9000 CSE V6-2962cc 3.0L DOHC (B308) (1996)
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Ambient Temperature Sensor / Switch HVAC: Description and Operation
Outside Temperature Sensor
Outside temperature reading is received from the EDC which has an outside temperature sensor.
The EDU control module sends a temperature signal to the ACC control module. This signal consists of a series of pulses where the number of
pulses indicates temperature.
The pulse sequences are separated from each other by a pause of 400 ms so that the ACC control module has time to register each sequence.
Cabin temperature is adjusted so that the physical experience of the selected temperature is achieved. This means that the actual cabin temperature
is higher than the selected temperature on the ACC display.
If there is no outside temperature reading when the ACC control module is switched on, a default reading of 44 °C (47 °F) is set.
If a fault arises in the outside temperature data while the unit is switched on, the last valid data is used.
