How to Troubleshoot the Climate Control System (With Climate Control)

How to Troubleshoot the Climate Control System

How to Check for DTCs with the Honda PGM Tester or the HDS

NOTE: Before troubleshooting the climate control system, refer to the multiplex integrated control system test mode A

1.	Make sure the ignition switch is OFF.

2.	Connect the Honda PGM Tester or the HDS (A) to the Data Link Connector (DLC) (B) located under the driver's side of the dashboard. AB

3.	Turn the ignition switch ON (II).

4.	Select DTCs in the climate control mode MENU of the Honda PGM Tester or the HDS.

5.	Check for DTCs. If a DTCs indicated, go to the next step. If no DTC(s) indicated, refer to symptom troubleshooting.

6.	Turn the ignition switch OFF.

7.	Disconnect the Honda PGM Tester or the HDS from the DLC.

8.	Do with the troubleshooting procedure for the DTC indicated.

How to Retrieve a DTC

The audio-HVAC module has a self-diagnosis function for climate control. To run the self-diagnosis function, do the following:

NOTE: Before troubleshooting the climate control system, refer to the multiplex integrated control system test mode A.

1.	Turn the ignition switch ON (II).

2.	Press the AUTO button and then the OFF button. Continue to hold both buttons down for 1 minute. Without Navigation System: TEMPERATURE INDICATOROFF BUTTONAUTO BUTTON With Navigation System: TEMPERATURE INDICATOROFF BUTTONAUTO BUTTON

If there is 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. If no segments light up, but the system is still not operating properly, check the sensor inputs to the climate control unit, or refer to symptom troubleshooting.

Resetting the Self-diagnosis Function

Turn the ignition switch OFF to cancel the self-diagnosis function. After completing repair work, run the self-diagnosis function again to make sure that there are no other malfunctions.

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: ‘‘Lo'' temperature setting will default to MAX COOL, VENT, and RECIRC. ‘‘Hi'' 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 DUAL buttons, then start the engine.

2.

After the engine starts, release the buttons. The front panel display will flash the sensor number and then the value for that sensor. Record the valve displayed. Sensor  Item  Displayed Value  Sensor 1  In-car Temperature Sensor  °C  Sensor 2  Ambient Temperature  °C  Sensor 3  Solar Radiation Sensor Value: Dark = 00, Flashlight = 04, Cloudy =10, Sunny =65  Kcal/m2·h  Sensor 4  Engine coolant Temperature  °C  Sensor 5  Evaporator Outlet Air Temperature  °C  Sensor 6  Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution.)  % of opening  Sensor 7  Passenger's Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution.)  % of opening  Sensor 8  Vehicle Speed (Vehicle must be driven to display speed)  Km/h  Sensor 9  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 Honda PGM Tester or the HDS, or run the self-diagnosis function to check for DTCs. 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, refer to the sensor test, or 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 °C  °F  °C  °F  °C  °F  °C  °F  °C  °F  0  32  10  50  20  68  30  86  40  104  1  34  11  52  21  70  31  88  41  106  2  36  12  54  22  72  32  90  42  108  3  37  13  55  23  73  33  91  43  109  4  39  14  57  24  75  34  93  44  111  5  41  15  59  25  77  35  95  45  113  6  43  16  61  26  79  36  97  46  115  7  45  17  63  27  81  37  99  47  117  8  46  18  64  28  82  38  100  48  118  9  48  19  66  29  84  39  102  49  120  °C  °F  °C  °F  °C  °F  °C  °F  °C  °F  50  122  60  140  70  158  80  176  90  194  51  124  61  142  71  160  81  178  91  196  52  126  62  144  72  162  82  180  92  198  53  127  63  145  73  163  83  181  93  199  54  128  64  147  74  165  84  183  94  201  55  131  65  149  75  167  85  185  95  203  56  133  66  151  76  169  86  187  96  205  57  135  67  152  77  170  87  188  97  207  58  136  68  154  78  172  88  190  98  208  59  139  69  158  79  174  89  192  99  210  Alphanumeric Conversion Table Display Reading (Alphanumeric)  °C  °F  A1 thru A9  -1 thru -9  30 thru 16  B0 thru B9  -10 thru -19    14 thru -2  C0 thru C9  -20 thru -29   -4 thru -20  D0 thru D9  -30 thru -39  -22 thru -38  E0 thru E9  -40 thru -49  -40 thru -58