S60 L5-2.4L VIN 64 B5244S6 (2003)
Sun sensor (electronic climate control only)
The sun sensor transmits information about sun intensity to the climate control module (CCM).
The sun sensor consists of a photo diode which is supplied with power from the control module. The conductivity of the diode depends on the amount of
light to which it is exposed. The diode is located under a diffusing lens which reduces the sensitivity of the photo diode to the angle of the light hitting it.
Increased sun intensity reduces the voltage over the photo diode. The control module measures the voltage over the photo diode and compensates for
high sun intensity by lowering the ventilation air temperature, changing the distribution of air and increasing the speed of the blower fan.
The climate control module (CCM) starts to compensate the blower fan speed at a sun intensity of 400 W/m2 and reaches maximum compensation at a
sun intensity of 1000 W/m2.
The sun sensor is located in the middle of the dashboard by the windshield.
There are diagnostics for the sun sensor.
Air quality sensor (electronic climate control only, option)
The air quality sensor is available as an option for the electronic climate control from model year 2000. Its function is to transmit a signal to the climate
control module (CCM) if it detects increased concentrations of pollutants in the outside air. The air quality sensor measures the COx and NOx content.
The air quality sensor compares current values with previous ones and can calculate changes in pollutant concentrations.
The signal from the air quality sensor to the climate control module (CCM) is a pulse width modulation (PWM) signal and has four stages, 0-3:
