Reading and Clearing Diagnostic Trouble Codes
How to Troubleshoot the Climate Control System
How to Check for DTCs with the HDS
There are three methods used to check for DTCs. The recommended method is to use the Honda Diagnostic System (HDS) with the appropriate software, plugged into the data link connector (DLC).
The second method is to run the self-diagnostic function built into the climate control unit.
The third method is to use the B-CAN system diagnosis test mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.
1. Make sure the ignition switch is in LOCK (0).
2. Connect the HDS to the 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 does not, go to the DLC circuit troubleshooting Testing and Inspection.
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.
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 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 does not, go to the DLC circuit troubleshooting Testing and Inspection.
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 HDS
The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the following:
NOTE: Before troubleshooting the climate control system, refer to B-CAN System Diagnosis Test Mode A Troubleshooting Troubleshooting - B-CAN System Diagnosis Test Mode A.
1. Turn the ignition switch to ON (II).
2. Press and hold the three buttons (Menu, Map/Guide, and Cancel), and keep them pressed for about 5 seconds. The display screen will go directly to the "Select Diagnosis Items" menu.
3. Use the interface dial to select Self-Diagnosis, then select A/C. The screen will go to Aircon, then select Aircon Diag.
4. Press and hold the OFF button, then press the rear window defogger button five times within 10 seconds. Release the buttons. All the LEDs blink for 2 seconds, then the self-diagnostic function begins.
NOTE: The blower motor should run at various speeds when in the self-diagnostic mode.
- If there is any problem in the system, the display will indicate it. To determine the meaning of the indication, refer to the table that follows.
- If there are no problems detected, the display will show normal.
Canceling the Self-Diagnostic Function
- 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 malfunctions.
Checking for DTCs
NOTE: In the case of multiple problems, the display panel will indicate them all. If the navigation display indicates TR sensor open, TAM sensor open, TS sensor open, TE sensor open, DrVENT sensor open, PaVENT sensor open, and PRE sensor open at the same time, there may be an open in the common ground wire.
Displaying Sensor Inputs at the Climate Control Unit
The climate control unit has a mode that displays sensor inputs it receives. This mode shows you what the climate control unit is receiving from each of the sensors, one at a time, and it can help you determine if a sensor is faulty.
Checks before using the sensor input display mode
1. Turn the ignition switch to ON (II), then select AUTO and check the recirculation door function; press the recirculation button to switch from FRESH to RECIRC. The air volume and sound should change slightly.
2. Adjust the temperature control knob to the desired test temperature. When selecting the test temperature, note these items:
- "Lo" temperature setting will default to MAX COOL, VENT, and RECIRC.
- "Hi" temperature setting will default to MAX HOT, HEAT, and FRESH.
- 58 through 86 °F settings will use the automatic climate control logic (USA models).
- 16 through 28 °C settings will use the automatic climate control logic (Canada models).
3. Turn the ignition switch to LOCK (0).
Run the sensor input display mode
4. Press and hold both the AUTO and recirculation buttons while starting the engine. Release the buttons.
5. Turn the ignition switch to ON (II).
6. Press and hold the three buttons (Menu, Map/Guide, and Cancel), and keep them pressed for about 5 seconds. The display screen will go directly to the "Select Diagnosis Items" menu.
7. Use the interface dial to select Self-Diagnosis Mode, then select A/C. The screen will go to Aircon, then select Aircon Diag. The display will show the sensor inputs.
NOTE:
- The sensor values will be displayed in degrees Celsius (°C). Use the chart to convert the value to degrees Fahrenheit (°F).
- If the sensor value displays "Er" this indicates there is an open or short in the circuit or sensor. Check for DTCs using the HDS, or refer to checking DTCs by DTC indication.
- If necessary, compare the sensor input display to a known-good vehicle under the same test conditions.
- If the sensor is out of the normal range, refer to the sensor test or substitute a known-good sensor, and recheck.
8. To cancel the sensor input display mode, press the AUTO button or turn the ignition switch to LOCK (0).
Celsius to Fahrenheit Conversion Table
