Functions and Features
Functions and FeaturesAutomatic interior temperature control
This function enables to maintain the interior temperature at the level specified from the temperature control switch despite of changes in factors such as vehicle speeds, outside air temperature and number of passengers.
Maximum cooling and heating function
You can select FC (Full cool, namely maximum cooling temperature) or FH (Full heat, maximum heating temperature) from the temperature control lever.
Automatic air flow control
Air flow is automatically and consecutively fine tuned according to the specified interior temperature and changes in aperture of the heater unit mix door.
Mode (blow port) control
This function automatically selects either one of the VENT, BI-LEVEL, FOOT or DEF mode for the blow port according to changes of temperature on the blow port. Using the mode switch allows you to select a desired blow port manually.
Intake (switching between the fresh air intake and circulation of interior air) control
The intake (switching between fresh air intake and circulation of interior air) mode automatically selects either FRESH (fresh air intake), MIX or RECIRC (interior air circulation) according to changes of the blow port temperature. Using the intake switch allows you to select a desired intake port manually (in the manual operation, FRESH and RECIRC modes alone are available). Pressing the DEF (defrost) mode switch selects the FRESH (fresh air intake).
Cooler start-up timing control
This function is used for maintaining the air flow at "LOW" level until the evaporator is sufficiently cooled down. It is intended to prevent a large volume of hot air being blowing into inside of a vehicle when the cooler is turned on in hot summer season.
Heater start-up timing control
"LOW" level and also for maintaining the defrost mode until temperature of coolant in the heater core is sufficiently heated. It is intended to prevent a large volume of cool air being blown into inside of a vehicle when the heater is turned on in cold winter season.
Solar radiation quantity offset control
The photodiode on the sun sensor determines solar radiation quantity accurately to offset interior temperature quickly.
Switch position storing function
This function is used for storing switch positions being selected in the immediately preceding operation, namely the last time the ignition has been turned off. It simplifies the setup procedures when restarting the system.
Self-diagnosis function
The self-diagnosis function turned on from the panel switch makes your troubleshooting easier (for detail of this function, refer to the section titled "Self-Diagnosis").
Automatic Air Conditioner Block Diagram:
Control Panel Layout:
Air Control Functions:
Operation and Functions of Control Panel Switches
Auto Switch
1. Pressing this switch turns on the automatic control mode. It resets all manual switches except that for the fan control. However, when the Manual REC is selected for the intake or the Manual Open is selected, the modes are maintained.
2. It causes the A/C (air conditioner) to the ON mode (this function, however, available only when the fan is turned on and also the compressor is turned on because of the given outside air temperature level).
Indication
- The AUTO LED is turned off.
- Currently selected mode for the Mode and Intake are respectively indicated.
- The A/C LED remains turned on even if the compressor has been turned off because of the given outside air temperature level. Pressing the air conditioning switch in this state turns off the A/C LED.
Mode Switch
1. Pressing the VENT, B/L or FOOT switch selects the corresponding mode.
2. When the Auto is selected for the Mode and Intake, pressing the mode switch fixes the Intake to the immediately preceding status.
Indication
- The AUTO LED is turned off.
- Currently selected blow port is indicated.
DEF Switch:
DEF Switch
Press this switch to select the DEF mode.
Indication
- The AUTO LED is turned off.
- The DEF LED and the A/C LED are turned on.
- The indication of the intake LED depends on the system condition.
Intake Switch
Intake Switch:
Pressing this switch sequentially selects a different intake port in the following order.
Indication
- The Auto LED maintains unaffected.
- Currently selected intake port is indicated.
Fan Switch
1. Sets the fan to the specified mode.
2. Even when the fan switch is turned off, status display for the Mode, Intake is maintained.
Temperature Control Knob
1. This knob is operable only when the fan is turned on. It may be used for the MAX control of each block except the fan.
2. When the manual mode is selected for the fan control, this manual mode is maintained.
MAX Control:
MAX Control
Indication
- As long as the MAX control is selected, the immediately preceding indication shall be maintained for the AUTO.
- Status display is provided for others.
Air Conditioning Switch
Pressing this switch turns on or off the A/C (air conditioning) control. (The compressor remains turned off if the fan is turned off and also the compressor has been turned off because of the given outside air temperature level.)
Indication
1. The A/C LED remains turned on even if the compressor has been turned off because of the given outside air temperature level. In this case, however, the AUTO or DEF switch must be turned on and the A/C ON mode must also be turned on (by the MAX/C mode).
2. Pressing the A/C switch from the above state (1) turns off the A/C LED.