9-3 (9440) L4-2.0L Turbo (2007)
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The relay is connected to pin 8 (K18) on the ACC control module, when pin 8 is ground the relay pulls and the heating circuit is activated.
Temperature sensor circuit:
The sensor (254) is ground internally in the ACC unit via pin 12 (K18) and the sensor is fed 5 V from pin 15 (K18) via an integrated 10 KOhm resistor
in the ACC unit. The NTC resistor characteristics mean that the resistance drops as the temperature rises. This means that the voltage measured across
the resistor will at the same time drop with a rising temperature.
