Rear Heater-A/C
Rear Heater-A/C Control SystemHow to Retrieve a DTC
The climate control unit has a self-diagnosis function. To run the self-diagnosis function, do the following:
1. Turn the ignition switch ON (II).
2. Turn the temperature control knob to LO for about 20 seconds, then HI for about 20 seconds.
3. Press the OFF button, then press the recirculation control button to select to Recirculation (recirculation indicator comes on).
4. Press and hold the recirculation control button to select Fresh (recirculation indicator goes off). Continue to hold the button. The recirculation indicator comes on for 2 seconds, and then goes off.
- If the system is OK, the recirculation indicator stays off.
- If any trouble is found, the recirculation indicator blinks the diagnostic trouble code (DTC) to indicate a faulty circuit or component.
5. After recording the DTC, release the recirculation control button.
To determine the meaning of the DTC, refer to the DTC troubleshooting index for rear heater-A/C control system. DTC List - Rear Heater-A/C Control System
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.
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 knob to the desired test temperature. When selecting the test temperatures, note these items:
- 60 °F temperature setting will default to MAX COOL, VENT, and RECIRC.
- 90 °F temperature setting will default to MAX HOT, FLOOR, and FRESH.
- 61 ° through 89 °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. Press and hold both the AUTO and RECIRC buttons, then start the engine.
2. After the engine starts, release the buttons. The climate control display will flash the sensor number and then the value for that sensor. Record the valve displayed.
NOTE:
- The sensor values will be displayed in degrees Celsius (°C) or an alphanumeric code. Use the chat 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. Run the self-diagnosis function to check for a DTC.
- If necessary, compare the sensor input display in alike, known-good vehicle under the same test conditions.
- If the sensor is out of the normal range, substitute the sensor with a known-good, and recheck.
3. To advance to the next sensor, press the rear window defogger button.
4. To cancel the sensor input display mode, press the AUTO button, or turn the ignition off.
Celsius To Fahrenheit Conversion Table:
Celsius to Fahrenheit Conversion Table
Celsius To Fahrenheit Conversion Table:
Celsius to Fahrenheit Conversion Table
Alphanumeric Conversion Table:
Alphanumeric Conversion Table