General Information

When the mode switch is pressed, a signal is sent from the HVAC control module to the IPM and on to the mode actuator through the mode door control circuit. When the logic circuit receives the signal, the mode actuator moves into the desired position.

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

The HVAC control module is the interface between the vehicle operator and the IPM. The HVAC control module receives power from the rear fuse block on the ignition 3 voltage circuit. The IPM is also powered from the rear fuse block through the ignition 3 voltage circuit along with the battery positive voltage circuit. Both modules are grounded through the ground circuit.

The mode 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 out over the 5 volt reference circuit, from the IPM, to the mode actuator. When a desired mode setting is selected, whether manual or automatic, the logic circuit is used to determine the mode door position signals value. A separate 5 volt reference is sent from the instrument panel integration module to the logic circuit. The IPM software uses this reference voltage to determine the mode actuators position through the mode door position signal circuit. The motor moves the mode door to the desired position. Ground for the mode actuator are provided by the low reference circuit and IPM.