The photo sensor located in the center of main crash pad assembly.
The photo sensor contains a photovoltaic (sensitive to sunlight) diode. The solar radiation received by its light receiving portion, generates an electromotive force in proportion to the amount of radiation received which is transferred to the automatic temperature control module so that the solarradiation compensation will be performed.
In bright place, measure ampere between pin 1 and battery (-) terminal.
In dark place, measure ampere between pin 2 and battery (+) terminal.
Check the ampere in the bright place is higher than in the dark.
The voltage is same as the ampere.
