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| The display value for the sunlight penetration photosensor -G107- can be altered by aiming a suitable lamp at the sensor. |
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| If, irrespective of the illumination of the sunlight penetration photosensor -G107-, the sunlight penetration display is always approx. 900 W per m2 (corresponding to roughly 4.5 V), use current flow diagram to check for interchanged wiring to sunlight penetration photosensor -G107-. |
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| The sunlight penetration value displayed is governed to a considerable extent by the season and time of day as well as by the location of the vehicle (in Central Europe, the display with maximum sunlight penetration in summer will be up to approx. 900 W pro m2). |
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| If a fixed value is always displayed in zones “1” to “4” irrespective of sunlight penetration (e.g. 100 W), check assignment of sunlight penetration photosensor -G107- to operating and display unit, Climatronic control unit -J255-. |
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| There are different versions of the operating and display unit, Climatronic control unit -J255- and the sunlight penetration photosensor -G107-. Attention must therefore be paid to the exact assignment when replacing an operating and display unit → Parts List. |
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| As of chassis number “400000” in Model Year 2005 (Saloon and Avant) and “012913” in Model Year 2005 (Cabrio) → Part catalogue, vehicles have been fitted with a modified sunlight penetration photosensor -G107- and a modified operating and display unit, Climatronic control unit -J255-. Operating and display units, Climatronic control unit -J255- with part no. index up to “AH” are only to be fitted with the sunlight penetration photosensor -G107- with part no. 8E0 907 539. Operating and display units, Climatronic control unit -J255- with part no. index “AJ” onwards are only to be fitted with the sunlight penetration photosensor -G107- with part no. 8P0 907 539 → Parts List. |
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| In the event of incorrect assignment between the sunlight penetration photosensor -G107- and the operating and display unit, Climatronic control unit -J255-, the operating and display unit, Climatronic control unit -J255- cannot evaluate the signal from the sunlight penetration photosensor -G107- and there will be problems with air conditioner control. |
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