If none of the switch indicators on the air conditioning control assembly illuminate, the following factors may be the cause.
| Symptom | Factor |
|---|---|
| A/C switch indicator does not illuminate | ·
Air conditioning amplifier assembly malfunction ·
Air conditioning control assembly malfunction ·
A/C switch malfunction ·
A/C switch indicator malfunction (including when indicator turned off without switch operation) ·
Servo motor initialization (incomplete) ·
Mechanical locking of damper and damper link ·
Refrigerant pressure is extremely low ·
Low detected ambient temperature (including thermistor assembly malfunction) |
Check the malfunction status of switch indicators on the air conditioning control assembly.
| Result | Proceed to |
|---|---|
| Indicators are not always illuminated | A |
| Indicators are not illuminated only immediately after starting the engine | B |
A
B
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Air Conditioner / Data List.
Read the Data List according to the display on the GTS.
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Ambient Temp Sensor | Thermistor assembly | Min.: -23.30°C (-9.94°F)
Max.: 65.95°C (150.71°F) |
Actual ambient temperature displayed | Thermistor assembly circuit malfunction
·
When open circuit: -23.30°C (-9.94°F) ·
When short circuit: 65.95°C (150.71°F) |
| Tester Display |
|---|
| Ambient Temp Sensor |
The value displayed is 0°C (32°F) or higher.
| Proceed to |
|---|
| OK |
| NG |
OK
NG