How to Troubleshoot the Climate Control System 2188 Page 1 of 6
How to Troubleshoot the Climate Control System
How to Check for DTCs With the HDS
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.
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. If no DTCs are indicated, do all system scan, then refer to symptom
troubleshooting.
NOTE:
After troubleshooting, clear the DTCs with the HDS.
For specific operations, refer to the user's manual that came with the HDS.
How to Use the Self-Diagnostic Function With the HDS
1. Make sure the ignition switch is in LOCK (0).
2. Connect the HDS to the DLC.
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.
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How to Troubleshoot the Climate Control System 2188 Page 2 of 6
5. Select HVAC/CLIMATE CONTROL in the BODY ELECTRICAL menu.
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How to Troubleshoot the Climate Control System 2188 Page 3 of 6
6. Select INSPECTION in the HVAC/CLIMATE CONTROL menu.
7. Select CLIMATE CONTROL SELF TEST in the INSPECTION menu.
8. Check for DTCs. If any DTCs are indicated, write down the DTCs, then go to the indicated
DTC troubleshooting.
NOTE:
After troubleshooting, clear the DTCs with the HDS.
For specific operations, refer to the user's manual that came with the HDS.
How to Use the Self-Diagnostic Function Without the HDS
The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the
following:
1. Turn the ignition switch to LOCK (0), and then back to ON (II).
2. 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.
3. All LCD segments come on for 2 seconds, then the self-diagnostic function begins.
NOTE:
The blower motor will run at various speeds regardless of what the panel is displaying.
If there is any problem in the system, the system flashes 88 or alternately flashes 88.
Refer to checking for DTCs.
If there are no problems detected, the segments will not illuminate, and the system will
appear to be turned off.
AUTO BUTTON TEMPERATURE INDICATOR FAN CONTROL BUTTON
AUTO INDICATOR
ON/OFF BUTTON
A/C BUTTON
RECIRCULATION REAR WINDOW DEFOGGER/
CONTROL BUTTON MIRROR DEFOGGER BUTTON
Canceling the Self-Diagnostic Function
4. Turn the ignition switch to LOCK (0) to cancel the self-diagnostic function. After completing
repair work, run the self-diagnostic function again to make sure that there are no other DTCs.
Checking for DTCs
The temperature display indicates single or multiple DTCs. If no DTCs are present, the indicator
remains blank.
NOTE: If temperature indicator segments 05, 07, 09, 0F, and 89 are on at the some time, there
may be an open in the sensor common ground wire.
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How to Troubleshoot the Climate Control System 2188 Page 4 of 6
TEMPERATURE INDICATOR
DTC (Temperature Detection Item
Indicator Segments)
05 An open in the outside air temperature sensor circuit
06 A short in the outside air temperature sensor circuit
07 An open in the sunlight sensor circuit
08 A short in the sunlight sensor circuit
09 An open in the evaporator temperature sensor circuit
0A A short in the evaporator temperature sensor circuit
0F An open in the heater core temperature sensor circuit
10 A short in the heater core temperature sensor circuit
40 An open in the air mix control motor circuit
41 A short in the air mix control motor circuit
42 A problem in the air mix control motor circuit, linkage, door, or motor
49 An open in the mode control motor circuit
4A A short in the mode control motor circuit
4B A problem in the mode control motor circuit, linkage, doors, or motor
55 An open in the recirculation control motor circuit
56 A short in the recirculation control motor circuit
57 A problem in the recirculation control motor circuit, linkage, door, or motor
59 A problem in the blower motor circuit
5D A problem in the auxiliary electric water pump circuit
80 Communication bus line error (BUS-OFF)
81 Climate control unit lost communication with gauge control module (ECT message)
83 Climate control unit lost communication with gauge control module (VSP message)
89 Humidity/in-car temperature sensor communication error
C0 Climate control unit internal error
C1 An open in the thermal protector circuit
C2 A short in the thermal protector circuit
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
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 switch to the desired test temperature:
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How to Troubleshoot the Climate Control System 2188 Page 5 of 6
‘‘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, and FRESH.
USA models: 57 through 87 °F (14 through 30 °C) settings will use the automatic climate
control logic.
Except USA models: 15 through 29 °C (59 through 84 °F) settings will use the automatic
climate control logic.
3. Turn the ignition switch to LOCK (0).
Run the Sensor Input Display Mode
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 climate 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 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 sensor test or substitute a known-good sensor, and recheck.
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 10 kcal/m2·h
5 Evaporator outlet air temperature °C
6 Air mix opening (low value indicates cooler air distribution, higher value % of opening
indicates warmer air distribution)
7 Recirculation control opening % of opening
8 Vehicle speed (vehicle must be driven to display speed) 10 km/h
9 Engine coolant temperature °C
A Vent temperature air out (TAO) °C
b Humidity sensor value %
C Heater core temperature °C
d A/C compressor revolution feedback 100 rpm
E Software version ---
Celsius to Fahrenheit Conversion Table
°C °F °C °F °C °F °C °F °C °F
0 32 10 50 20 68 30 86 40 104
1 34 11 52 21 70 31 88 41 106
2 36 12 54 22 72 32 90 42 108
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°C °F °C °F °C °F °C °F °C °F
3 37 13 55 23 73 33 91 43 109
4 39 14 57 24 75 34 93 44 111
5 41 15 59 25 77 35 95 45 113
6 43 16 61 26 79 36 97 46 115
7 45 17 63 27 81 37 99 47 117
8 46 18 64 28 82 38 100 48 118
9 48 19 66 29 84 39 102 49 120
°C °F °C °F °C °F °C °F °C °F
50 122 60 140 70 158 80 176 90 194
51 124 61 142 71 160 81 178 91 196
52 126 62 144 72 162 82 180 92 198
53 127 63 145 73 163 83 181 93 199
54 128 64 147 74 165 84 183 94 201
55 131 65 149 75 167 85 185 95 203
56 133 66 151 76 169 86 187 96 205
57 135 67 152 77 170 87 188 97 207
58 136 68 154 78 172 88 190 98 208
59 139 69 158 79 174 89 192 99 210
Alphanumeric Conversion Table
Display Reading °C °F %
(Alphanumeric)
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 -58 -40 thru -49
F0 thru F9 -50 thru -59 -58 thru -74 +100 thru +109
Alphanumeric Conversion Table (Mode Positioning)
Display Reading Mode Position
(Alphanumeric)
0 VENT
18 HEAT/VENT-1
33 HEAT/VENT-2
50 HEAT
66 HEAT/DEF-1
80 HEAT/DEF-2
F0 DEF
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