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
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 OFF.
2.
Press and hold the AUTO and recirculation buttons, and turn the ignition switch ON (II).
3.
ALL LCD segments turn on for 2 seconds, then self-diagnostic function begins.
NOTE:
The blower motor will run at any speed regardless of what the panel is displaying.
If there is any problem in the system, the temperature indicator will light up the segment (A through P) and AUTO indicator 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 P) and AUTO indicator. To determine the meaning of the DTC, 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.
Clear the DTCs
1.
Turn the ignition switch OFF.
2.
Press and hold the AUTO and windshield defrost buttons, turn the ignition switch ON (II).
3.
Windshield defrost indicator blinks for 5 seconds, then DTCs clear.
Checking for DTCs
The temperature display indicates single or multiple DTCs. If indicator segments A, C, E, G, J, M, and AUTO are on at the same time, there may be an open in the common ground wire. If no DTCs are present, the indicator remains blank.
DTC (Temperature Indicator Segment and AUTO Indicator)
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 temperature, 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.
19 through 31 °C 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 MODE buttons, then start the engine.
3.
After the engine starts, release both 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 A/C button.
Sensor
Item
Displayed Value
1
Mode Positioning
BIT
2
In-car Temperature
°C
3
Outside Air Temperature
°C
4
Solar Radiation Sensor Value: Dark = 00, Flashlight = 04, Cloudy =10, Sunny =65
10 kcal/m2·h
5
Evaporator Outlet Air Temperature
°C
6
Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution)
% of opening
7
Recirculation Opening
% of opening
8
Vehicle Speed (Vehicle must be driven to display speed)
km/h
9
Engine Coolant Temperature
°C
A
Vent Temperature Air Out (TAO)
°C
NOTE:
The sensor values will be displayed in degrees Celsius (°C) 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 a known-good sensor, and recheck.
5.
To cancel the sensor input display mode, press the AUTO button or turn the ignition switch OFF.