Dual Zone Control Switch

The right air temperature switch is provided to allow the passenger to select air discharge temperatures on the right side of the vehicle. Passenger temperatures can be set independently from the drivers setting. To activate the dual zone, the passenger turns the right air temperature switch to the desired set temperature. The driver and passenger can select any temperatures from full hot, 32°C (90°F), to cold, 16°C (60°F), independently. If the right air temperature switch assembly has been turned on, it can be turned off by pressing the right air temperature switch. Greater sunload on one side of the vehicle may cause the discharge air temperatures to be different, even when the HVAC system is not operating in dual zone mode.

When the left air temperature switch is adjusted, the word DRIVER and PASS will be displayed on the VF display. When the dual zone mode is activated, the word PASS will display under the set temperature to show the offset temperature. When the dual zone system is turned off, the VF display will go back to showing DRIVER and PASS on the display.

The rear fuse block provides power to the right air temperature switch assembly through the ignition 3 voltage circuit. Ground is provided by the low reference circuit, the instrument panel integration module and ground circuit.

The right air temperature actuator is an electronic stepper motor with feedback potentiometers. Zero volts drives the actuator in one direction while 5 volts moves the actuator in the opposite direction. When the actuator receives 2.5 volts, actuator rotation stops. A 5 volt reference signal is sent over the 5 volt reference circuit, from the instrument panel integration module, to the right air temperature actuator. When a desired temperature is selected, whether manual or automatic, the logic circuit is used to determine the right air temperature door position signals value. A separate 5 volt reference is sent from the instrument panel integration module to the logic circuit.

The instrument panel integration module software uses this reference voltage to determine the right air temperature actuators position through the right air temperature door position signal circuit. The motor moves the right air temperature door to the desired position. Ground for the right air temperature actuator are provided by the low reference circuit and instrument panel integration module.