9-5 Linear (9600) L4-2.3L Turbo (2.3t) (2004)
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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, rear and top. The plastic housing is coloured so that only
infrared light (heat radiation) can penetrate. The solar sensor is fed B+ pulses from K1 pin 26 and is grounded via K1 pin 22. Voltage from the 5 sensor
elements is sent in sequence to K1 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 K1 pin 26.
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
