Parked Ventilation

Parked Ventilation

Parked ventilation allows the vehicle interior to be ventilated with ambient air while parked with the engine stopped. Vehicles without a FFBH have parked ventilation only. On vehicles with a FFBH, parked ventilation operates in conjunction with parked heating.

Parked ventilation is controlled by direct selection on the TSD (touch screen display), or by using the TSD to program one or two on/off cycle times in the following 24 hour period. Both the direct selection and programmed time modes of operation are selected when the engine is stopped and the ignition switch is in position I; if required, the key can then be removed from the ignition switch and the vehicle locked. Parked ventilation only operates if the ambient temperature is 16 degrees C (61 degrees F) or more, and is automatically de-activated after 30 minutes, regardless of any programmed 'off' time, to prevent excessive drain on the battery. Parked ventilation is automatically de-activated when the ignition is switched on.

When programmed times for parked ventilation are entered on the TSD, the times are stored in the memory of the instrument cluster and the climate set indicator in the top left corner of the TSD is permanently illuminated.

At a programmed parked ventilation start time, or when parked ventilation is selected on using the TSD, the instrument cluster outputs:
^ A parked ventilation request to the TSD on the I bus
^ A parked ventilation request to the ATC (automatic temperature control) module on the K bus
^ The ambient temperature to the ATC (automatic temperature control) module and GEM (generic electronic module) on the K bus.

On receipt of the messages:
^ The climate set indicator flashes at 2 Hz, to indicate that parked ventilation is active.
^ The ATC (automatic temperature control) module operates the blower at speed 1, opens the face level distribution doors in the heater assembly and closes the windshield and footwell doors.

The ATC (automatic temperature control) module disables parked ventilation if battery voltage is less than 11.4 V.