The driver may select the following different modes of
operation:
| • | DEFOG (FLOOR/WINDSHIELD) |
When operating in AUTO mode, the instrument panel module (IPM) may operate
in several different modes:
If the heater and A/C control is not turned OFF, the IPM will also execute
one of three purge modes at the start of each ignition cycle.
Off Setting
The HVAC control module does not operate when this setting is selected.
Auto Setting
The blower motor turns ON. The IPM automatically controls the blower
speed. The driver may override the automatic blower control once the HVAC
control module is taken out of the auto setting.
The IPM evaluates the information supplied by the following components:
| • | The heater and the A/C control |
The IPM determines which one of the following modes is required:
The IPM energizes the mode actuator to command the program-determined
mode.
The information that is supplied to the IPM determines whether the system
will draw the outside air in or recirculate the inside air.
Defog Setting
The IPM energizes the mode actuator to:
| • | Open the defroster door slightly |
| • | Position the AC/Floor door to direct air through the floor outlets |
Air is delivered to the floor and windshield outlets.
Bi-Level Setting
The IPM energizes the air inlet and mode actuators to:
| • | Close the defroster door |
| • | Position the A/C door to direct air through the panel and floor
outlets |
The IPM energizes the air mix actuators to:
| • | Determine the proper air discharge temperatures |
| • | Position the air mix valves accordingly |
Panel Setting
The IPM energizes the mode actuator to:
| • | Close the defroster door |
| • | Position the A/C door to direct air through the panel outlets |
The IPM energizes the air mix actuators to:
| • | Determine the proper air discharge temperatures |
| • | Position the air mix valves accordingly |
Floor Setting
The IPM energizes the mode actuator to:
| • | Close the defroster door |
| • | Position the A/C door to direct air through the heater outlets |
| • | Direct a small amount of air through the windshield outlets |
The IPM energizes the air mix actuators to:
| • | Determine the proper air discharge temperatures |
| • | Position the air mix valves accordingly |
Front Defrost Setting
The blower motor turns ON. You may manually adjust the blower speed
using the fan switch. The A/C compressor activates if the outside temperature
is above 3°C (38°F).
The IPM energizes the air inlet and mode actuators to:
| • | Open the defroster door |
| • | Position the air inlet door to the outside air position |
| • | Position the A/C door to direct a small amount of air through
the floor outlets |
The IPM energizes the air mix actuators to:
| • | Determine the proper air discharge temperatures |
| • | Position the air mix valves accordingly |
The A/C compressor may still operate in Defrost even if A/C OFF is selected.
The A/C OFF request will be applied to the next manual mode selected.
You cannot force Recirc in Defrost.
Recirc Setting
When you select the recirc mode, the programmer energizes the air inlet
actuator. The air inlet actuator positions the air inlet valve to the recirculate
position.
The recirc mode operates in the following modes:
Recirc is not allowed during the DEFROST mode. This may cause windshield
fogging.
The RECIRC function will operate for the entire ignition cycle. Pressing
the RECIRC button with the system OFF will wake the system up in the AUTO
mode with RECIRC selected.
