Stuart's Volkswagen Golf Mk 5/V Forum

Hi Stuart

Read that in March 2006 you adjusted change the sensitivity of the Auto Wipers/Lights sensor with vag com.

Vag-com give guidance:
Coding
Byte 00: Rain Sensor Correction (Infrared Transperency at 880nm)
Byte 01: Light Sensor Correction (Transperency)
Byte 02: Options
+1 = Highway Light
+2 = Rain Light
+4 = Rain Closing
Notes
If a coding needs to be altered, it has to be converted from decimal (dec) to hexadecimal (hex).
Bytes are counted from right to left, starting with 0. This is backwards from what you may be used to from editing Long Codings.
Bits are counted from right to left, starting with 0.
Once converted to hex each byte has to be converted to decimal seperately.
Byte 02 coding is the sum of the individual options.
Example
Coding is "00217165" (dec) = "03504D" (hex)
Byte 00 = 4D (hex) = 77 (dec) = Rain Sensor Correction value is 77%
Byte 01 = 50 (hex) = 80 (dec) = Light Sensor Correction value is 80%
Byte 02 = 03 (hex) = 03 (dec) = 01+02 = Options 01 (Highway Light) and 02 (Rain Light) set

Can I ask what settings you used ? I wish to reduce the light sensitivity did you try any setting on this?

Many thanks in anticipation
Michael (Golf Match 1.9 DSG)

Hi Michael,

Yes I managed to change the light and rain sensor's sensitivity using the same instructions as in your email. There was a little trial and error involved but the original and current codings are shown below:

09-Central Elect.
2 -- 1K0 955 559 M -- RegenLichtSens 005 0605
Original coding:00217125
00217125(dec) = 35025(hex)
Byte 00 = 25 (hex) = 37 (dec) = Rain Sensor Correction = 37%
Byte 01 = 50 (hex) = 80 (dec) = Light Sensor Correction = 80%
Byte 02 = 03 (hex) = 3 (dec) = Hightlight + Rain Light

Changed to:
Byte 00: Rain Sensor Correction: 80% = 80 (dec) = 50 (hex)
Byte 01: Light Sensor Correction: 30% = 30 (dec) = 1E (hex)
Byte 02: Hightlight + Rain Light = 03 (hex)
031E50 (hex) = 00204368 (dec)
Current coding:00204368

I have heard (I think from the Ross Tech Yahoo Discussion group) that they have more luck with adjusting the sensitivity of some rain/light sensors than others. Fortunately my sensor is apparently one of the good ones.

Hope this info is useful. Let me know how you get on,
Stuart