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Rain Sensor

pburv Jan 18, 2016

  1. pburv

    pburv Registered User

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    Hi All.
    I am in the process of retro fitting Auto Dim rear view mirror .
    Whilst taking the back off the existing mirror I noticed that there are wires already connected to a rain sensor on the windscreen..
    The question I am asking is it just a matter of coding the car via vcds to activate auto wipers??
    My car is not fitted with auto wipers or lights..
    Cheers Paul :chuncky:
     
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  3. Rob2k68

    Rob2k68 Well-Known Member VCDS Map User

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    Hmm good result that the sensors there !! - you'll need the light switch and wiper stalk too I would have thought to get both working best person to help is @DJAlix or @NHN
     
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  4. pburv

    pburv Registered User

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    Cheers Rob.
    I was more interested in getting the Auto mirror fitted Just thought coding the car for Auto wipers was a simple and cheap mod considering I thought that the sensor was already there..
    I wonder if all A3/S3 models have the sensors fitted from factory?
     
  5. DJAlix

    DJAlix VAG Car Coding™ Limited Site Sponsor Gold Supporter VCDS Map User VAG Can Professional ODIS (Offboard Diagnostic System)

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    Are you sure what you have is a rain sensor and not just a humidity sensor, which is fitted as standard with Auto Climate Control? Rain sensors normally only come fitted it you have factory Auto Lights / Wipers. Best way to tell:
    • Load up VCDS
    • Run an Auto Scan and see if "RLFS" shows up under your 09 Cent Elect details.
    or
    • Load up VCDS.
    • Select 09 Cent Elect
    • Select Long Coding
    • From the Drop Down box in the pop up see if you can select RLFS

    RLFS = Rain Light and Humidity Sensor (8U0-955-559-B)

    No stalk needed for Auto Wipers & Lights, just a new light switch with an Auto position.
     
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  6. pburv

    pburv Registered User

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    Thanks for the reply.
    Unfortunately I don't have access to vcds As to whether it is a humidity sensor or rain sensor I wouldn't have a clue..
    This is a picture of the back of the sensor....
    [​IMG]
    [​IMG]
    [​IMG]
    Sorry about the poor picture quality...
     
  7. DJAlix

    DJAlix VAG Car Coding™ Limited Site Sponsor Gold Supporter VCDS Map User VAG Can Professional ODIS (Offboard Diagnostic System)

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    Pictures are not showing up :(
     
  8. pburv

    pburv Registered User

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    Oh! Not sure why that is..They show up on my computer??
    Any ideas as to why??
    So Sorry:concern:
     
  9. DJAlix

    DJAlix VAG Car Coding™ Limited Site Sponsor Gold Supporter VCDS Map User VAG Can Professional ODIS (Offboard Diagnostic System)

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    No worries. This is a photo of a Humidity Sensor. You might be able to make out some part / reference numbers from yours to match up to this one. DO NOT remove yours in order to see. Although held in with a metal clip it's also secured by a gel pad which secures it against the windscreen, which is single use only and will 10000000000% need to be replaced if damaged.
     

    Attached Files:

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  10. pburv

    pburv Registered User

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    OOPs I did remove it today??
    How will I know if it's damaged??:sadlike:
     
  11. DJAlix

    DJAlix VAG Car Coding™ Limited Site Sponsor Gold Supporter VCDS Map User VAG Can Professional ODIS (Offboard Diagnostic System)

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    Did you see a circle of gel stuck to the windscreen when you did, and if so was it damaged in anyway?

    To be honest you would prolly be ok if you only have a humidity sensor as the "sensor" part is on the lower section and not the main body. If fitting a rain sensor then you will need a new one as there needs to be a solid and clear bond to the screen for proper operation.

    Edit: The white'ish dot on my sensor body is a reflection. Infact... I just thought of another identification method. Look at the sensor from outside your car and through the windscreen. If you can see a clear / glass LED type dot on the lower section of the circle then you have an RLFS.
     

    Attached Files:

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  13. pburv

    pburv Registered User

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    Cheers DJAlix.
    No I don't have the extra clear dot on the windscreen..
    Hopefully I haven't damaged anything.Thanks for clarifying what that component is.Looks like I will need to buy an extra cable from Kufatec to enable the Auto Dim mirror...:friends:
     
  14. DJAlix

    DJAlix VAG Car Coding™ Limited Site Sponsor Gold Supporter VCDS Map User VAG Can Professional ODIS (Offboard Diagnostic System)

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    I did the same :) Just waiting on weather to get a little better before installing.
     

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  15. pburv

    pburv Registered User

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    Can I be a bit cheeky and ask how are you going to wire it up??
    Could you possibly put up a wiring diagram??
    Oh! and what part number the cable is...:whistle2:
    Cheers mate...
     
  16. DJAlix

    DJAlix VAG Car Coding™ Limited Site Sponsor Gold Supporter VCDS Map User VAG Can Professional ODIS (Offboard Diagnostic System)

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    Sure. Part Numbers in the photo :)

    To install I was gonna follow the official Audi workshop diagrams. Will post up a dropbox link later.
     

    Attached Files:

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  17. pburv

    pburv Registered User

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    Your a star DJAlix....
    [​IMG]
     
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  18. DJAlix

    DJAlix VAG Car Coding™ Limited Site Sponsor Gold Supporter VCDS Map User VAG Can Professional ODIS (Offboard Diagnostic System)

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  19. veeeight

    veeeight I am a very pretty girl VCDS Map User

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  20. pburv

    pburv Registered User

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  21. Johrul

    Johrul Registered User

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    Hey ladies and gents I really need some help please and will appreciate any thing you guys can help me with. I have a 65 plate Audi A3 saloon sline. I have the climate control sensor already installed and the dimming rear view mirror. I want to retrofit the ligh/rain sensor on my own aswell as the coding using VCDS. Please tell me which parts I will need. Rain sensor, light switch with auto option and 2 front fog light buttons . Will I need anything else a wiring loom? And gel pad?
     
  22. Johrul

    Johrul Registered User

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    Also how do I wire the the new light switch is there anything extra needed for the auto switch and also how do I take the light switch out correctly.please will appreciate your help
     
  23. CB98

    CB98 Registered User

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    I don’t have auto headlights but when I go into a tunnel or it’s dark outside the lights on my dials dim down. I guess there must be a light sensor fitted. Would I be able to get auto headlights activated by simply changing the switch?
     
  24. DJAlix

    DJAlix VAG Car Coding™ Limited Site Sponsor Gold Supporter VCDS Map User VAG Can Professional ODIS (Offboard Diagnostic System)

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    Interior ambient lighting is controlled via a sensor located within your instrument cluster. This sensor cannot be used for Auto Lights and Wipers.
     

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