With Manufacturer's Scan Tool
How to Check for DTCs with the HDS1. Make sure the ignition switch is OFF.
2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Turn the ignition switch ON (II).
4. Select DTCs in the BODY ELECTRICAL/CLIMATE CONTROL MODE menu of the HDS.
5. Check for DTCs. If any DTCs are indicated, write down the DTCs, then go to the indicated DTC troubleshooting. If no DTCs are indicated, refer to symptom troubleshooting. Heating/Air Conditioning
NOTE: After troubleshooting, clear the DTCs with the HDS.