Without Scan Tool

LIST OF OPERATION METHODS





By operating each of the air conditioner control switches as shown in the diagram, it is possible to enter the diagnosis check mode.

INDICATOR CHECK





1. Turn the ignition switch on while pressing the air conditioner control AUTO switch and REC switch simultaneously.





2. Check that all the indicators light up and go off at 1 second intervals 4 times in succession.


3. Check that the buzzer sounds when the indicators light up in 2.

HINT:
- After the indicator check is ended, the diagnostic code check begins automatically.
- Press the OFF switch when desiring to cancel the check mode.

DIAGNOSTIC CODE CHECK (SENSOR CHECK)

1. Perform an indicator check. After the indicator check is completed, the system enters the diagnostic code check mode automatically.





2. Read the code displayed on the panel. Refer to the list of codes on page AC-75 when reading the codes. (Codes are output at the temperature display.)






If the slower display is desired, press the UP switch and change it to step operation. Each time the UP switch is pressed, the display changes by 1 step.

HINT:
- If the buzzer sounds when a code is being read, it means the trouble indicated by that code continues to occur.
- If the buzzer does not sound when a code is being read, it means the trouble indicated by that code occurred earlier (such as poor connector contacts, etc.).
- If the ambient temperature is -30°C (-22°F) or lower, a malfunction code may be output even though the system is normal.
- Codes are displayed in order from the smallest code numbers to the largest.
- If the check is being performed in a dark place, diagnostic code 21 (solar sensor circuit abnormal) could be displayed.

In this case, perform diagnostic code check again while shining a light, such as an inspection light, on the solar sensor.

If code 21 is still displayed, there could be trouble in the solar sensor circuit. Inspect the solar sensor circuit.





DIAGNOSTIC CODES





ACTUATOR CHECK





1. After entering the sensor check mode, press the REC switch.

2. Since each damper, motor and relay automatically operates at 1 second intervals beginning in order from 20 in the temperature display, check the temperature and air flow visually and by hand





If the slower display is desired, press the UP switch and change it to step operation. Each time the UP switch is pressed, the display changes by 1 step.

HINT:
- The buzzer sounds when the display code changes.
- Codes are displayed in order from the smaller to the larger numbers.

To cancel the check mode, press the Off switch.