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Discussion Starter #1
I went to my dealer today to check the rain sensor as it does not function correctly. SA told me the windshield needs to be replaced because it has bubbles in it causing the rain sensor malfunction. Also he mentioned the windshield is not OEM. Can someone tell me what are the part # information on the right lower right corner? It contains DOT xxxx and other text.

thanks.
 

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I went through this last summer. If your windshield does not have the MBZ three-pointed star emblem on it, then it is not OEM. The rain sensor option has a translucent red plastic lens that comes glued to the windshield from the supplier. The actual electronics of the sensor clip onto this lens. I have been told that it is almost impossible to remove the lens once it is glued on, and the part itself is fairly expensive, so it is best to buy the OEM glass with the lens attached.

The glass shop (which is the same company my dealer uses) quoted me $270 for an aftermarket glass with the lens attached, supposedly made by the same supplier as the OEM. When they came to install it, it did not have the lens, so they ended up ordering the genuine MBZ glass with the lens for $520 installed. As it turns out, it had an air bubble under the sensor lens. They offered to replace the glass, but I really did not want to go through the hassle, so they tried to fix it by putting some glue on it (I think it’s the same type used to attach a mirror mount). There is still small area of bubbles, but it does not seem to affect the rain sensor.

If you want to try to fix this yourself, you fist have to remove the mirror (which is no easy task – it slides downward off its mount). Once that is done, you will see the rain sensor electronics attached to the lens. To remove it, you have to release the clips. There are two flush rectangular tabs on the top and bottom of the housing. Simply push in (I believe up) on the tabs to move them which release the housing from the lens. Once that’s done, I am guessing you’d want to use a blow dryer to heat the glue and try to remove the lens, clean it, and then use windshield mirror glue to try to reattach it w/o the bubbles. Otherwise, you are looking at $500+ for a new windshield.

- RODNEY
 

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Would you mind giving me detailed instructions for removing the mirror. I have the MB WIS but it is not clear to me exactly how the mirror is removed on those models with the rain sensor. I have another reason for wanting to remove the mirror.
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Discussion Starter #4
rudeney - 3/22/2005 12:26 PM

I went through this last summer. If your windshield does not have the MBZ three-pointed star emblem on it, then it is not OEM. The rain sensor option has a translucent red plastic lens that comes glued to the windshield from the supplier. The actual electronics of the sensor clip onto this lens. I have been told that it is almost impossible to remove the lens once it is glued on, and the part itself is fairly expensive, so it is best to buy the OEM glass with the lens attached.

The glass shop (which is the same company my dealer uses) quoted me $270 for an aftermarket glass with the lens attached, supposedly made by the same supplier as the OEM. When they came to install it, it did not have the lens, so they ended up ordering the genuine MBZ glass with the lens for $520 installed. As it turns out, it had an air bubble under the sensor lens. They offered to replace the glass, but I really did not want to go through the hassle, so they tried to fix it by putting some glue on it (I think it’s the same type used to attach a mirror mount). There is still small area of bubbles, but it does not seem to affect the rain sensor.

If you want to try to fix this yourself, you fist have to remove the mirror (which is no easy task – it slides downward off its mount). Once that is done, you will see the rain sensor electronics attached to the lens. To remove it, you have to release the clips. There are two flush rectangular tabs on the top and bottom of the housing. Simply push in (I believe up) on the tabs to move them which release the housing from the lens. Once that’s done, I am guessing you’d want to use a blow dryer to heat the glue and try to remove the lens, clean it, and then use windshield mirror glue to try to reattach it w/o the bubbles. Otherwise, you are looking at $500+ for a new windshield.

- RODNEY
RODNEY, thanks for the info. Looks it is too much hassle to make it work. I wish the dealer told me the whole windsheild needs to be replaced before fixing a small star chip on the windshield. ($40.00 for diag. and $75.00 to repaired the chip).
 

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RODNEY, thanks for the info. Looks it is too much hassle to make it work. I wish the dealer told me the whole windsheild needs to be replaced before fixing a small star chip on the windshield. ($40.00 for diag. and $75.00 to repaired the chip).
Holy cow! That’s highway robbery! We have a couple of local windshield repair places that will actually do this for free if you have full-coverage insurance. If not, or if you don’t want to deal with a claim, it’s usually under $50 for a chip/bulls-eye repair. I would see if your comprehensive insurance policy might reimburse at least some of the dealer “stole� from you.

- RODNEY
 

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Would you mind giving me detailed instructions for removing the mirror. I have the MB WIS but it is not clear to me exactly how the mirror is removed on those models with the rain sensor. I have another reason for wanting to remove the mirror.
First you need to remove the plastic cover that sits behind the mirror, over the rain sensor unit. Basically, you just gently pry it off, being careful not to break it. It comes off in two pieces, with the largest piece sliding downward from its mounts on the mirror mount (I know that sounds redundant, but once you remove it, you will know what I mean). With the plastic cover out of the way, you should see that the mirror slides onto a metal mount that is glued to the windshield. IIRC, the mirror slides downward off the mount. It can be fairly tight as there is a spring clip inside the mirror part of the mount that holds it in place. I used a screwdriver and small hammer to “gently� tap on the mirror part of the mount to get it to come loose. Once you do that, you can unplug the wiring harness and the mirror is free.

- RODNEY
 

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Another example of Mercedes gadgetry gone bad. It would be soooooo much simpler if they just offered a couple more extra-slow intermittent wiper speeds.

DelJ
 

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Another example of Mercedes gadgetry gone bad. It would be soooooo much simpler if they just offered a couple more extra-slow intermittent wiper speeds.
I have to disagree. I think the rain sensor wipers are the best invention since keyless remote entry. I hate driving a car with intermittent wipers and having to constantly adjust the speed to account for the given rainfall. I leave my wiper control in the sensor position all the time. When it starts raining, the wipers come on automatically. As it rains harder, they adjust their delay all the way up to “constant�. When the rain quits, they stop. The only problem I have with mine is that it won’t switch to high motor speed when there is a deluge, but I know the later models actually do that.

And by the way, MBZ intermittent wipers do have multiple speeds – it’s just aren’t driver-selectable as it’s tied to road speed.

- RODNEY
 

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Thanks for the info on the mirror removal. When you say slid the plastic cover down, do you mean down along the windsheid or down along the piece the mirror itself is mounted on to disingage.
The rain sensing wipers are the best thing MB has done for wipers in the 20 yrs I've owned MB's.
 

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Thanks for the info on the mirror removal. When you say slid the plastic cover down, do you mean down along the windsheid or down along the piece the mirror itself is mounted on to disingage.
Slide it down parallel to the windshield. Trust me, it’s less complicated than it sounds. Once you get it loose, you will see how everything fits together.

Interestingly enough, I had a heck of a time getting my mirror off for the windshield installer (he didn’t want to touch it as he was afraid he’d break something in my Mur-say-dees). However, a year before that, my wife was driving the truck and managed to pull the entire mirror off in her hand just trying to adjust it.

- RODNEY
 

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Your comparison to keyless entry is quite funny as keyless entry has been a major headache for Mercedes. A family member of mine made the mistake of purchasing an E500 with the infamous keyless entry and has nothing but problems with the system. It is so bad that the car had to be towed one time with the alarm blaring away.

The lame excuse from Mercedes is that there must be another keyless entry card hidden in the car!

DelJ



rudeney - 3/23/2005 12:02 PM

I have to disagree. I think the rain sensor wipers are the best invention since keyless remote entry.
- RODNEY
 

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Your comparison to keyless entry is quite funny as keyless entry has been a major headache for Mercedes. A family member of mine made the mistake of purchasing an E500 with the infamous keyless entry and has nothing but problems with the system. It is so bad that the car had to be towed one time with the alarm blaring away. The lame excuse from Mercedes is that there must be another keyless entry card hidden in the car!
Actually, I wasn’t talking about KeylessGo, but about “RCL� or the generic remote door unlocking that most modern cars now have.

Since you mention the KeylessGo problems your family member had, I will say that I have not heard of any problems like that. The most common problem with KeylessGo is that it simply does not work because of RF interference, such as at an airport or near a broadcast tower, but even that is rare. The new system also is integrated into the SmartKey, so no “card� is used. There were problems with the cards, but mostly because they would get broken in people’s wallets, presumably from sitting on them.

- RODNEY
 

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Discussion Starter #13
Here are some pictures of the rear view mirror and the rain sensor. Looks like the rain sensor lense is all messed up. I will need to call the dealer to find out the cost of the rain sensor unit.

To take out the mirror, take out the small plastic cover on top of the rear view mirror. Once you taken off the top cover you will see a clip, I used a long nose piler to compress the clip and slowly slide the mirror downward. BE EXTREMELY CAREFUL not to pull the mirror toward you!


<img src=http://www.ityu.com/mirror.jpg>
<img src=http://www.ityu.com/rainsensor.jpg>
<img src=http://www.ityu.com/sensoropened.jpg>
 

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Here are some pictures of the rear view mirror and the rain sensor. Looks like the rain sensor lense is all messed up. I will need to call the dealer to find out the cost of the rain sensor unit.
It’s hard to tell from the photo, but I assume you mean the lens is messed up because it has scratches on the flat windshield side of it? By the way, how did you remove it from the windshield? Is it possible you scratched it when you removed it? As for the cost, I believe it is fairly expensive (esp. for a piece of plastic), plus you have to buy the adhesive. I’m not sure how they sell it (as a kit?) but my dealer refuses to replace them – they will only replace the entire windshield because they say they have to deal with too many complaints when they mess with the sensor lens itself. Let us know what you find out!

- RODNEY
 
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