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How to Troubleshoot the Climate Control System
How to Check for DTCs with the HDS
NOTE:
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There are three methods used to check for DTCs. The recommended method is to use the Honda Diagnostic System (HDS) with the appropriate software, plugged into the data link connector (DLC). |
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The second method is to run the self-diagnostic function built into the climate control unit. |
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1. |
Make sure the vehicle ignition is in the OFF (LOCK) mode. |
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2. |
Connect the HDS to the DLC (A) located under the driver's side of the dashboard. |
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3. |
Turn the vehicle to the ON mode. |
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5. |
Select BODY ELECTRICAL in the System Selection Menu. |
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6. |
Select HVAC/Climate control in the Body Electrical System Select. |
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7. |
Select DTCs in the HVAC/Climate Control Mode Menu. |
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8. |
Check for DTCs. If any DTCs are indicated, write down the DTCs, then go to the indicated DTC troubleshooting. If no DTCs are indicated, do all system scan, then refer to symptom troubleshooting.
NOTE:
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After troubleshooting, clear the DTCs with the HDS. |
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For specific operations, refer to the user's manual that came with the HDS. | |
How to Use the Self-Diagnostic Function with the HDS
NOTE: This method is only available if the HDS can communicate with the climate control unit.
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1. |
Make sure the vehicle ignition is in the OFF (LOCK) mode. |
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2. |
Connect the HDS to the DLC. |
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3. |
Turn the vehicle to the ON mode. |
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5. |
Select BODY ELECTRICAL in the System Selection Menu. |
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6. |
Select HVAC/Climate Control in the Body Electrical System Select. |
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7. |
Select Inspection in the HVAC/Climate Control Mode Menu. |
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8. |
Select Climate Control Unit Self Test in the Inspection Menu. |
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9. |
Check for DTCs. If any DTCs are indicated, write down the DTCs, then go to the indicated DTC troubleshooting.
NOTE:
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After troubleshooting, clear the DTCs with the HDS. |
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For specific operations, refer to the user's manual that came with the HDS. | |
How to Use the Self-Diagnostic Function without the HDS
Button
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Button |
Button Name |
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AUTO button |
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ON/OFF button |
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REAR WINDOW DEFOGGER/MIRROR DEFOGGER* button |
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RECIRCULATION button |
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WINDSHIELD DEFROST button | |
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The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the following:
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1. |
Turn the vehicle to the OFF (LOCK) mode and then the ON mode. |
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2. |
Press the ON/OFF button to turn on the climate control system if it is off. |
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3. |
Press and hold the ON/OFF button, then within 10 seconds press and release the REAR WINDOW DEFOGGER/MIRROR DEFOGGER* button five times. Release the ON/OFF button.
*: With mirror defogger |
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4. |
ALL LCD segments come on for 2 seconds, then the self-diagnostic function begins.
NOTE:
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The blower motor will run at various speeds regardless of what the panel is displaying. |
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If there is any problem in the system, the temperature indicator flashes 88. Refer to checking for DTCs. |
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If there is more than one DTC, they are displayed one at a time in sequence followed by a pause (all the display indicator segments illuminate) between the DTCs. |
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If no DTCs are present, the temperature indicator will flash “no”. | |
Canceling the Self-Diagnostic Function
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5. |
Turn the vehicle to the OFF (LOCK) mode to cancel the self-diagnostic function. After completing any repairs, run the self-diagnostic function again to make sure that there are no other DTCs. |
Checking for DTCs
The temperature indicator display indicates single or multiple DTCs. If no DTCs are present, the temperature indicator will flash “no”.
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DTC (Temperature Indicator Segments) |
DTC |
Detection Item |
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01 |
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An open in the in-car temperature sensor circuit |
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02 |
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A short in the in-car temperature sensor circuit |
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05 |
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An open in the outside air temperature sensor circuit |
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06 |
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A short in the outside air temperature sensor circuit |
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09* |
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An open in the evaporator temperature sensor circuit |
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0A* |
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A short in the evaporator temperature sensor circuit |
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17 |
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Automatic lighting control unit/sunlight sensor error |
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40 |
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An open in the air mix control motor circuit |
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41 |
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A short in the air mix control motor circuit |
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42 |
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A problem in the air mix control motor circuit, linkage, door, or motor |
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49 |
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An open in the mode control motor circuit |
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4A |
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A short in the mode control motor circuit |
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4b |
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A problem in the mode control motor circuit, linkage, door, or motor |
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55 |
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An open in the recirculation control motor circuit |
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56 |
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A short in the recirculation control motor circuit |
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57 |
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A problem in the recirculation control motor circuit, linkage, door, or motor |
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59 |
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A problem in the blower motor circuit |
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61* |
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A problem in the A/C compressor variable capacity control solenoid circuit |
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80 |
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Communication bus line error (BUS-OFF) |
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83 |
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Climate control unit lost communication with gauge control module (VSP message) |
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8A |
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Climate control unit LIN communication bus line error |
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91 |
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Climate control unit lost communication with MICU (body control module) |
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93 |
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Climate control unit lost communication with front panel (climate control panel) |
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??? |
Climate control unit internal error |
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??? |
Unknown sunlight sensor type | |
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How to Check for History DTCs
The climate control unit can record history DTCs. To read the history DTCs, do the following:
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1. |
Turn the vehicle to the OFF (LOCK) mode and then the ON mode. |
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2. |
While pressing the WINDSHIELD DEFROST button, press and hold the ON/OFF button for 10 seconds or more. |
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3. |
While pressing and holding both the WINDSHIELD DEFROST and ON/OFF buttons, the history DTCs will be indicated.
NOTE:
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If there is any problem in the system, the temperature indicator flashes 88. Refer to checking for DTCs. |
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If there is more than one DTC, they are displayed one at a time in sequence followed by a pause (all the display indicator segments illuminate) between the DTCs. |
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If no DTCs are present, the temperature indicator will flash “no”. | |
Canceling the Read History DTCs
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4. |
Turn the vehicle to the OFF (LOCK) mode to cancel the history DTCs. After completing the repair work, clear the DTCs. |
How to Clear the History DTCs
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1. |
Turn the vehicle to the OFF (LOCK) mode. |
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2. |
Press and hold both the AUTO and WINDSHIELD DEFROST buttons, then turn the vehicle to the ON mode. |
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3. |
After about 5 seconds the windshield defrost indicator starts to blink, release the buttons. |
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4. |
Do the How to Check for History DTCs to verify DTCs have been cleared. |
Displaying Sensor Inputs at the Climate Control Unit
The climate control unit has a mode that displays the 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.
Checks Before Using the Sensor Input Display Mode
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1. |
Turn the vehicle to the ON mode, and check the recirculation door function; press the RECIRCULATION button to switch from FRESH to RECIRCULATE. The air volume and sound should change slightly. |
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2. |
Set the TEMPERATURE CONTROL dial to the desired test temperature:
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“Lo” temperature setting will default to MAX COOL, VENT, and RECIRCULATE (A/C on) or FRESH (A/C off). |
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“Hi” temperature setting will default to MAX HOT, HEAT, HEAT/DEF and FRESH. | |
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3. |
Turn the vehicle to the OFF (LOCK) mode. |
Run the Sensor Input Display Mode
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1. |
Press and hold both the AUTO and RECIRCULATION buttons, then start the engine. |
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2. |
Release both buttons. The temperature indicator will flash the sensor number and then the value for that sensor. Record the value displayed. |
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3. |
To advance to the next sensor, press the REAR WINDOW DEFOGGER/MIRROR DEFOGGER* button.
*: With mirror defogger |
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4. |
To cancel the sensor input display mode, press the AUTO button or turn the vehicle to the OFF (LOCK) mode.
NOTE:
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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). |
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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 use the climate control self-diagnostic function. |
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If necessary, compare the sensor input display to a known-good vehicle under the same test conditions. |
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If the sensor displayed value is out of the normal range, refer to the sensor test or substitute a known-good sensor, and recheck. |
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Unsupported items shall be skipped. |
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Sensor |
Item |
Displayed Value |
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0 |
In-car temperature sensor |
°C |
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1 |
Outside air temperature sensor |
°C |
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2 |
Sunlight sensor |
10 W/m2·h |
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3 |
Engine coolant temperature |
°C |
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4 |
Evaporator temperature sensor |
°C |
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8 |
Air mix opening (low value indicates cooler air distribution, higher value indicates warmer air distribution) |
% of opening |
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9 |
Passenger's air mix opening (low value indicates cooler air distribution, higher value indicates warmer air distribution) |
% of opening |
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b |
Mode positioning |
0.1 V |
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d |
Recirculation control opening |
% of opening |
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F |
Vehicle speed (vehicle must be driven to display speed) |
10 km/h |
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H |
A/C compressor oil circulation |
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Finished: 1 |
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Unfinished: 0 | |
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L |
Sunlight sensor type |
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Hard Wire: 00 |
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BCAN: 99 |
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Unknown: ?? | |
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o |
Not used |
??? | |
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Celsius to Fahrenheit Conversion Table
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°C |
°F |
°C |
°F |
°C |
°F |
°C |
°F |
°C |
°F |
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0 |
32 |
10 |
50 |
20 |
68 |
30 |
86 |
40 |
104 |
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1 |
34 |
11 |
52 |
21 |
70 |
31 |
88 |
41 |
106 |
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2 |
36 |
12 |
54 |
22 |
72 |
32 |
90 |
42 |
108 |
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3 |
37 |
13 |
55 |
23 |
73 |
33 |
91 |
43 |
109 |
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4 |
39 |
14 |
57 |
24 |
75 |
34 |
93 |
44 |
111 |
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5 |
41 |
15 |
59 |
25 |
77 |
35 |
95 |
45 |
113 |
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6 |
43 |
16 |
61 |
26 |
79 |
36 |
97 |
46 |
115 |
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7 |
45 |
17 |
63 |
27 |
81 |
37 |
99 |
47 |
117 |
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8 |
46 |
18 |
64 |
28 |
82 |
38 |
100 |
48 |
118 |
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9 |
48 |
19 |
66 |
29 |
84 |
39 |
102 |
49 |
120 | |
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°C |
°F |
°C |
°F |
°C |
°F |
°C |
°F |
°C |
°F |
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50 |
122 |
60 |
140 |
70 |
158 |
80 |
176 |
90 |
194 |
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51 |
124 |
61 |
142 |
71 |
160 |
81 |
178 |
91 |
196 |
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52 |
126 |
62 |
144 |
72 |
162 |
82 |
180 |
92 |
198 |
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53 |
127 |
63 |
145 |
73 |
163 |
83 |
181 |
93 |
199 |
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54 |
129 |
64 |
147 |
74 |
165 |
84 |
183 |
94 |
201 |
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55 |
131 |
65 |
149 |
75 |
167 |
85 |
185 |
95 |
203 |
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56 |
133 |
66 |
151 |
76 |
169 |
86 |
187 |
96 |
205 |
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57 |
135 |
67 |
153 |
77 |
171 |
87 |
189 |
97 |
207 |
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58 |
136 |
68 |
154 |
78 |
172 |
88 |
190 |
98 |
208 |
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59 |
138 |
69 |
156 |
79 |
174 |
89 |
192 |
99 |
210 | |
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Alphanumeric Conversion Table
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Display Reading (Alphanumeric) |
°C |
°F |
% |
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0 thru 99 |
0 thru 99 |
32 thru 210 |
0 thru 99 |
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A1 thru A9 |
-1 thru -9 |
30 thru 16 |
-1 thru -10 |
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B0 thru B9 |
-10 thru -19 |
14 thru -2 |
-10 thru -19 |
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C0 thru C9 |
-20 thru -29 |
-4 thru -20 |
-20 thru -29 |
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D0 thru D9 |
-30 thru -39 |
-22 thru -38 |
-30 thru -39 |
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E0 thru E9 |
-40 thru -49 |
-40 thru -56 |
-40 thru -49 |
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F0 thru F8 |
100 thru 108 |
212 thru 226 |
100 thru 108 |
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F9 |
109 thru 200 |
228 thru 392 |
109 thru 200 | |
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Alphanumeric Conversion Table (Mode Positioning)
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Display Reading (Volt) |
Mode Position |
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0.5 |
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1.3
or
1.9 |
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2.6 |
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3.2
or
3.7 |
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4.5 |
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