Recirculation Mode

When you press the recirculation (RECIRC) switch, a signal is sent from the HVAC control module to the IPM, and then to the recirculation actuator through the recirculation door control circuit. When the solid state 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 IP 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. 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, the 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 you select a desired recirculation setting, manually or automatically, the solid state circuit determines the position signals value of the recirculation door. A separate 5-volt reference is sent from the IPM to the solid state circuit. The PM software uses this reference voltage in order to determine the position of the recirculation actuators through the position signal circuit of the recirculation door. The motor moves the recirculation door to the desired position. The ground circuits and IPM provide ground for the recirculation actuator.

The recirculation mode is used in both automatic and manual operation. The only time recirculation is not available is when FRONT DEFROST or VENT is selected. The RECIRC LED will flash, alerting the driver that recirculation mode is not available. When in automatic mode, recirculation will stay ON until either the vehicle operator selects VENT or the vehicle ignition is turned OFF. Recirculation turns ON automatically when in A/C mode.