Sunlight penetration photosensor -G107
A - Sunlight penetration photosensor -G107
B - Defroster vent
C - Connector
The sunlight penetration photosensor -G107 is
located in the windscreen defroster vent.
The air conditioner temperature control is
influenced with the aid of photosensors which record the direct sunlight
The sunlight passes through a filter and an
optical element onto the photodiode. The filter protects the optical element
against UV radiation.
Photodiodes are light-sensitive semiconductor
elements. With no light incursion only a small amount of current can flow
through the diode. When light is penetrating the current flow increases. Thus,
the stronger the light incursion the higher the current.
Consequently, the Climatronic control unit -J255 is able to deduce a higher sunlight penetration from the increase in
current and adjust the interior temperature - the temperature flap and fresh
air blower are operated accordingly.
There are different versions of the sunlight
penetration photosensor -G107. So be sure to use the correct one. If a sunlight
penetration photosensor -G107 not intended for this vehicle is fitted (it
delivers a different signal than configured in the Climatronic control unit -J255), the
Climatronic control unit -J255 will not be able to evaluate the signal from the
sunlight penetration photosensor -G107 and the air
conditioner control will be faulty.
A Air conditioner; Rep.Gr. 87; Removing and
installing sunlight penetration photosensor -G107
A Current flow diagram