Climate Control System (V6): Other Honda Accord VIII

How To Check For DTCS With The HDS

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).

The second method is to run the self-diagnostic function built into the climate control unit.

The third method is to use the B-CAN system diagnosis test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A )

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1. Make sure the ignition switch is in LOCK (0).
2. Connect the HDS to the DLC (A) located under the driver's side of the dashboard.
3. Turn the ignition switch to ON (II).
4. Make sure the HDS communicates with the vehicle and the climate control unit. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(ref-423675-S13110687632011092800000) ).
5. 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»(ref-423748-S36826057232011092800000) . If no DTCs are indicated, refer to «SYMPTOM TROUBLESHOOTING»(ref-423748-S40245071582011092800000) . NOTE: After troubleshooting, clear the DTCs with the HDS. For specific operations, refer to the user's manual that came with the HDS.

Checking For DTCs

The temperature display indicates single or multiple DTCs. If no DTCs are present, the indicator remains blank.

Note. If indicator segments A, C, D, E, G, K and the AUTO indicator or the A/C ON indicator are on at the same time, there may be an open in the climate control unit ground circuit.

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DTC CHART

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 to 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 driver's climate control switch to the desired test temperature: Press AUTO button on, the LED turns on. '08-09 models; Press DUAL button off, the LED turns off. '10-12 models; Press SYNC button off, the LED turns off. 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 and FRESH. 58 through 86°F (16 through 28°C) settings will use the automatic climate control logic.
3. Turn the ignition switch to LOCK (0).

To Run The Sensor Input Display Mode, Follow These Steps

1. Turn the ignition switch to LOCK (0).
2. Press and hold both the AUTO and RECIRCULATION CONTROL buttons, then start the engine.
3. After the engine starts, release both buttons. The audio-HVAC display 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/MIRROR DEFOGGER button. 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 use the climate control self-diagnostic function. If necessary, compare the sensor input display to a known-good vehicle under the same test conditions. If the sensor is out of the normal range, refer to the appropriate sensor test or substitute a known-good sensor, and recheck. SENSOR VALUES DISPLAY CHART Sensor Item Displayed Value 1 Mode Positioning % 2 In-car Temperature °C 3 Outside Air Temperature °C 4 Solar Radiation Sensor Value: Dark = 00, Flashlight = 04, Cloudy = 10, Sunny = 65 10kcal/m 2 .h 5 Evaporator Outlet Air Temperature °C 6 Driver's Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution) % of opening 7 Passenger's Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution) % of opening 8 Recirculation Control Opening % of opening 9 Vehicle Speed (Vehicle must be driven to display speed) km/h 10 km/h A Engine Coolant Temperature °C b Vent Temperature Air Out (TAO) °C CELSIUS TO FAHRENHEIT CONVERSION CHART °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 CELSIUS TO FAHRENHEIT CONVERSION CHART °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 CHART Display Reading (Alphanumeric) °C °F % A1 thru A9 -1 thru -9 30 thru 16 -1 thru -9 B0 thru B9 -10 thru -19 14 thru -2 -10 thru -19 CO thru C9 -20 thru -29 -4 thru -20 -20 thru -29 DO thru D9 -30 thru -39 -22 thru -38 -30 thru -39 E0 thru E9 -40 thru -49 -40 thru -56 -40 thru -49 F0 thru F9 -50 thru -59 -58 thru -74 + 100 thru +109 ALPHANUMERIC CONVERSION CHART (MODE POSITIONING) Display Reading (Alphanumeric) Mode Position 0 VENT 18 HEAT/VENT-1 33 HEAT/VENT-2 50 HEAT 66 HEAT/DEF-1 80 HEAT/DEF-2 F0 DEF
5. To cancel the sensor input display mode, press the AUTO button or turn the ignition switch to LOCK (0).

Checking The DTCs by HDS

DTC TROUBLESHOOTING CHART

A/C Pressure Sensor

The A/C pressure sensor converts A/C pressure into electrical signals to the ECM/PCM.

VOLTAGE SPECIFICATIONS

The response of the A/C pressure sensor is shown in the graph.

Note. When the refrigerant is below 196 kPa (2.0 kgf/cm 2 , 28 psi) or above 3, 138 kPa (32 kgf/cm 2 , 455 psi), the PCM turns the A/C compressor clutch relay off to protect the A/C compressor. When the refrigerant pressure is above 1, 470 kPa (15.0 kgf/cm 2 , 213 psi), the PCM switches the radiator and A/C condenser fans to high speed.

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i-Dual Zone Climate Control System

This system automatically controls the temperature and the vent mode of the air direction to the driver and passenger's side depending on the angle of the sun and the direction of the vehicle. It calculates information such as date, time, longitude, and latitude from the navigation system, as well as the radiant strength of the sun from the sunlight sensor, to determine the appropriate mode position and temperature to be directed to each side.

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In the event that the navigation system malfunctions, or when driving in areas where the navigation cannot determine the vehicle position {non-coverage areas, tunnels, etc.), the climate control system will operate the same as a vehicle without navigation system.

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TERMINAL DESCRIPTION CHART

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TERMINAL DESCRIPTION CHART

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