Climate Control: Other Honda Insight ZE2 рестайлинг

A/C Service Tips and Precautions

The air conditioning system uses HFC-134a (R-134a) refrigerant and polyalkyleneglycol (PAG) refrigerant oil.

Use only service equipment that is U.L.-listed and is certified to meet the requirements of SAE J2788 to remove R-134a from the air conditioning system.

If accidental system discharge occurs, ventilate the work area before resuming service.

R-134a service equipment or vehicle air conditioning systems should not be pressure tested or leak tested with compressed air.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

1. Always disconnect the negative cable from the 12 volt battery (see «USING THE GR8 BATTERY DIAGNOSTIC STATION»(ref-513168-S03188703672012110700000) ) whenever replacing air conditioning parts.
2. Keep moisture and dirt out of the system. When disconnecting any lines, plug or cap the fittings immediately; do not remove the caps or plugs until just before you reconnect each line.
3. Before connecting any hose or line, apply a few drops of refrigerant oil to the O-ring.
4. When tightening or loosening a fitting, use a second wrench to support the matching fitting.
5. When discharging the system, use an R-134a refrigerant recovery/recycling/charging station; do not release refrigerant into the atmosphere.

How to Check for DTCs with the HDS

Note. 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 HVAC control unit. The third method is to use B-CAN system diagnosis test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 106

1. Make sure the ignition switch to LOCK (0).
2. Connect the HDS to the data link connector (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 doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-513153-S33429882062012110700000) ).
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-513164-S34155221132012110700000) . If no DTCs are indicated, refer to «SYMPTOM TROUBLESHOOTING»(ref-513164-S22562484012012110700000) . 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, J, and the AUTO indicator or the A/C indicator are on at the same time, there may be an open in the climate control unit ground circuit.

Scheme 107

The climate control unit receives sensor inputs and has a mode that displays them. 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

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 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 (A/C ON) or FRESH (A/C OFF). "Hi" temperature setting will default to MAX HOT, HEAT or HEAT/DEF (switches between HEAT, HEAT/DEF according to the outside temperature sensor reading), and FRESH. 58 through 86°F (or 16 through 28°C) settings will use the automatic climate control logic.
3. Turn the ignition switch to LOCK (0).

Scheme 108

1. Turn the ignition switch to LOCK (0).
2. Press and hold both the AUTO and RECIRCULATION 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 REAR WINDOW DEFOGGER/MIRROR HEATER button. NOTE: The mode positioning will be displayed by BIT. Check the mode motor positioning by using the mode motor code information. 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 a like, known-good vehicle under the same test conditions. If the sensor displayed value is out of the normal range, refer to the sensor test or substitute a known-good sensor, and recheck. Target vent temperature air out (TAO) is the value calculated by the climate control unit. It is determined by the conditions of the TEMP DIAL position, the outside air temperature, the in-car temperature, and the solar radiation. 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 10kcal/m 2 -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 Vehicle speed (vehicle must be driven to display speed) 10 km/h 8 Engine coolant temperature °C 9 Target vent temperature air out (TAO) °C A Humidity sensor value % b Illumination duty Step C Software version -- CELSIUS TO FAHRENHEIT CONVERSION TABLE °C °F 0 32 1 34 2 36 3 37 4 39 5 41 6 43 7 45 8 46 9 48 10 50 11 52 12 54 13 55 14 57 15 59 16 61 17 63 18 64 19 66 20 68 21 70 22 72 23 73 24 75 25 77 26 79 27 81 28 82 29 84 30 86 31 88 32 90 33 91 34 93 35 95 36 97 37 99 38 100 39 102 40 104 41 106 42 108 43 109 44 111 45 113 46 115 47 117 48 118 49 120 50 122 51 124 52 126 53 127 54 128 55 131 56 133 57 135 58 136 59 139 60 140 61 142 62 144 63 145 64 147 65 149 66 151 67 152 68 154 69 158 70 158 71 160 72 162 73 163 74 165 75 167 76 169 77 170 78 172 79 174 80 176 81 178 82 180 83 181 84 183 85 185 86 187 87 188 88 190 89 192 90 194 91 196 92 198 93 199 94 201 95 203 96 205 97 207 98 208 99 210 ALPHANUMERIC CONVERSION TABLE 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 C0 thru C9 -20 thru -29 -4 thru -20 -20 thru -29 D0 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 -- -- + 100 thru +109 Mode Motor Code Information Code information on the mode motor is displayed by combining regulated segments. Mode motor code signal 0: Open, 1: Short (GND) Mode position Mode 1 Mode 2 Mode 3 Mode 4 1 0 0 0 OVER VENT 1 0 0 1 VENT 0 0 0 1 VENT-HEAT/VENT 0 0 1 1 HEAT/VENT 0 0 1 0 HEAT/VENT-HEAT 0 1 1 0 HEAT 0 1 0 0 HEAT-HEAT/DEF 1 1 0 0 HEAT-DEF 1 1 1 0 HEAT/DEF-DEF 1 0 1 0 DEF 1 0 1 1 OVER DEF
5. To cancel the sensor input display mode, press the AUTO button or turn the ignition switch to LOCK (0).

Oil Separator

Oil emission from the A/C compressor to the A/C line is reduced by placing the oil separator in the A/C compressor. This results in a thinner oil film inside of the heat exchangers (A/C condenser and evaporator). Air conditioning efficiency is increased without sacrificing engine performance.

Scheme 109

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Scheme 111

Air Conditioning System Control in the ECON ON Mode

At outside temperatures of 73°F (23°C) or higher in the ECON ON Mode, the air conditioning system controls the following functions to reduce power consumption.

Switching to recirculation mode

Compared to outside air intake, the recirculation of air inside the vehicle reduces A/C compressor operation frequency and air volume.

Reduced air volume

Compared to the ECON OFF Mode, fan electric operation is suppressed and power consumption is reduced.

Scheme 112

Conditions that prevent the ECON ON Mode

The air conditioning system does not control ECON ON Mode under the following conditions.

1. When the driver selects MAX HOT or MAX COOL.
2. Outside air temperature is less than 73°F (23°C).
3. When the driver selects A/C OFF mode.
4. When the mode position is not in VENT or HEAT/VENT.
5. Outside air temperature sensor malfunction.
6. Evaporator temperature sensor malfunction.
7. Climate control unit lost communication with gauge control module (VSP/NE message).

Conditions that cancel the ECON ON Mode

The air conditioning system cancels ECON ON Mode under the following condition.

1. When the driver selects MAX HOT or MAX COOL.
2. Outside air temperature is less than 73°F (23°C).
3. When the driver selects A/C OFF mode.
4. When the mode position get in the positions other than VENT and HEAT/VENT.
5. When the driver selects FRESH mode manually.
6. Outside air temperature sensor malfunction.
7. Evaporator temperature sensor malfunction.
8. Climate control unit lost communication with gauge control module (VSP/NE message).

Auto Idle Stop System Control During A/C Use

The climate control unit calculates the duration of the auto idle stop while the vehicle is stopped, based on sensor inputs, considering the passenger's comfort and visibility.

Passenger comfort

The duration of the auto idle stop is the time when the passengers do not feel a sudden change of the in-car temperature and humidity.

Visibility

To avoid windows fogging, the climate control unit disables the auto idle stop when it determines that the windows are likely to be fogged, based on the humidity sensor value and the drive signal input from the wiper. The calculation of the duration of the auto idle stop varies between ECON OFF Mode and ECON ON Mode. In ECON ON Mode, the climate control unit considers only visibility (prevention of window fogging). In ECON OFF Mode, the unit also considers the comfortable environment inside the vehicle. ECON ON Mode can extend the duration of the auto idle stop, which can improve fuel economy.

When the windows get fogged during auto idle stop, the engine restarts when DEF mode is turned on.

If the climate control unit detects a sensor malfunction, or if the PCM detect a problem with the communication line to the climate control unit during A/C use, auto idle stop is disabled, and the IMA indicator comes on to alert the driver of the problem. The climate control unit may disable auto idle stop under other conditions as well. For more information, refer to the IMA SYSTEM article.

How a comfortable in-car environment is determined

In ECON OFF Mode, the climate control unit calculates the upper and lower limits for a comfortable in-car temperature, keeping the A/C stable to avoid abrupt changes. Auto idle stop is disabled when the upper or lower limits are exceeded. In ECON ON Mode, the priority is not the in-car environment; it is in keeping auto idle stop enable as long as possible.

How window fogging is determined

The climate control unit estimates the temperature on the window, based on the outside air temperature, the vehicle speed, and the in-car temperature and humidity, then calculates a threshold for window fogging. According to this threshold, the climate control unit determines that the window is likely to be fogged, or will not fog, then calculates the duration of auto idle stop.

Shortening of the auto idle stop duration

The climate control unit determines that the humidity will rise, based on the humidity sensor value and the drive signal input from the wipers, and shortens the duration of the auto idle stop.

Auto Idle Stop Disable Conditions

The air conditioning system disables auto idle stop under any one of the following conditions. But the climate control unit enables auto idle stop when the blower motor is off.

When the blower fan is in operation, the system applies the following conditions also.

Dual Construction A/C Pipe

The A/C line unit installed between the engine compartment and the evaporator is the dual construction type.

The discharge line (high pressure) is built inside the suction line (low pressure).

This design is effective for lowering refrigerant temperatures in the discharge line, which helps to improve cooling performance.

Scheme 113

A/C Pressure Sensor

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

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

Scheme 114

HDS PGM Fl Data List Information (as it relates to A/C)

The A/C system data that can be monitored to HDS PGM-FI Data List.

Humidity/In-Car Temperature Sensor

The humidity sensor consists of two sensors. One is for humidity detection, and the other is for in-car temperature detection. When the climate control unit receives the signals about the in-car condition from the humidity sensor, and judges that the humidity in the vehicle is very low, the climate control unit reduces the A/C compressor runtime. Engine power loss is kept to a minimum, and fuel economy is increased.

Scheme 115

Humidity/In-Car Temperature Sensor Quality

The capacitance of the humidity sensor changes by the adsorption and the evaporation of moisture. The resistance change of the humidity sensor changes the output voltage.

Scheme 116

Scheme 117

Scheme 118

5P CONNECTOR

Scheme 119

Scheme 120

Note. Check the 12 volt battery condition (see 12 VOLT BATTERY TEST ), and the charging system (see CHARGING SYSTEM INDICATOR CIRCUIT TROUBLESHOOTING ).

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then to ON (II).
3. Do the self-diagnostic function with the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC A indicated? YES -The climate control unit is faulty, replace the climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Intermittent failure, the climate control unit is OK at this time.

Scheme 121

Scheme 122

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1205 or B, and/or B1206 or C, and/or B1207 or D indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the gauge control module and in the climate control unit circuit.
5. Select B-CAN CONTROL UNITS INFORMATION in the BODY ELECTRICAL menu.
6. Select CHECK CONNECTED CONTROL UNITS in the B-CAN CONTROL UNITS INFORMATION menu. Is gauge control module detected? YES -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Go to step 7.
7. Disconnect under-dash fuse/relay box connector Q (16P).
8. Disconnect the gauge control module 32P connector.
9. Check for continuity between under-dash fuse/relay box connector Q (16P) terminal No. 3 and gauge control module 32P connector terminal No. 17. Is there continuity? YES -Go to step 10. NO -Repair an open in the wire between the MICU and the gauge control module.
10. Disconnect the climate control unit 36P connector.
11. Check for continuity between gauge control module 32P connector terminal No. 17 and climate control unit 36P connector terminal No. 6. Is there continuity? YES -Go to the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(ref-513176-S11072381992012110700000) ). NO -Repair an open in the wire between gauge control module and climate control unit.

Scheme 123

Scheme 124

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1225 or A and AUTO indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the in-car temperature sensor circuit.
5. Turn the ignition switch to LOCK (0).
6. Remove the humidity/in-car temperature sensor (see «HUMIDITY/IN-CAR TEMPERATURE SENSOR REPLACEMENT»(ref-513164-S25714641292012110700000) ), and test it (see «HUMIDITY/IN-CAR TEMPERATURE SENSOR TEST»(ref-513164-S37950628392012110700000) ). Is the in-car temperature sensor OK? YES -With the in-car temperature sensor disconnected, go to step 7. NO -Replace the humidity/in-car temperature sensor (see «HUMIDITY/IN-CAR TEMPERATURE SENSOR REPLACEMENT»(ref-513164-S25714641292012110700000) ).
7. Disconnect the climate control unit 36P connector.
8. Check for continuity between climate control unit 36P connector terminal No. 20 and humidity/in-car temperature sensor 4P connector terminal No. 1. Is there continuity? YES -Go to step 9. NO -Repair an open in the wire between the climate control unit and the in-car temperature sensor.
9. Check for continuity between climate control unit 36P connector terminal No. 1 and humidity/in-car temperature sensor 4P connector terminal No. 2. Is there continuity? YES -Check for loose wires or poor connections at the climate control unit 36P connector and at the humidity/in-car temperature sensor 4P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Repair an open in the wire between the climate control unit and the in-car temperature sensor.

Scheme 125

Scheme 126

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1226 or B and AUTO indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the in-car temperature sensor circuit.
5. Turn the ignition switch to LOCK (0).
6. Remove the humidity/in-car temperature sensor (see «HUMIDITY/IN-CAR TEMPERATURE SENSOR REPLACEMENT»(ref-513164-S25714641292012110700000) ), and test it (see «HUMIDITY/IN-CAR TEMPERATURE SENSOR TEST»(ref-513164-S37950628392012110700000) ). Is the in-car temperature sensor OK? YES -With the in-car temperature sensor disconnected, go to step 7. NO -Replace the humidity/in-car temperature sensor (see «HUMIDITY/IN-CAR TEMPERATURE SENSOR REPLACEMENT»(ref-513164-S25714641292012110700000) ).
7. Disconnect the climate control unit 36P connector.
8. Check for continuity between climate control unit 36P connector terminal No. 20 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the climate control unit and the in-car temperature sensor. NO -Go to step 9.
9. Check for continuity between climate control unit 36P connector terminals No. 1 and No. 20. Is there continuity? YES -Repair a short in the wires between the climate control unit and the in-car temperature sensor. NO -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ).

Scheme 127

Scheme 128

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1227 or C and AUTO indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the outside air temperature sensor circuit.
5. Turn the ignition switch to LOCK (0).
6. Remove the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT»(ref-513164-S32468475452012110700000) ), and test it (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(ref-513164-S39628516422012110700000) ). Is the outside air temperature sensor OK? YES -With the outside air temperature sensor disconnected, go to step 7. NO -Replace the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT»(ref-513164-S32468475452012110700000) ).
7. Disconnect the climate control unit 36P connector.
8. Check for continuity between climate control unit 36P connector terminal No. 22 and outside air temperature sensor 2P connector terminal No. 2. Is there continuity? YES -Go to step 9. NO -Repair an open in the wire between the climate control unit and the outside air temperature sensor.
9. Check for continuity between climate control unit 36P connector terminal No. 1 and outside air temperature sensor 2P connector terminal No. 1. Is there continuity? YES -Check for loose wires or poor connections at the climate control unit 36P connector and at the outside air temperature sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Repair an open in the wire between the climate control unit and the outside air temperature sensor.

Scheme 129

Scheme 130

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1228 or D and AUTO indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connection in the outside air temperature sensor circuit.
5. Turn the ignition switch to LOCK (0).
6. Remove the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT»(ref-513164-S32468475452012110700000) ), and test it (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(ref-513164-S39628516422012110700000) ). Is the outside air temperature sensor OK? YES -With the outside air temperature sensor disconnected, go to step 7. NO -Replace the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT»(ref-513164-S32468475452012110700000) ).
7. Disconnect the climate control unit 36P connector.
8. Check for continuity between climate control unit 36P connector terminal No. 22 and body ground. Is there continuity? YES -Repair a short to body ground in the wire between the climate control unit and the outside air temperature sensor. NO -Go to step 9.
9. Check for continuity between climate control unit 36P connector terminals No. 1 and No. 22. Is there continuity? YES -Repair a short in the wires between the climate control unit and the outside air temperature sensor. NO -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ).

Scheme 131

Scheme 132

Scheme 133

Scheme 134

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1229 or E and AUTO indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the sunlight sensor circuit.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the sunlight sensor 2P connector (without automatic lighting) or the sunlight sensor 5P connector (with automatic lighting).
7. Disconnect the climate control unit 36P connector.
8. Check for continuity between climate control unit 36P connector terminal No. 19 and sunlight sensor 2P connector terminal No. 1 (without automatic lighting) or the sunlight sensor 5P connector terminal No. 4 (with automatic lighting). Without automatic lighting With automatic lighting Is there continuity? YES -Go to step 9. NO -Repair an open in the wire between the climate control unit and the sunlight sensor.
9. Check for continuity between climate control unit 36P connector terminal No. 1 and sunlight sensor 2P connector terminal No. 2 (without automatic lighting) or the sunlight sensor 5P connector terminal No. 2 (with automatic lighting). Without automatic lighting With automatic lighting Is there continuity? YES -Go to step 10. NO -Repair an open in the wire between the climate control unit and the sunlight sensor.
10. Reconnect the sunlight sensor 2P connector (without automatic lighting) or the sunlight sensor 5P connector (with automatic lighting).
11. Reconnect the climate control unit 36P connector.
12. Test the sunlight sensor (see «SUNLIGHT SENSOR TEST»(ref-513164-S33545234572012110700000) ). Is the sunlight sensor OK? YES -Check for loose wires or poor connections at the climate control unit 36P connector and at the sunlight sensor connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Replace the sunlight sensor (see «SUNLIGHT SENSOR REPLACEMENT»(ref-513164-S02928550232012110700000) ).

Scheme 135

Scheme 136

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1230 or F and AUTO indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the sunlight sensor circuit.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the sunlight sensor 2P connector.
7. Disconnect the climate control unit 36P connector.
8. Check for continuity between climate control unit 36P connector terminal No. 19 and body ground. Is there continuity? YES -Repair a short to body ground in the wires between the climate control unit and the sunlight sensor. NO -Go to step 9.
9. Check for continuity between climate control unit 36P connector terminals No. 1 and No. 19. Is there continuity? YES -Repair a short in the wires between the climate control unit and the sunlight sensor. NO -Go to step 10.
10. Reconnect the sunlight sensor 2P connector.
11. Reconnect the climate control unit 36P connector.
12. Test the sunlight sensor (see «SUNLIGHT SENSOR TEST»(ref-513164-S33545234572012110700000) ). Is the sunlight sensor OK? YES -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Replace the sunlight sensor (see «SUNLIGHT SENSOR REPLACEMENT»(ref-513164-S02928550232012110700000) ).

Scheme 137

Scheme 138

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1231 or G and AUTO indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the evaporator temperature sensor circuit.
5. Turn the ignition switch to LOCK (0).
6. Remove the evaporator temperature sensor (see «EVAPORATOR CORE REPLACEMENT»(ref-513164-S22273807822012110700000) ), and test it (see «EVAPORATOR TEMPERATURE SENSOR TEST»(ref-513164-S24665919602012110700000) ). Is the evaporator temperature sensor OK? YES -With the evaporator temperature sensor disconnected, go to step 7. NO -Replace the evaporator temperature sensor (see «EVAPORATOR CORE REPLACEMENT»(ref-513164-S22273807822012110700000) ).
7. Disconnect the climate control unit 36P connector.
8. Check for continuity between climate control unit 36P connector terminal No. 23 and evaporator temperature sensor 2P connector terminal No. 1. Is there continuity? YES -Go to step 9. NO -Repair an open in the wire between the climate control unit and the evaporator temperature sensor.
9. Check for continuity between climate control unit 36P connector terminal No. 1 and evaporator temperature sensor 2P connector terminal No. 2. Is there continuity? YES -Check for loose wires or poor connections at the climate control unit 36P connector and at the evaporator temperature sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Repair an open in the wire between the climate control unit and the evaporator temperature sensor.

Scheme 139

Scheme 140

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1232 or H and AUTO indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connection in the evaporator temperature sensor circuit.
5. Turn the ignition switch to LOCK (0).
6. Remove the evaporator temperature sensor (see «EVAPORATOR CORE REPLACEMENT»(ref-513164-S22273807822012110700000) ), and test it (see «EVAPORATOR TEMPERATURE SENSOR TEST»(ref-513164-S24665919602012110700000) ). Is the evaporator temperature sensor OK? YES -With the evaporator temperature sensor disconnected, go to step 7. NO -Replace the evaporator temperature sensor (see «EVAPORATOR CORE REPLACEMENT»(ref-513164-S22273807822012110700000) ).
7. Disconnect the climate control unit 36P connector.
8. Check for continuity between climate control unit 36P connector terminal No. 23 and body ground. Is there continuity? YES -Repair a short to body ground in the wires between the climate control unit and the evaporator temperature sensor. NO -Go to step 9.
9. Check for continuity between climate control unit 36P connector terminals No. 1 and No. 23. Is there continuity? YES -Repair a short in the wires between the climate control unit and the evaporator temperature sensor. NO -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ).

Scheme 141

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1233 or A and A/C indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the air mix control motor circuit.
5. Turn the ignition switch to LOCK (0).
6. Test the air mix control motor (see «AIR MIX CONTROL MOTOR TEST»(ref-513164-S10662401042012110700000) ). Is the air mix control motor OK? YES -Go to step 7. NO -Replace the air mix control motor (see «AIR MIX CONTROL MOTOR REPLACEMENT»(ref-513164-S40315056872012110700000) ).
7. Disconnect the air mix control motor 7P connector.
8. Disconnect the climate control unit 36P connector.
9. Check for continuity between the following terminals of the climate control unit 36P connector and the air mix control motor 7P connector. 36P: 7P: No. 1 No. 5 No. 3 No. 7 No. 5 No. 3 Is there continuity? YES -Check for loose wires or poor connections at the climate control unit 36P connector and at the air mix control motor 7P connector. If the connections are good, substitute a known-good climate control unit and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Repair an open in the wires between the climate control unit and the air mix control motor.

Scheme 142

Scheme 143

Scheme 144

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1234 or B and A/C indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the air mix control motor circuit.
5. Turn the ignition switch to LOCK (0).
6. Test the air mix control motor (see «AIR MIX CONTROL MOTOR TEST»(ref-513164-S10662401042012110700000) ). Is the air mix control motor OK? YES -Go to step 7. NO -Replace the air mix control motor (see «AIR MIX CONTROL MOTOR REPLACEMENT»(ref-513164-S40315056872012110700000) ).
7. Disconnect the air mix control motor 7P connector and humidity/in-car temperature sensor 4P connector.
8. Disconnect the climate control unit 36P connector.
9. Check for continuity between body ground and climate control unit 36P connector terminals No. 3 and No. 5 individually. Is there continuity? YES -Repair a short to body ground in the wires between the climate control unit and the air mix control motor. NO -Go to step 10.
10. Check for continuity between climate control unit 36P connector terminals No. 3 and No. 5. Is there continuity? YES -Repair a short in the wires between the climate control unit and the air mix control motor. NO -Go to step 11.
11. Turn the ignition switch to ON (II).
12. Measure the voltage between body ground and climate control unit 36P connector terminals No. 3 and No. 5 individually. Is there any voltage? YES -Repair a short to power in the wires between the climate control unit and the air mix control motor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit. NO -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ).

Scheme 145

Scheme 146

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1235 or C and A/C indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the air mix control motor circuit.
5. Turn the ignition switch to LOCK (0).
6. Test the air mix control motor (see «AIR MIX CONTROL MOTOR TEST»(ref-513164-S10662401042012110700000) ). Is the air mix control motor OK? YES -Go to step 7. NO -Replace the air mix control motor (see «AIR MIX CONTROL MOTOR REPLACEMENT»(ref-513164-S40315056872012110700000) ), or repair the air mix control linkage or door.
7. Disconnect the air mix control motor 7P connector.
8. Disconnect the climate control unit 36P connector.
9. Check for continuity between the following terminals of the climate control unit 36P connector and the air mix control motor 7P connector. 36P: 7P: No. 12 No. 2 No. 13 No. 1 Is there continuity? YES -Go to step 10. NO -Repair an open in the wires between the climate control unit and the air mix control motor.
10. Check for continuity between body ground and climate control unit 36P connector terminals No. 12 and No. 13 individually. Is there continuity? YES -Repair a short to body ground in the wires between the climate control unit and the air mix control motor. NO -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ).

Scheme 147

Scheme 148

Scheme 149

Scheme 150

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1239 or D and A/C indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the mode control motor circuit.
5. Turn the ignition switch to LOCK (0).
6. Test the mode control motor (see «MODE CONTROL MOTOR TEST»(ref-513164-S30311527122012110700000) ). Is the mode control motor OK? YES -Go to step 7. NO -Replace the mode control motor (see «AIR MIX CONTROL MOTOR REPLACEMENT»(ref-513164-S40315056872012110700000) ).
7. Disconnect the mode control motor 7P connector.
8. Disconnect the climate control unit 36P connector.
9. Check for continuity between the following terminals of the climate control unit 36P connector and the mode control motor 7P connector. 36P: 7P: No. 1 No. 7 No. 27 No. 6 No. 28 No. 5 No. 29 No. 4 No. 30 No. 3 Is there continuity? YES -Go to step 10. NO -Repair an open in the wires between the climate control unit and the mode control motor.
10. Check for continuity between body ground and climate control unit 36P connector terminals No. 27, No. 28, No. 29, and No. 30 individually. Is there continuity? YES -Repair a short to body ground in the wires between the climate control unit and the mode control motor. NO -Go to step 11.
11. Check for continuity between the climate control unit 36P connector terminals as follows. From terminal To terminals 27 28, 29, 30 28 29, 30 29 30 Is there continuity between any of the terminals? YES -Repair a short in the wires. NO -Go to step 12.
12. Turn the ignition switch to ON (II).
13. Measure the voltage between body ground and climate control unit 36P connector terminals No. 27, No. 28, No. 29, and No. 30 individually. Is there any voltage? YES -Repair a short to power in the wires between the climate control unit and the mode control motor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit. NO -Check for loose wires or poor connections at the climate control unit 36P connector and at the mode control motor 7P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ).

Scheme 151

Scheme 152

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1240 or E and A/C indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the mode control motor circuits
5. Turn the ignition switch to LOCK (0).
6. Test the mode control motor (see «MODE CONTROL MOTOR TEST»(ref-513164-S30311527122012110700000) ). Is the mode control motor OK? YES -Go to step 7. NO -Replace the mode control motor (see «AIR MIX CONTROL MOTOR REPLACEMENT»(ref-513164-S40315056872012110700000) ), or repair the mode control linkage or doors.
7. Disconnect the mode control motor 7P connector.
8. Disconnect the climate control unit 36P connector.
9. Check for continuity between the following terminals of the climate control unit 36P connector and the mode control motor 7P connector. 36P: 7P: No. 10 No. 1 No. 11 No. 2 Is there continuity? YES -Go to step 10. NO -Repair an open in the wires between the climate control unit and the mode control motor.
10. Check for continuity between body ground and climate control unit 36P connector terminals No. 10 and No. 11 individually. Is there continuity? YES -Repair a short to body ground in the wires between the climate control unit and the mode control motor. NO -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ).

Scheme 153

Scheme 154

Scheme 155

Scheme 156

Scheme 157

Scheme 158

Scheme 159

Scheme 160

Scheme 161

Scheme 162

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B1241 or F and A/C indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the blower motor circuit.
5. Turn the ignition switch to LOCK (0).
6. Check the No. 10 (7.5 A) and No. 57 (30 A) fuses in the under-dash fuse/relay box. Are the fuses OK? YES -Go to step 7. NO -Replace the fuse(s), and recheck. If fuse(s) blow again, check for a short in the No. 10 (7.5 A) and No. 57 (30 A) fuses circuit.
7. Disconnect the blower motor 2P connector.
8. Turn the ignition switch to ON (II).
9. Measure the voltage between blower motor 2P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 10. NO -Go to step 30 .
10. Turn the ignition switch to LOCK (0).
11. Reconnect the blower motor 2P connector.
12. Connect blower motor 2P connector terminal No. 2 to body ground with a jumper wire.
13. Turn the ignition switch to ON (II). Does the blower motor run? YES -Go to step 14. NO -Replace the blower motor (see «BLOWER UNIT COMPONENT REPLACEMENT»(ref-513164-S00401562152012110700000) ).
14. Turn the ignition switch to LOCK (0).
15. Disconnect the jumper wire.
16. Disconnect the power transistor 4P connector.
17. Check for continuity between power transistor 4P connector terminal No. 2 and body ground. Is there continuity? YES -Go to step 18. NO -Check for an open in the BLK wire between the power transistor and body ground. If the wire is OK, check for poor body ground at G502 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(ref-513190-S04645343722012110700000) ).
18. Connect power transistor 4P connector terminals No. 2 and No. 4 with a jumper wire.
19. Turn the ignition switch to ON (II). Does the blower motor run at high speed? YES -Go to step 20. NO -Repair an open in the BLU wire between the power transistor and the blower motor.
20. Turn the ignition switch to LOCK (0).
21. Disconnect the jumper wire.
22. Disconnect the climate control unit 36P connector.
23. Check for continuity between body ground and climate control unit 36P connector terminals No. 15 and No. 34 individually. Is there continuity? YES -Repair a short to body ground in the wire(s) between the climate control unit and the power transistor. NO -Go to step 24.
24. Check for continuity between the following terminals of the climate control unit 36P connector and the power transistor 4P connector. 36P: 4P: No. 15 No. 3 No. 34 No. 1 Is there continuity? YES -Go to step 25. NO -Repair an open in the wire(s) between the climate control unit and the power transistor.
25. Turn the ignition switch to ON (II).
26. Measure the voltage between body ground and climate control unit 36P connector terminals No. 15 and No. 34 individually. Is there voltage? YES -Repair a short to power in the wire(s). NO -Go to step 27.
27. Turn the ignition switch to LOCK (0).
28. Reconnect the climate control unit 36P connector.
29. Test the power transistor (see «POWER TRANSISTOR TEST»(ref-513164-S31068185202012110700000) ). Is the power transistor OK? YES -Check for loose wires or poor connections at the climate control unit 36P connector and at the power transistor 4P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Replace the power transistor (see «POWER TRANSISTOR TEST»(ref-513164-S31068185202012110700000) ). NOTE: If the power transistor is faulty, check the blower motor for damage. If necessary, replace the blower motor (see «BLOWER UNIT COMPONENT REPLACEMENT»(ref-513164-S00401562152012110700000) ).
30. Turn the ignition switch to LOCK (0).
31. Remove the blower motor relay from the under-dash fuse/relay box, and test it (see «POWER RELAY TEST»(ref-513170-S00592820692012110700000) ). Is the relay OK? YES -Go to step 32. NO -Replace the blower motor relay.
32. Measure the voltage between blower motor relay 4P socket terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 33. NO -Replace the under-dash fuse/relay box. USA models (see «REMOVAL AND INSTALLATION»(ref-513189-S16875978532012110700000) ) Canada models (see «CANADA MODEL»(ref-513189-S10776284102012110700000) )
33. Turn the ignition switch to ON (II).
34. Measure the voltage between blower motor relay 4P socket terminal No. 4 and body ground. Is there battery voltage? YES -Go to step 35. NO -Replace the under-dash fuse/relay box. USA models (see «REMOVAL AND INSTALLATION»(ref-513189-S16875978532012110700000) ) Canada models (see «CANADA MODEL»(ref-513189-S10776284102012110700000) )
35. Turn the ignition switch to LOCK (0).
36. Check for continuity between blower motor relay 4P socket terminal No. 3 and body ground. Is there continuity? YES -Repair an open in the WHT wire between the blower motor relay and the blower motor. NO -Check for an open in the wire between the blower motor relay and body ground. If the wire is OK, check for poor ground at G501 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(ref-513190-S04645343722012110700000) ).

Scheme 163

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B2967 or J and AUTO indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the humidity sensor circuit.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the climate control unit 36P connector.
7. Disconnect the humidity/in-car temperature sensor 4P connector and air mix control motor 7P connector.
8. Check for continuity between the following terminals of the climate control unit 36P connector and the humidity/in-car temperature sensor 4P connector. 36P: 4P: No. 1 No. 2 No. 3 No. 4 No. 24 No. 3 Is there continuity? YES -Go to step 9. NO -Repair an open in the wires between the climate control unit and the humidity sensor.
9. Reconnect the humidity/in-car temperature sensor 4P connector.
10. Reconnect the climate control unit 36P connector.
11. Test the humidity sensor (see «HUMIDITY/IN-CAR TEMPERATURE SENSOR TEST»(ref-513164-S37950628392012110700000) ). Is the humidity sensor OK? YES -Check for loose wires or poor connections at the climate control unit 36P connector and at the humidity/in-car temperature sensor 4P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Replace the humidity/in-car temperature sensor (see «HUMIDITY/IN-CAR TEMPERATURE SENSOR REPLACEMENT»(ref-513164-S25714641292012110700000) ).

Scheme 164

Scheme 165

Scheme 166

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ) or the climate control unit (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-513164-S14410696312012110700000) ).
4. Check for DTCs. Is DTC B2968 or K and AUTO indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the humidity sensor circuit.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the climate control unit 36P connector.
7. Disconnect the humidity/in-car temperature sensor 4P connector and air mix control motor 7P connector.
8. Check for continuity between body ground and climate control unit 36P connector terminals No. 1, No. 3, and No. 24 individually. Is there continuity? YES -Repair a short to body ground in the wires between the climate control unit and the humidity sensor. NO -Go to step 9.
9. Check for continuity between terminals of the climate control unit 36P connector as follows. From terminal To terminals 1 3, 24 3 24 Is there continuity between any of the terminals? YES -Repair a short in the wires. NO -Go to step 10.
10. Turn the ignition switch to ON (II).
11. Measure the voltage between body ground and climate control unit 36P connector terminals No. 1, No. 3, and No. 24 individually. Is there any voltage? YES -Repair a short to power in the wires between the climate control unit and the humidity sensor. This short may also damage the climate control unit. Repair a short to power before replacing the climate control unit. NO -Go to step 12.
12. Reconnect the humidity/in-car temperature sensor 4P connector and air mix control motor 7P connector.
13. Reconnect the climate control unit 36P connector.
14. Test the humidity sensor (see «HUMIDITY/IN-CAR TEMPERATURE SENSOR TEST»(ref-513164-S37950628392012110700000) ). Is the humidity temperature sensor OK? YES -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Replace the humidity/in-car temperature sensor (see «HUMIDITY/IN-CAR TEMPERATURE SENSOR REPLACEMENT»(ref-513164-S25714641292012110700000) ).

Scheme 167

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS»(ref-513164-S17727915372012110700000) ).
4. Check for DTCs. Is DTC B2969 indicated? YES -Go to step 5. NO -Intermittent failure, check for loose wires or poor connections in the gauge control module and climate control unit circuit.
5. Select B-CAN CONTROL UNITS INFORMATION in the BODY ELECTRICAL menu.
6. Select CHECK CONNECTED CONTROL UNITS in the B-CAN CONTROL UNITS INFORMATION menu. Is the gauge control module detected? YES -Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Go to step 7.
7. Disconnect under-dash fuse/relay box connector Q (16P).
8. Disconnect the gauge control module 32P connector.
9. Check for continuity between under-dash fuse/relay box connector Q (16P) terminal No. 3 and the gauge control module 32P connector terminal No. 17. Is there continuity? YES -Go to the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(ref-513176-S11072381992012110700000) ). NO -Repair an open in the wire between the MICU and the gauge control module.

Scheme 168

Scheme 169

Scheme 170

Scheme 171

1. Check the No. 10(7.5 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES -Go to step 2. NO -Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. 10 (7.5 A) fuse circuit.
2. Disconnect the recirculation control motor 7P connector.
3. Turn the ignition switch to ON (II).
4. Measure the voltage between recirculation control motor 7P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 5. NO -Repair an open in the wire between the No. 10 (7.5 A) fuse in the under-dash fuse/relay box and the recirculation control motor.
5. Turn the ignition switch to LOCK (0).
6. Test the recirculation control motor (see «RECIRCULATION CONTROL MOTOR TEST»(ref-513164-S31373776582012110700000) ). Is the recirculation control motor OK? YES -Go to step 7. NO -Replace the recirculation control motor (see «RECIRCULATION CONTROL MOTOR REPLACEMENT»(ref-513164-S36902904862012110700000) ), or repair the recirculation control linkage or door.
7. Disconnect the climate control unit 36P connector.
8. Check for continuity between body ground and climate control unit 36P connector terminals No. 8 and No. 9 individually. Is there continuity? YES -Repair a short to body ground in the wire(s) between the climate control unit and the recirculation control motor. NO -Go to step 9.
9. Turn the ignition switch to ON (II).
10. Measure the voltage between body ground and climate control unit 36P connector terminals No. 8 and No. 9 individually. Is there any voltage? YES -Repair a short to power in the wires between the climate control unit and the recirculation control motor. This short may also damage the climate control unit. Repair a short to power before replacing the climate control unit. NO -Go to step 11.
11. Turn the ignition switch to LOCK (0).
12. Check for continuity between the following terminals of the climate control unit 36P connector and the recirculation control motor 7P connector. 36P: 7P: No. 8 No. 5 No. 9 No. 7 Is there continuity? YES -Check for loose wires or poor connections at the climate control unit 36P connector and at the recirculation control motor 7P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Repair an open in the wire(s) between the climate control unit and the recirculation control motor.

Scheme 172

Scheme 173

Scheme 174

1. Check the No. 10 (7.5 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES -Go to step 2. NO -Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. 10 (7.5 A) fuse circuit.
2. Disconnect the climate control unit 36P and 5P connectors.
3. Turn the ignition switch to ON (II).
4. Measure the voltage between climate control unit 36P connector terminal No. 17 and body ground. Is there battery voltage? YES -Go to step 5. NO -Repair an open in the wire between the No. 10 (7.5 A) fuse in the under-dash fuse/relay box and the climate control unit.
5. Turn the ignition switch to LOCK (0).
6. Check for continuity between body ground and climate control unit 36P connector terminal No. 14 and climate control unit 5P connector terminal No. 3 individually. Is there continuity? YES -Check for loose wires and poor connections at the climate control unit 36P connector. If connections are good, substitute a known-good climate control unit and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-513164-S42194879262012110700000) ). NO -Check for open in the wire between the climate control unit and body ground. If the wire is OK, check for poor ground at G502 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(ref-513190-S04645343722012110700000) ).

Refrigerant Leak Check

Special Tools Required

1. Leak Detector YGK-H-10PM*
2. Leak Detector HLD-100*
3. Leak Detector TIFZX-1*
4. OPTIMAX Jr. A/C Leak Detection Kit TRP124893*

*These tools are available through the Honda Tool and Equipment Program; call 888-424-6857

Note. If accidental system discharge occurs, ventilate the work area before resuming service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers. Check the system for leaks using an R-134a refrigerant leak detector with an accuracy of 14 g (0.5 oz) per year or better

Leak Detector Usage Tips (Refer to the Operator's Manual for complete operating instructions)

1. Position the vehicle in a wind-free work area. This will aid in detecting small leaks.
2. When using the leak detector for the first time, allow it to warm up for 2 minutes with the probe in a clean atmosphere. This lets the temperature sensor in the detector stabilize.
3. The calibration check should be done in the "Search 2" mode. Once that is done, the other check modes do not need calibrating.
4. When leak checking through the HVAC module drain hose, avoid drawing water into the probe. Water can damage the internal pump and sensor.
5. Avoid creasing the flexible probe extension. Creases can restrict air flow and give false readings.
6. Because the detector recalibrates itself for ambient gases, it may be necessary to move the detector away from the leak to clear the sensor. Once the sensor has cleared, recheck the suspected leak.
7. When removing the clear probe tip, be careful not to lose the flow ball.
8. R-134a is heavier than air; always check below and to the sides of all potential leak sources.
9. Halogen leak detectors are sensitive to chemicals: windshield washing solutions, solvents/cleaners, and some vehicle adhesives. Keep these chemicals out of the area when doing leak detection.

Fluorescent Dye Usage Tips

1. Use only Tracer-Stick signal dose fluorescent dye capsules from Tracerline®. Other dyes contain solvents that may contaminate the refrigerant oil, leading to component failure.
2. Adding excessive amounts of dye can damage the A/C compressor.
3. PAG oil is water soluble, so condensation on the evaporator core or the refrigerant lines may wash the PAG oil and fluorescent dye away from the actual leak. Condensation may also carry dye through the HVAC module drain.
4. After checking and repairing leaks, thoroughly clean any residual dye from the areas where leaks were found. Use GLO-AWAY dye cleaner, from Tracerline®, and hot water to remove the dye (follow the instructions on the bottle). Residual dye stains can cause misdiagnosis of any future A/C system leaks.
5. If any refrigerant dye contacts an exterior paint surface, remove it by doing this: Carefully wash the affected surfaces to remove any dirt, and to prevent paint scratching. Mix water and isopropyl alcohol in a 50/50 mixture. Soak a soft 100 % cotton towel with the water/alcohol mixture, and place the cloth on the affected areas to remove the dye. After removing the dye with the water/alcohol-soaked cloth, carefully wash the affected areas, and check that there is no remaining dye.

Scheme 175

1. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) the low-pressure service port (C), as shown, following the equipment manufacturer's instructions.
2. Recover refrigerant from the A/C system (see «REFRIGERANT RECOVERY»(ref-513164-S08783319812012110700000) ), and evacuate the system (see «SYSTEM EVACUATION»(ref-513164-S32602882762012110700000) ). If the system achieves a vacuum of approximately 93.3 kPa (700 mmHg, 27.55 inHg) in 15 minutes, and holds the vacuum for 15 minutes, then the system does not have a leak at this time. If the system cannot achieve or hold a vacuum, continue the refrigerant leak check.
3. Open the high pressure valve to charge the system to the specified capacity. Select the appropriate units of measure for your refrigerant charging station. Refrigerant Capacity: 450 to 500 g 0.45 to 0.50 kg 0.99 to 1.10 lbs 15.8 to 17.6 oz
4. With the engine OFF, use a halogen leak detector first to detect the leak source. Follow a continuous path in order to ensure that you will not miss any possible leaks. Test the following areas of system for leaks: Possible Leak Area Diagnostic Procedure with the Leak Detector Notes Service ports Check the service ports with the detector. If the detector "sniffs" a leak, use fluorescent dye to confirm it. When capping the service ports, ensure that the seals on the port caps are in place, and that the caps are tight. The caps are used as the final seals in the system. A/C condenser If the detector "sniffs" a leak, use fluorescent dye to confirm it. Check for joints or connections coated with oily dust. Check for damaged and corroded areas. Check all fittings, couplings, brazed/welded areas and areas around attachment points. Move the probe slowly (1 inch/second or less), and keep it within 1/4 inch of the component being checked. This maximizes the chance of detecting a leak. If you detected a leak, blow compressed air over the area, then recheck for leaks. For large leaks, clearing the area with compressed air may help you pinpoint the leak source. Evaporator Check at the evaporator drain hose. Check at the passenger's side vent and turn the blower on at low speed. A/C lines (low pressure side) Wiggle the hose when checking crimped metal ends. If the detector "sniffs" a leak, use fluorescent dye to confirm it. Check all fittings, couplings, pressure switches, brazed/welded areas, and areas around attachment points on A/C lines and components. Check for damaged and corroded areas. Move the probe slowly (1 inch/second or less), and keep it within 1/4 inch of the component being checked. This maximizes the chance of detecting a leak.
5. Close the quick coupler valves, then disconnect the quick couplers from the vehicle service ports.
6. Attach the universal connect set, from the Optimax Jr. Leak Detection Kit, to the service valve fitting. Close the control valve (the black knob on the connect set).
7. Attach the charging station low pressure hose quick coupler to the service valve fitting, and open the quick coupler valve. Evacuate the connect set using the charging station vacuum pump, then close the quick coupler valve.
8. Detach the universal connect set, and install a Tracer-Stick® dye capsule between the connect set and the service valve fitting (see the manufacturer's instructions for more detail).
9. Attach the quick coupler on the universal connect set to the low pressure service port on the vehicle. Open the charging station low pressure hose quick coupler valve, but do not open the control valve.
10. Start the engine, and set the A/C system to maximum cooling. Open the control valve to let refrigerant and the dye enter the A/C system through the low pressure service port. Close the control valve when the Tracer-Stick® dye capsule is empty.
11. Run the engine and A/C system for 15 minutes to thoroughly circulate the dye. Then shut the engine off, and inspect the following areas of the system for leaks. NOTE: Check for leaks in a dark work area, and use the UV light and the special glasses from the leak check kit. Other UV lights may not work well with the Tracer-Stick® dye. Small leaks may take up to 1 week of vehicle operation (with normal A/C use) to become visible. Possible Leak Area Diagnostic Procedure with Fluorescent Dye Service ports If a leak is found, replace the Schrader valve on the service port. A/C lines Use a permanent marker pen to circle the leak area. If a leak is found, remove and replace the A/C line (see «A/C LINE REPLACEMENT»(ref-513164-S25127984332012110700000) ). A/C condenser If a leak is found, remove the A/C condenser (see «A/C CONDENSER REPLACEMENT»(ref-513164-S10873802182012110700000) ). Determine whether leak is in the A/C condenser or the receiver/dryer. Use a permanent marker pen to circle the leak area. Replace either the receiver/dryer (see «RECEIVER/DRYER DESICCANT REPLACEMENT»(ref-513164-S25133476572012110700000) ), or the A/C condenser (see «A/C CONDENSER REPLACEMENT»(ref-513164-S10873802182012110700000) ), depending upon which is leaking. A/C compressor Check for leaks at all of the A/C compressor joints, the clutch center, the A/C compressor front housing bolts, and the scroll bolts on the back of the A/C compressor. If a leak is found, use a permanent marker pen to circle the leak area. If the A/C compressor relief valve appears to be leaking, determine whether the leak is coming from the relief valve, or the joint between the A/C compressor casing and the valve. If the leak is from the relief valve, check the A/C system pressures, and refer to the «PRESSURE TEST»(ref-513164-S33350529392012110700000) in the A/C System Test. If the leak is from the casing/valve joint, replace the A/C compressor relief valve (see «A/C COMPRESSOR RELIEF VALVE REPLACEMENT»(ref-513164-S25663542102012110700000) ). If the leak is coming from the suction hose and/or discharge hose fittings on the A/C compressor, clean the A/C fittings and replace the suction/discharge fitting O-rings. For all other A/C compressor leaks, remove and replace the A/C compressor (see «A/C COMPRESSOR REPLACEMENT»(ref-513164-S03727049882012110700000) ). Evaporator Start checking for evaporator leaks by illuminating the evaporator drain tube area. If a leak is found, remove the evaporator core (see «EVAPORATOR CORE REPLACEMENT»(ref-513164-S22273807822012110700000) ). Determine whether leak is from evaporator or expansion valve. Use a permanent marker pen to circle the leak area. Replace the expansion valve (see «EXPANSION VALVE REPLACEMENT»(ref-513164-S08324981972012110700000) ), or the evaporator core (see «EVAPORATOR CORE REPLACEMENT»(ref-513164-S22273807822012110700000) ), depending upon which is leaking.

Refrigerant Recovery

Note. If accidental system discharge occurs, ventilate the work area before resuming service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

Scheme 176

1. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) and the low-pressure service port (C), as shown, following the equipment manufacturer's instructions.
2. Measure the amount of refrigerant oil removed from the A/C system after the recovery process is completed. Be sure to put the same amount of new refrigerant oil back into the A/C system before charging.

System Evacuation

Special Tools Required

Compact Electronic Vacuum Gauge Robinair ROB14777, commercially available

*This tool is available through the Honda Tool and Equipment Program; call 888-424-6857

Note. If accidental system discharge occurs, ventilate the work area before resuming service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers. Do not allow moisture to contaminate the A/C system oil. Moisture in the oil is difficult to remove, and it can damage the A/C compressor. Using a compact electronic vacuum gauge may decrease the required evacuation time because you can measure actual moisture level with this tool.

A more efficient way to measure moisture removal is with a special tool called a compact electronic vacuum gauge, measuring vacuum levels in microns.

Connect the tool according to the manufacturers instructions, and allow the vacuum pump to run until the gauge reads 500 microns.

Shut off and isolate the vacuum pump, then observe the gauge reading

1. If the vacuum level remains stable for at least 3 minutes, all moisture in the system has been removed.
2. A slow increase in the micron reading means there is still moisture boiling out of the system. Restart the vacuum pump and continue evacuating.
3. A quick increase of micron levels indicates a leak is present in the system or your service equipment. Determine the cause and correct the leak before continuing.

Scheme 177

1. When an A/C System has been opened to the atmosphere, such as during installation or repair, it must be evacuated using an R-134a refrigerant recovery/recycling/charging station. If the system has been open for several days, the receiver/dryer should be replaced, refrigerant oil should be drained and replaced with new oil, and the system should be evacuated for several hours.
2. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) and the low-pressure service port (C), as shown, following the equipment manufacturer's instructions.
3. Evacuate the system. The vacuum pump should run for a minimum of 30 minutes to eliminate all moisture from the system. When the suction gauge reads -93.3 kPa (-700 mmHg, -27.55 inHg) for at least 30 minutes, close all valves, and turn off the vacuum pump.
4. If the suction gauge does not reach approximately -93.3 kPa (-700 mmHg, -27.55 inHg) in 15 minutes, there is probably a large leak in the system. Partially charge the system, and check for leaks (see «REFRIGERANT LEAK CHECK»(ref-513164-S30304380392012110700000) ).

System Charging

Note. If accidental system discharge occurs, ventilate the work area before resuming service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

Scheme 178

1. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) and the low-pressure service port (C), as shown, following the equipment manufacturer's instructions.
2. Recover the refrigerant in the A/C system (see «REFRIGERANT RECOVERY»(ref-513164-S08783319812012110700000) ).
3. Evacuate the system (see «SYSTEM EVACUATION»(ref-513164-S32602882762012110700000) ). If the system cannot reach a vacuum of-93.3 kPa (-700 mmHg, -27.55 inHg) in 15 minutes, or cannot hold a vacuum for at least 15 minutes, there is probably a large leak. Do the refrigerant leak check (see «REFRIGERANT LEAK CHECK»(ref-513164-S30304380392012110700000) ), and repair any leaks before charging the system.
4. Add the same amount of new refrigerant oil to the system that was removed during recovery. Use only SP-10 refrigerant oil.
5. Charge the system with the specified amount of R-134a refrigerant. Do not overcharge the system; the A/C compressor will be damaged. Select the appropriate units of measure for your refrigerant charging station. Refrigerant Capacity: 450 to 500 g 0.45 to 0.50 kg 0.99 to 1.10 lbs 15.8 to 17.6 oz
6. Check for refrigerant leaks (see «REFRIGERANT LEAK CHECK»(ref-513164-S30304380392012110700000) ).
7. Check for system performance (see «PERFORMANCE TEST»(ref-513164-S33350529392012110700000) ). SUPPLEMENTAL RESTRAINT SYSTEM (SRS) (If body electrical maintenance is required) The Insight SRS includes a driver's airbag in the steering wheel hub, a front passenger's airbag in the dashboard above the glove box, seat belt tensioners in the front seat belt retractors, side curtain airbags in the sides of the roof, and side airbags in the front seat-backs. Information necessary to safely service the SRS is included in this Service Information. Items marked with an asterisk (*) on the contents information include or are located near SRS components. Servicing, disassembling, or replacing these items requires special precautions and tools, and should be done by an authorized Honda dealer. To avoid rendering the SRS inoperative, which could lead to personal injury or death in the event of a severe frontal or side collision, all SRS service work should be done by an authorized Honda dealer. Improper service procedures, including incorrect removal and installation of the SRS, could lead to personal injury caused by unintentional deployment of the airbags, side airbags, side curtain airbags, and/or seat belt tensioners. Do not bump or impact the SRS unit, front impact sensors, side impact sensors, or rear safing sensor especially when the ignition switch is in ON (II), or for at least 3 minutes after the ignition switch is turned to LOCK (0); otherwise, the system may fail in a collision, or the airbags may deploy. SRS electrical connectors are identified by yellow color coding. Related components are located in the steering column, center console, dashboard, in the dashboard above the glove box, in the front seats, in the roof side, and around the floor. Do not use electrical test equipment on these circuits. INTEGRATED MOTOR ASSIST (IMA) SYSTEM (If body electrical maintenance is required) IMA components are located in this area. The IMA is a high-voltage system. The high voltage cables and their covers are identified by orange coloring. The safety labels are attached to high voltage and other related parts (see «DANGER/WARNING/CAUTION LABEL LOCATIONS»(ref-513149-S16662712122012110700000) ). You must be familiar with the IMA system before working around it. Make sure you have read the Service Precautions in the IMA article before doing repairs or service (see «SERVICE PRECAUTIONS»(ref-513150-S04476901372012110700000) ).