Auto wipers problem-R230

[reflexboy]

Guys, just recently the auto/intermittent setting for my wipers has been playing up. When the wipers are put on the 1st setting on the control stalk (int/auto) the wipers wipe once as they should and then won't wipe intermittently or speed up and slow down according to how heavy the rainfall is. They don't wipe at all. Randomly, they will wipe about every five or six minutes, but the level of rainfall has no affect on when this single wipe occurs.
I was wondering if the wire had become loose on the sensor so took the covering off behind the RVM on the windscreen and found three separate sensors. All wires look OK. I have taken a picture of what I saw from the inside and the outside. Any idea which sensor is which?
I presume one is an ambient light sensor and one the rain sensor, and no idea what the other one is. The lowest sensor seems to have two round 'windows' and the middle one (which shows up blue with the flash of my camera) seems rectangular and has a sort of red LED. Although you cannot see it in the picture, it seems to have a couple of small bubbles in where it's stuck to the screen. Could this be the rain sensor and the problem? Any ideas how I can test it and exactly what the three sensors are? TIA

 

[kamalpatel12448]

How about covering one at a time for ambient light sensing test, watering can for rain detection? No idea about the third one but I'm sure it has beendiscussed before so siggest searching.

This has got to be very annoying, hope you get it sorted.

Kamal

 

[dokalj]

Has your windscreen ever been changed? Sometimes, the rain sensor needs re-calibrating with the screen.

If the wiring has ever been disconnected with the ignition on it may have erased the presence of the rain sensor.

A simple STAR test would help, although if its an obvious problem keep at it

 

[mersum1es]

But sensor plug off, rain sensitive system should work as a normal intermittent one. So I think sensor is recognized but giving false signal (or not calibrated like suggested above)...

 

[reflexboy]

Sensor now disconnected and it works just fine as a normal intermittent.