Pre-Check

1. WARNING FOR A/C COMPRESSOR LOCK
If compressor lock occurs during air conditioning operation, the A/C switch indicator on the air conditioning control assembly starts blinking to warn the driver.
When this occurs, check for compressor lock (DTC 22) using DTC check then proceed to inspect the circuit or the component.





2. LIST OF OPERATION METHODS
By operating each of the air conditioning control switches as shown the diagram below, it is possible to enter the diagnosis check mode.








3. INDICATOR CHECK
(a) Turn the ignition switch on while pressing the air conditioning control AUTO switch and R/F switch simultaneously.
(b) Check that the indicators light up and go off at second intervals 4 times in succession.

HINT:
- After the indicator check is completed, the system enters the DTC begins automatically.
- Press the OFF switch when desiring to cancel the check mode.








4. DTC CHECK (SENSOR CHECK)
(a) Perform an indicator check. After the indicator check is completed, the system enters the DTC check mode automatically.
(b) Read the code displayed on the panel. Refer to the list of codes when reading the codes. (Trouble code are output at the temperature display.)
(c) If the slower display is desired, press the front DEF switch and change it to stepped operation. Each time the front DEF switch is pressed, the display changes by 1 step.





5. CLEARING DTC
(a) Pull out the ECU-B fuse in engine room J/B for 10 sec. or longer to clear the DTC memory.
(b) After reinserting the fuse, check that the normal code is output.








6. ACTUATOR CHECK
(a) After entering the DTC check mode (Sensor Check Mode) press the R/F switch.
(b) Since each damper, motor and relay automatically operates at 1 second intervals beginning in order from 10 in the temperature display, check the temperature and air flow visually and by hand.
If the slower display is desired, press the DEF switch and change it to step operation. Each time the DEF switch is pressed, the display changes by 1 step.

HINT:
- Code are displayed in order from the smaller to the larger numbers.
- To cancel the check mode, press the OFF switch.