Displaying & Reading Trouble Codes - HVAC System - Manual

DIAGNOSTIC TROUBLE CODE (DTC) DISPLAYING

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:

1. Turn Off the ignition.
2. Press and hold the following HVAC control module switches:
- A/C request switch
- Recirculation switch
- Rear defrost switch
3. While pressing the switches, turn the ignition to the Run position.
4. Wait 5 seconds.
5. Observe the switch LED's.
6. The LED's will flash quickly if there is no DTC's are present.




7. If 1 of the LED's flash 8 times then there is an HVAC control module DTC. Refer to the table to determine DTC.

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.