How to Troubleshoot the Climate Control System
How to Retrieve a DTC
NOTE: LHD type is shown, RHD type is symmetrical.
The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the following:
|1.||Set the temperature control button to Max Cool (Lo) with the ignition switch ON (II).|
|2.||Press and hold the OFF button. While holding the OFF button, press the rear window defogger button five times within 10 seconds. Release the OFF button and the self-diagnostic will begin.|
NOTE: The blower motor can be run at any speed regardless of what the panel is displaying.
If there are no problems detected, the segments will not illuminate.
Canceling the Self-diagnostic Function
|3.||Turn the ignition switch OFF to cancel the self-diagnosis function. After completing repair work, run the self-diagnostic function again to make sure that there are no other malfunctions.|
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 and L come on 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.
Check these items before using the sensor input 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:|
|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 recirculation buttons, then start the engine.|
|3.||After the engine starts, release the buttons. The display panel control unit 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.|
|5.||To cancel the sensor input display mode, press the AUTO button, or turn the ignition off.|