Reading Diagnostic Trouble Codes

NOTE: This is the only information provided by the manufacturer for reading diagnostic trouble codes for this system.

PRE-CHECK




1. LIST OF OPERATION METHODS
By operating each of the A/C control switches as shown in the diagram, it is possible to enter the diagnosis check mode.




2. INDICATOR CHECK
a. Turn the ignition switch ON while pressing the A/C 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.




3. 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 Diagnostic Trouble Code Chart when reading the codes. (Trouble code are output at the temperature display.)




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

4. DTC CHECK USING LEXUS HAND-HELD TESTER
a. Hook up the LEXUS hand-held tester to the DLC3.
b. Read the diagnostic trouble codes by following the prompts on the tester screen.
Please refer to the LEXUS hand-held tester operator's manual for further details.




5. CLEARING DTC
a. To clear diagnostic trouble code, there are 2 ways.
1. During sensor check, press the "DEF" switch and "Rr. DEF" switch at the same time.
2. Pull the A/C fuse in passenger side J/B for 20 seconds or longer to clear the DTC memory.




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 UPDr switch and change it to step operation. Each time the UPDr 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.




7. DATA LIST CHECK