Recirculation Mode

When the recirculation (RECIRC) switch is pressed, a signal is sent from the HVAC control module to the IPM , and on to the recirculation actuator through the recirculation door control circuit. When the logic circuit receives the signal, the recirculation actuator moves into the recirculation mode. This brings air from inside the vehicle instead of air from the outside.

The rear fuse block provides power to the recirculation actuator through the ignition 3 voltage circuit. Ground is provided by the low reference circuit, the IPM and ground circuit.

The recirculation actuator is an electronic stepper motor with feedback potentiometers. 0 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 out over the 5 volt reference circuit, from the IPM , to the recirculation actuator.

When a desired recirculation setting is selected, whether manual or automatic, the logic circuit is used to determine the recirculation door position signals value. A separate 5 volt reference is sent from the IPM to the logic circuit. The instrument panel integration module software uses this reference voltage to determine the recirculation actuators position through the recirculation door position signal circuit. The motor moves the recirculation door to the desired position. Ground for the recirculation actuator is provided by the low reference circuit and IPM
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The recirculation mode can be used in both automatic and manual operation. The only time recirculation is not available is when FRONT DEFROST is selected. The RECIRC LED will flash to alert the driver that recirculation mode is not available. When manually selected, recirculation will stay on until either the vehicle operator selects OUTSIDE AIR or the recirculation mode has been on for approximately 10 minutes. Pressing the recirculation switch, from the OFF position, will set the blower mode and A/C compressor clutch into automatic mode.