How to Use the Self-Diagnostic Function
How to Use the Self-Diagnostic Function
The HVAC control unit has a self-diagnostic function for the heating, ventilation, and air conditioning system. To run the self-diagnostic function, do the following:
1. Turn the vehicle to the OFF (LOCK) mode and then the ON mode
2. Set the BLOWER CONTROL dial to OFF, the TEMPERATURE CONTROL dial to Max Cool, the VENT button to ON
3. Press and hold the RECIRCULATION button, then within 10 seconds press and release the REAR WINDOW DEFOGGER/MIRROR DEFOGGER* button five times.
*: With mirror defogger
4. The recirculation indicator blinks two times, then the self-diagnostic function begins.
NOTE:
- The blower motor will run at various speeds when in the self-diagnostic mode.
- If there is any problem in the system, the recirculation indicator blinks Diagnostic Trouble Code (DTC) number 1 through 13.
- If there are multiple DTCs, the recirculation indicator blinks each DTC in sequence from the lowest DTC number to the highest.
- If there are no problems detected, the indicator will not blink.
Example of DTC Indication Pattern (DTC 3)
Example of DTCs Indication Pattern (DTC 2 and 4)
| DTC (Recirculation Indicator blinks) | Detection Item |
|---|---|
| 1 | An open in the air mix control motor circuit |
| 2 | A short in the air mix control motor circuit |
| 3 | A problem in the air mix control motor circuit, linkage, door, or motor |
| 4 | An open in the mode control motor circuit |
| 5 | A short in the mode control motor circuit |
| 6 | A problem in the mode control motor circuit, linkage, door, or motor |
| 7 | An open in the recirculation control motor circuit |
| 8 | A short in the recirculation control motor circuit |
| 9 | A problem in the recirculation control motor circuit, linkage, door, or motor |
| 10 | A problem in the blower motor circuit |
| 11 | HVAC control unit internal error |
| 12 | An open in the evaporator temperature sensor circuit |
| 13 | A short in the evaporator temperature sensor circuit |
Canceling the Self-Diagnostic Function
5. Turn the vehicle to the OFF (LOCK) mode, to cancel the self-diagnostic function. After completing the repair work, run the self-diagnostic function again to make sure that there are no other DTCs.