when I was looking so that may be the issue.

Right now it sounds like I have a rain sensor that is not working properly as when I turn it into position I the wipers run constantly no matter if the windshield is dry or damp.

Well, it's more noticeable in brighter light.

If a trip to the dealer is inconvenient, just join EPC-net online (it's free). Put in your VIN at the top and then select 'Data Card' from the Tools Menu (?) and then select SA Code. The Rain Sensor is SA Code 345. If it was installed at the factory it will be listed.

Graplr · #3 02-10-2011, 09:12 AM

Quote:

Originally Posted by RichardM98

Well, it's more noticeable in brighter light.

Bingo. I looked at it yesterday in the parking lot at work and it was very noticeable. It definitely has the rain sensor.

When I turn it to position I, it wipes continuously regardless if the windshield is dry or wet. Therefore the rain sensor is not working as should.

RichardM98 · #4 02-10-2011, 09:38 AM

It may be broken but I wouldn't rush to replace it just yet. Some people have reported that they sometimes act flakey. Try it a couple of times during actually rainy conditions and see how it behaves.

Good luck.

Graplr · #5 02-10-2011, 10:07 AM

Quote:

Originally Posted by RichardM98

It may be broken but I wouldn't rush to replace it just yet. Some people have reported that they sometimes act flakey. Try it a couple of times during actually rainy conditions and see how it behaves.

Good luck.

I'm in no rush to replace it. The main reason I wanted to know is because I'm getting my windshield replaced and the operator setting up the appointment told me there were different windshields required for the rain sensor and the cars without the rain sensor.