Control System Outputs

A/C Blower Motor Speed Control
The A/C blower motor speed control is located under the A/C evaporator housing, forward of the blower motor.
- The function of the A/C blower motor speed control is to convert low power signals from the electronic automatic temperature control assembly to a high current, variable ground feed for the blower motor.
- A/C blower motor speed is infinitely variable and is controlled by the electronic automatic temperature control software.
- A delay function provides a gradual increase or decrease in blower motor speed under all conditions.

A/C Electric Blend Door Actuator
The A/C electric blend door actuator is located on the rear of the A/C evaporator housing.
- Its function is to move the A/C air temperature control doors on command from the control assembly.
- The A/C electric blend door actuator contains a reversible electric motor and a potentiometer. The potentiometer wiper is connected to the actuator output shaft and moves with the output shaft to indicate the position of the A/C air temperature control door.
- A 5 volt signal is applied to the ends of the potentiometer. The voltage available at the wiper indicates the position of the potentiometer. The expressed value of the actuator wiper voltage is sent to the electronic automatic temperature control module and is matched with the wiper voltage of the module potentiometer. The control module then drives the actuator motor in whichever direction is necessary to make the actuator wiper voltage agree with the control module wiper voltage.

Vacuum Control Motors
The vacuum control motors:
- are located on the A/C evaporator housing, A/C recirculating air duct and heater air plenum chamber.
- direct system airflow to the vehicle interior as determined by the electronic automatic temperature control module or manual override.

Variable Load Control Module
The variable load control module:
- is located behind the RH front wheel inner splash shield.
- incorporates circuit control provisions for the fan motor and the A/C clutch field coil.
- communicates with the powertrain control module through the multiplex communication network.