Rain Sensing Wipers

[DaveMires]

Hello everyone, I know this has been asked many times before on the post, but my syptoms seem to be a little different, and to top it off I am in Seattle, where it seems like it never stops raining!

turn on wipers......wipe once and stop as they should, but then will wipe
again in around 10 seconds, does not change with
speed or with rain.

adjust frequency...wipers do not wipe, and this does not seem to change
frequency of random wipes.

sometimes they will work as they should and sense rain, and adjust speed to amount of water on windscreen, but if I adjust the frequency dial, they will stop working again...odd symptom. I am tempted to change out the sensor, as the windscreen is in great shape and hate to change it for this problem....any suggestions?

Thanks in advance.

[ifly]

Probably a sensor problem. Good luck.

[AzNMpower32]

Assuming you do have rain-sensing wipers, it seems like a sensor problem.

[dzhoka]

I hade it last year, then finally reinstalled new windshild ...and new sensor.
if new r/sensor installed , it must be reprogramed with on board computer..via pro-mechanick bmw facilityes --is preference ( same reprogramming if new windshild!) Or combination of this two.
in ur situation could be software feilier, related to rain sensor ( it meens u might not need to buy a new r-sensor - 199.00usd!or a new windsgield ) but reprogram software.
Short history of my story was:...- one bozo, who had this car before me( probably leased ) , decided to install cheaper version of windshild and also broke short plastic holders for rain sensor itself on the windshield inside car (which was not origin bmw windshield). So.. firstly it took of me a lot of time to varify what exactly is going on, after,.... how to deel with it ..ets..ets..ets..

[gmwtexas]

I had a problem with mine working intermittantly and/or not at all. They replaced the relay first, then the general module and finally on the 3rd trip the wiper motor itself. It would up being the motor.

[DaveMires]

thanks everyone....

It is a 2002 4.6is, and yes it is rain sensing equipped. The windscreen is the original BMW glas with the warning sticker still on the upper LH corner. I took the mirror cover off and checked the connection on the module, all seems okay, and there are no visual bubbles or distortion on the glass, I can see the sensor clearly through the glass.

I guess I may have to break down and have it looked at at a dealership...maybe they can make the key actually move the seats and mirrors to the correct position, not some random out of the blue setting while it is there...might be a computer issue or software issue on both ends?

[e30cabrio]

I have had this issue since I got my X. The windshield was replaced the day I picked it up by the Mercedes dealer I got it from. I have DIS/GT1 how do I program the sensor?

[fmugur]

Originally Posted by e30cabrio

I have had this issue since I got my X. The windshield was replaced the day I picked it up by the Mercedes dealer I got it from. I have DIS/GT1 how do I program the sensor?

You go in the RLS module and initialize it. There is a procedure to "re-learn" the windshield after in GT1. I would use INPA for initialization. Look for RLS = rain and light sensor.

The initialization is performed using the service function "Initialize rain sensor" in the BMW diagnosis system. In the service function, the adaptation values in the rain sensor are deleted. This is followed by adjustment of the sensor system to the windshield based on the following sequence:
· Switching off the rain sensor
· Switch off terminal 15 and terminal R
· Switch on terminal R and terminal 15 and wait 10 seconds

In the 10 seconds waiting period, the new adaptation values are determined and stored.

[e30cabrio]

Thanks, I'll try tonight when I get home.

[X5SND]

Do we have any idea as to why some say the rain sensor needs to be re-initialized after a windscreen replacement and others don't seem to be affected? I just had my windscreen swapped out for a CC glass screen, and don't have any issues with it functioning properly....