Description of On-Board Diagnostics

DESCRIPTION OF ON-BOARD DIAGNOSIS
System Operation



By operating each of the air conditioner control switches as shown in the diagram below, 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 R/F SW 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 trouble code check begins automatically.

- Press the OFF switch when cancelling the check mode.



DIAGNOSTIC TROUBLE CODE CHECK (SENSOR CHECK)



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







2. Read the code displayed on the panel. Refer to DIAGNOSTIC TROUBLE CODE CHART, when reading the trouble codes. (Trouble Codes are output at the temperature display.)



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







HINT:

- If the buzzer sounds when a trouble code is being read, it means the trouble indicated by that trouble code continues to occur.

- If the buzzer does not sound when a trouble code is being read, it means the trouble indicated by that trouble code occurred earlier (such as poor connector contacts, etc.).



ACTUATOR CHECK








1. After entering the sensor check mode, press R/F 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 a slower display is desired, press the A/C switch and change it to step operation. Each time the A/C switch is pressed, the display changes by 1 step.



HINT:

- The buzzer sounds when the display trouble code changes.

- Code are displayed in order from the smaller to the larger numbers.



To cancel the check mode, press the Off switch.

Display Code Chart: