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.

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:

With Navigation System:

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