Reading and Clearing Diagnostic Trouble Codes
General Troubleshooting InformationHow to Check for DTCs with the HDS
1. Make sure the ignition switch is in LOCK (0).
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 to ON (II).
4. Make sure the HDS communicates with the vehicle and the climate control unit. If it doesn't, troubleshoot the DLC circuit.
5. Select HVAC/CLIMATE CONTROL in the BODY ELECTRICAL menu.
6. Select DTCs in the HVAC/CLIMATE CONTROL menu.
7. 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. Symptom Related Diagnostic Procedures
NOTE:
- After troubleshooting, clear the DTCs with the HDS.
- For specific operations, refer to the user's manual that came with the HDS.
How to Use the Self-diagnostic Function with the HDS
1. Make sure the ignition switch is in LOCK (0).
2. Connect the HDS to the data link connector (DLC).
3. Turn the ignition switch to ON (II).
4. Make sure the HDS communicates with the vehicle and the climate control unit. If it doesn't, troubleshoot the DLC circuit.
5. Select HVAC/CLIMATE CONTROL in the BODY ELECTRICAL menu.
6. Select INSPECTION in the HVAC/CLIMATE CONTROL menu.
7. Select CLIMATE CONTROL SELF TEST in the INSPECTION menu.
8. Check for DTCs. If any DTCs are indicated, write down the DTCs, then go to the indicated DTC troubleshooting.
NOTE:
- After troubleshooting, clear the DTCs with the HDS.
- For specific operations, refer to the user's manual that came with the HDS.
How to Use the Self-diagnostic Function Without the HDS
The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the following:
1. Turn the ignition switch to LOCK (0).
2. Press and hold the AUTO and RECIRCULATION buttons, turn the ignition switch to ON (II), then release the AUTO and RECIRCULATION buttons.
3. ALL LCD segments come on for 2 seconds, then the self-diagnostic function begins.
NOTE:
- The blower motor will run at various speeds regardless of what the panel is displaying.
- If there is any problem in the system, the system flashes "AUTO 88" or alternately flashes "AUTO 88" and one or more of the 14 segments (A through P). Refer to checking for DTCs.
- If there are no problems detected, the segments will not illuminate, and the system will appear to be turned off.
Canceling the Self-diagnostic Function
4. Turn the ignition switch to LOCK (0) to cancel the self-diagnostic function. After completing repair work, run the self-diagnostic function again to make sure that there are no other DTCs.
Checking for DTCs
The temperature display indicates single or multiple DTCs. The DTC(s) will be displayed on one of three screens (I, II, III). The system always starts on screen I. Turn the fan control dial clockwise to go to screens II and III, and counterclockwise to go from a higher numbered screen to a lower numbered screen. Check all three screens for DTCs.
- If the DTC is will be displayed on screen I, the system alternately flashes "AUTO 88" and one or more of segments A through P.
- If the DTC is displayed on screen II, "AUTO" is on steady, and the system alternately flashes "88" and one or more of segments A through P.
- If the DTC is displayed on screen III (the FRESH indicator comes on in screen III), the system alternately flashes "AUTO 88" and one or more of segments A through P.
