DESCRIPTION If the airflow
from the front registers is weak regardless of the blower speed setting
displayed on the air conditioning control panel (radio and display
receiver assembly), the following factors may be the cause. |
Symptom | Factor |
- Airflow volume is constantly low
- Airflow volume sometimes becomes low
|
- Blower motor with fan sub-assembly malfunction
- ECO mode control of air conditioning system is enabled
- Clogged clean air filter
- Clogged No. 1 cooler evaporator sub-assembly or heater radiator unit sub-assembly fins
- No. 1 cooler thermistor malfunction
- Aspirator not connected properly
| PROCEDURE
| 1. |
CHECK AIR CONDITIONING SYSTEM | (a) Operate the blower switch with the following conditions met and check that the airflow volume changes. |
Blower Speed | Condition | |
LO → HI |
- Temperature setting: MAX COLD
- Air outlet mode: FACE
- A/C switch: Off
| OK: Airflow volume increases.
| NG |
 | GO TO OTHER DIAGNOSIS PROCEDURE (Blower Motor Circuit) |
|
OK |
 | |
| 2. |
CHECK ECO MODE SETTING | (a) Check if the ECO mode indicator is off.
OK: The ECO mode indicator is off.
| OK |
| GO TO STEP 4 |
|
NG | |
| |
| 3. |
CHECK ECO MODE CONTROL OPERATION | (a)
Operate the ECO switch assembly (electric parking brake switch
assembly) and check that the ECO mode indicator turns off and the blower
speed reduction is canceled.
HINT:
- When ECO mode control is operating, the air conditioning amplifier
assembly controls the air conditioning system to enhance fuel
efficiency. Therefore, explain to the customer that, when ECO mode
control is operating, the blower speed will be reduced.
|
Control |
Outline |
|
Blower Control |
When
the air conditioning system is in AUTO mode, the blower speed will be
reduced to a certain speed. Additionally, if warm-up control is
operating, the blower speed will be further reduced. |
|
Air Inlet Control |
If the ambient temperature is a certain value or more, the air inlet mode will be changed to recirculation mode.
|
- In some situations, ECO mode control may not operate even though it is enabled.
|
Result | Proceed to | |
ECO mode indicator turns off and blower speed reduction is canceled |
A | | ECO mode indicator turns off, but the blower speed reduction is not canceled |
B | | ECO mode indicator does not turn off |
| B |
| GO TO ECO Switch Circuit |
|
A | |
| |
| 4. |
CHECK CLEAN AIR FILTER | (a) Visually check the clean air filter.
Click here  OK: The clean air filter is not dirty or clogged.
| NG |
| REPLACE CLEAN AIR FILTER |
|
OK | |
| |
| 5. |
CHECK NO. 1 COOLER THERMISTOR | (a) Check the installation condition of the No. 1 cooler thermistor.
OK: The No. 1 cooler thermistor is installed correctly.
| NG |
| INSTALL NO. 1 COOLER THERMISTOR CORRECTLY |
|
OK | |
| |
(a) Check the installation condition of the aspirator.
OK: The aspirator is installed correctly.
| OK |
| REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY OR NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY |
| NG |
| INSTALL ASPIRATOR CORRECTLY | | 
