Initial Inspection and Diagnostic Overview
General Troubleshooting InformationHow to Check for DTCs with the HDS
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A.
1. 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 a DTC is indicated, go to the next step. If no DTC(s) is indicated, refer to symptom troubleshooting.
6. Turn the ignition switch OFF.
7. Disconnect the HDS from the DLC.
8. Do the troubleshooting procedure for the DTC indicated.
How to Retrieve a DTC (Without HDS)
The audio-HVAC display panel has a self-diagnostic function for climate control. To run the self-diagnostic function, do the following:
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A.
1. Turn the ignition switch ON (II).
2. Set the driver's temperature control dial or button on MAX Cool.
3. Press and hold the OFF button.
4. While holding the OFF button, press the rear window defogger button five times within 10 seconds. The self-diagnosis will begin.
If there are any problems in the system, the temperature indicator will light up the segment (A through Q) corresponding to the error. The temperature indicator will then alternate every second between displaying "88" (all segments lit) and the error code segment (A through Q).
NOTE: The system will only display the DTC when the AUTO and OFF buttons are pressed. If you release the buttons, the display will go blank. To return the display, simply press the AUTO then the OFF buttons again.
To determine the meaning of the DTC, refer to the DTC Troubleshooting Index. Diagnostic Trouble Code Descriptions If no segments light up, the system is still not operating properly, check the sensor inputs to the climate control unit, or refer to symptom troubleshooting.
Canceling the Self-diagnostic Function
5. Turn the ignition switch OFF 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 the DTCs by DTC Indicator
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A.
To retrieve the DTC, you must run the self-diagnostic function. In the case of multiple problems, the respective indicator segments will come on. If indicator segments A, C, E, G, I, L, and 0come on at the same time, there may be an open in the common ground wire of the sensors.
Displaying Sensor Input 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.
Check these items before using the display mode
1. Turn the ignition switch ON (II), 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. Set the temperature control to the desired test temperature. When selecting the test temperatures, note these items:
- "Lo" temperature setting will default to MAX COOL, VENT, and RECIRC.
- "Hi" temperature setting will default to MAX HOT, FLOOR, and FRESH.
- 61 through 86 °F settings will use the automatic climate control logic.
3. Turn the ignition switch OFF.
To run the sensor input display mode, follow these steps
1. Turn the ignition switch OFF.
2. Press and hold both the AUTO and DUAL buttons, then start the engine.
3. After the engine starts, release the buttons. The audio-HVAC display panel will flash the sensor number and then the value for that sensor. Record the value displayed.
4. To advance to the next sensor, press the rear window defogger button.
NOTE:
- The sensor values will be displayed in degrees Celsius or an alphanumeric code. 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 to check for DTCs.
- If necessary, compare the sensor input display to an alike, known-good vehicle under the same test conditions.
- If the sensor is out of the normal range, refer to the sensor test, or substitute the sensor with a known-good, and recheck.
5. To cancel the sensor input display mode, press the AUTO button, or turn the ignition off.