All the HVAC control module diagnostic trouble codes (DTC) are displayed with a blink code on the A/C, recirculation and rear defrost LED's. The DTC will flash after diagnostic mode is entered. If there is no DTC present all of the LED's will flash quickly. If a DTC is present, the rate at which the LED will flash will be slower than the quick flash associated with no DTC. The LED will flash 8 times then repeat this until the code is cleared or ignition is turned OFF. To enter diagnostic mode perform the following procedure:
• | A/C request switch |
• | Recirculation switch |
• | Rear defrost switch |
DTC | Flashing Switch LED | Code Description |
---|---|---|
001 | Rear Defrost Switch | Mode Actuator Failure |
010 | Recirculation Switch | HVAC Control Module Failure |
100 | A/C Request Switch | Air Temperature Actuator Failure |
There is only one DTC for each of the HVAC control module switch LED's. If there is only 1 DTC that LED will flash 8 times slowly while the other LED will flash quickly to indicate no DTC. If multiple DTC are set they will flash 8 times slowly.
Refer to Symptoms - HVAC Systems - Manual if a DTC is present. To exit diagnostic mode turn the ignition to the OFF position.