9-5 Sport Wagon (9600) V6-3.0L Turbo (B308) (2003)
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Solar Sensor: Description and Operation
Solar Sensor
The solar sensor, located at the top of the dashboard, contains 5 solar cells: LH, RH, front, back and top. The plastic housing is coloured so that only
infrared light (heat radiation) can penetrate. The solar sensor is fed B+ pulses from pin 16 and is grounded via pin 36. Voltage from the 5 sensor
elements is sent in sequence to pin 17 of the ACC unit.
For the control module to be able to identify which solar cell is reporting, each transmission is begun with the pulse pattern 5 V - 0 V - 5 V. The control
module synchronises the solar sensor pulse transmissions by sending short ground pulses of 25 Hz from pin 16.
The control module uses the voltage from the 5 solar cells to calculate the sun's intensity, bearing and height.
The values are used to calculate the current temperature at head height for the front seat passenger and driver. The following are also used as default
values:
-
outside temperature
-
time since engine last ran
-
time since start
-
blended-air temperatures
-
fan speed
The calculated temperatures are compared to those the driver and passengers have set on the ACC unit display. The set temperature is adjusted with
