Climate Control: Diagnosis Honda Odyssey III

Checking DTCs by DTC Indicator

Note. Before troubleshooting the climate control system, refer to B-CAN System Diagnosis Test Mode A Troubleshooting (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

To retrieve the DTC, you must run the self-diagnostic function. In the case of multiple problems, the respective indicator segments will come on. If indicator segments A, C, D, E, F, G, I, L, N and AUTO indicator come on at the same time, there may be an open in the common ground wire.

Scheme 5

Scheme 6

1. Make sure the ignition switch is OFF.
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 ON (II).
4. Select DTCs in the body electrical/climate control mode MENU of the HDS.
5. Check for DTCs. If a DTC is indicated, go to the next step. If no DTC(s) is indicated, refer to «SYMPTOM TROUBLESHOOTING»(ref-220983-S18167159592006022200000) .
6. Turn the ignition switch OFF.
7. Disconnect the HDS from the DLC.
8. Do the troubleshooting procedure for the DTC indicated.

The climate control unit has a communication circuit self-diagnostic function. Perform the following steps to test the communication circuit.

Scheme 7

1. Turn the ignition switch OFF, and then ON (II).
2. At the climate control panel, press and hold the OFF button. While holding the OFF button, press the rear window defogger button five times within 10 seconds. Release the OFF button. All the LEDs and LCD segments should blink three times. If none of the LEDs or LCD segments blink, go to climate control panel power and ground circuit troubleshooting (see «CLIMATE CONTROL PANEL POWER AND GROUND CIRCUIT TROUBLESHOOTING»(ref-220983-S24923434372006022200000) ). If one or more LEDs or LCD segments do not blink, but at least one LED or LCD segment does blink, replace the climate control panel. If all LEDs and LCD segments blink, go to step 3.
3. Turn the ignition switch OFF, and then ON (II).
4. At the rear climate control panel press and hold the OFF button. While holding the OFF button, press the rear Down triangle button five times within 10 seconds. Release the OFF button. All the LCD segments should blink three times. If none of the LCD segments blink, go to rear climate control panel power and ground circuit troubleshooting (see «REAR CONTROL PANEL POWER AND GROUND CIRCUIT TROUBLESHOOTING»(ref-220983-S06545560092006022200000) ). If one or more LCD segments do not blink, but at least one LCD segment does blink, replace the rear climate control panel. If all LCD segments blink, go to step 5.
5. Turn the ignition switch OFF, and then ON (II).
6. At the climate control panel, press and hold the fan Up triangle button and then the OFF button. While holding both buttons, the fan indicator will light the segment A. If there is any problem in the system, the fan indicator will light corresponding segment (B through E). Record any segments that light and go to step 7.
7. Turn the ignition switch OFF, and then ON (II).
8. At the rear climate control panel, press and hold the rear fan Up triangle button and then the OFF button. While holding both buttons, the fan indicator will light the segment A. If there is any problem in the system, the fan indicator will light the corresponding segment (B through E). If no segment other than segment A light in either the climate control panel or the rear climate control panel, communication circuit is OK. If any segment other than segment A light, record the segments and then go to step 9.
9. Refer to the «POSSIBLE CAUSES CHART»(ref-220983-S03206709152006022200000) and perform the appropriate diagnosis for the error indicated by the front and rear fan segments. POSSIBLE CAUSES CHART Front Fan Segment Rear Fan Segment Possible Cause Perform the following tests B, C, D, and/or E Open in IG2 to climate control panel Open in ground to climate control panel Faulty climate control panel Faulty rear climate control panel Climate control panel power and ground circuit troubleshooting (see «CLIMATE CONTROL PANEL POWER AND GROUND CIRCUIT TROUBLESHOOTING»(ref-220983-S24923434372006022200000) ) Replace the climate control panel Replace the rear climate control panel. B, C, D, and/or E Open in IG2 to rear climate control panel Open in ground to rear climate control panel Faulty rear climate control panel Faulty climate control panel Rear climate control panel power and ground circuit troubleshooting (see «REAR CONTROL PANEL POWER AND GROUND CIRCUIT TROUBLESHOOTING»(ref-220983-S06545560092006022200000) ) Replace the rear climate control panel Replace the climate control panel E E Open in IG2 circuit to climate control unit Open in ground circuit to climate control unit Open in communication circuit between climate control unit and all other units Short to ground in communication circuit Faulty climate control unit Climate control panel power and ground circuit troubleshooting (see «CLIMATE CONTROL PANEL POWER AND GROUND CIRCUIT TROUBLESHOOTING»(ref-220983-S24923434372006022200000) ) Climate control communication circuit troubleshooting (see «CLIMATE CONTROL COMMUNICATION CIRCUIT TROUBLESHOOTING»(ref-220983-S12955174492006022200000) ) Replace the climate control unit E B Open in communication circuit to climate control panel and climate control unit Faulty climate control panel Climate control communication circuit troubleshooting (see «CLIMATE CONTROL COMMUNICATION CIRCUIT TROUBLESHOOTING»(ref-220983-S12955174492006022200000) ) Replace the climate control panel C C Open in communication circuit to rear climate control unit and climate control unit Faulty rear climate control unit Climate control communication circuit troubleshooting (see «CLIMATE CONTROL COMMUNICATION CIRCUIT TROUBLESHOOTING»(ref-220983-S12955174492006022200000) ) Replace the rear climate control unit D E Open in communication circuit to rear climate control panel and climate control unit Faulty rear climate control panel Climate control communication circuit troubleshooting (see «CLIMATE CONTROL COMMUNICATION CIRCUIT TROUBLESHOOTING»(ref-220983-S12955174492006022200000) ) Replace the rear climate control panel

The climate control unit has a communication circuit self-diagnostic function. Perform the following steps to test the communication circuit.

Scheme 8

Scheme 9

1. Turn the ignition switch OFF, and then ON (II).
2. At the climate control panel, press and hold the OFF button. While holding the OFF button, press the rear window defogger button five times within 10 seconds. Release the OFF button. All the LEDs and LCD segments should blink three times. If none of the LEDs or LCD segments blink, go to climate control panel power and ground circuit troubleshooting (see «CLIMATE CONTROL PANEL POWER AND GROUND CIRCUIT TROUBLESHOOTING»(ref-220983-S24923434372006022200000) ). If one or more LEDs or LCD segments do not blink, but at least one LED or LCD segment does blink, replace the climate control panel. If all LEDs and LCD segments blink, go to step 3.
3. Turn the ignition switch OFF, and then ON (II).
4. At the rear climate control panel, press and hold the fan Up triangle button and then OFF button. While holding both buttons, the fan indicator will light the segment A. If there is any problem in the system, the fan indicator will light the corresponding segment (B through E). Record any segments that light and go to step 5.
5. Turn the ignition switch OFF, and then ON (II).
6. At the rear climate control panel, set the rear fan control dial OFF. The rear temperature control dial to Max Cool, and the rear control dial to select Vent.
7. Turn the ignition switch ON (II) and then press the rear control button five times within 10 seconds. The rear control indicator will turn off, and then the communication circuit self-diagnostic function will start. The rear control indicator will blink to indicate any problems. If no segment other than segment A lights in the climate control panel and the rear climate control indicator does not blink, the communication circuit is OK. If any segment other than segment A lights, and/or the rear control indicator blinks, record the segments and/or blinks, and then go to step 8.
8. Refer to the «FRONT FAN SEGMENTS AND REAR CONTROL INDICATOR»(ref-220983-S36159938892006022200000) and perform the appropriate diagnosis for the error indicated by the front fan segments and rear control indicator. FRONT FAN SEGMENTS AND REAR CONTROL INDICATOR Front Fan Segment Rear control indicator (number of blinks) Possible Cause Perform the following tests B, C, D, and/or E Open in IG2 to climate control panel Open in ground to climate control panel Faulty climate control panel Faulty rear control panel Climate control panel power and ground circuit troubleshooting (see «CLIMATE CONTROL PANEL POWER AND GROUND CIRCUIT TROUBLESHOOTING»(ref-220983-S24923434372006022200000) ) Replace the climate control panel Replace the rear control panel 1, 2, 3, and/or 4 Open in IG2 to rear control panel Open in ground to rear control panel Faulty rear control panel Faulty climate control panel Rear control panel power and ground circuit troubleshooting (see «REAR CONTROL PANEL POWER AND GROUND CIRCUIT TROUBLESHOOTING»(ref-220983-S06545560092006022200000) ) Replace the rear control panel Replace the climate control panel E 4 Open in IG2 circuit to climate control unit Open in ground circuit to climate control unit Open in communication circuit between climate control unit and all other units Short to ground in communication circuit Faulty climate control unit Climate control panel power and ground circuit troubleshooting (see «CLIMATE CONTROL PANEL POWER AND GROUND CIRCUIT TROUBLESHOOTING»(ref-220983-S24923434372006022200000) ) Climate control communication circuit troubleshooting (see «CLIMATE CONTROL COMMUNICATION CIRCUIT TROUBLESHOOTING»(ref-220983-S12955174492006022200000) ) Replace the climate control unit E 1 Open in communication circuit to climate control panel and climate control unit Faulty climate control panel Climate control communication circuit troubleshooting (see «CLIMATE CONTROL COMMUNICATION CIRCUIT TROUBLESHOOTING»(ref-220983-S12955174492006022200000) ) Replace the climate control panel C 2 Open in communication circuit to rear climate control unit and climate control unit Faulty rear climate control unit Climate control communication circuit troubleshooting (see «CLIMATE CONTROL COMMUNICATION CIRCUIT TROUBLESHOOTING»(ref-220983-S12955174492006022200000) ) Replace the rear climate control unit D 4 Open in communication circuit to rear control panel and climate control unit Faulty rear control panel Climate control communication circuit troubleshooting (see «CLIMATE CONTROL COMMUNICATION CIRCUIT TROUBLESHOOTING»(ref-220983-S12955174492006022200000) ) Replace the rear control panel

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.

DTC Troubleshooting Index

DTC TROUBLESHOOTING INDEX (1 OF 2)

DTC TROUBLESHOOTING INDEX (2 OF 2)

Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING INDEX

DTC

DTC INDEX

Scheme 10

Scheme 11

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic. Is DTC B1225 or A and AUTO indicated? YES - Go to step 4. NO - Intermittent failure, check for loose wires or poor connections on the in-car temperature sensor circuit.
4. Turn the ignition switch OFF.
5. Remove the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR REPLACEMENT»(ref-220983-S39698933552006022200000) ) and test it (see «IN-CAR TEMPERATURE SENSOR TEST»(ref-220983-S10216697172006022200000) ). Does the in-car temperature sensor test OK? YES - Go to step 6. NO - Replace the in-car temperature sensor.
6. Disconnect the climate control unit 30P connector.
7. Check for continuity between the No. 18 terminal of the climate control unit 30P connector and the No. 2 terminal of the in-car temperature sensor 2P connector. Is there continuity? YES - Go to step 8. NO - Repair open in the wire between the climate control unit and the in-car temperature sensor.
8. Check for continuity between the No. 29 terminal of the climate control unit 30P connector and the No. 1 terminal of the in-car temperature sensor 2P connector. Is there continuity? YES - Check for loose wires or poor connections at the climate control unit 30P connector and at the in-car 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. NO - Repair open in the wire between the climate control unit and the in-car temperature sensor.

Scheme 12

Scheme 13

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic. Is DTC B1226 or B and AUTO indicated? YES - Go to step 4. NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Remove the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR REPLACEMENT»(ref-220983-S39698933552006022200000) ) and test it (see «IN-CAR TEMPERATURE SENSOR TEST»(ref-220983-S10216697172006022200000) ). Does the in-car temperature sensor test OK? YES - Go to step 6. NO - Replace the in-car temperature sensor.
6. Disconnect the climate control unit 30P connector.
7. Check for continuity between the No. 18 terminal of the climate control unit 30P connector and body ground. Is there continuity? YES - Repair short to body ground in the wire between the climate control unit and the in-car temperature sensor. NO - Go to step 8.
8. Check for continuity between the No. 18 terminal and the No. 29 terminal of the climate control unit 30P connector. Is there continuity? YES - Repair 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.

Scheme 14

Scheme 15

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic. Is DTC B1227 or C and AUTO indicated? YES - Go to step 4. NO - Intermittent failure, check for loose wires or poor connections on the outside air temperature sensor circuit.
4. Turn the ignition switch OFF.
5. Remove the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT»(ref-220983-S15232022302006022200000) ) and test it (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(ref-220983-S00066794612006022200000) ). Does the outside air temperature sensor test OK? YES - Go to step 6. NO - Replace the outside air temperature sensor.
6. Disconnect the climate control unit 30P connector.
7. Check for continuity between the No. 19 terminal of the climate control unit 30P connector and the No. 2 terminal of the outside air temperature sensor 2P connector. Is there continuity? YES - Go to step 8. NO - Repair open in the wire between the climate control unit and the outside air temperature sensor.
8. Check for continuity between the No. 29 terminal of the climate control unit 30P connector and the No. 1 terminal of the outside air temperature sensor 2P connector. Is there continuity? YES - Check for loose wires or poor connections at the climate control unit 30P 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. NO - Repair open in the wire between the climate control unit and the outside air temperature sensor.

Scheme 16

Scheme 17

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic. Is DTC B1228 or D and AUTO indicated? YES - Go to step 4. NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Remove the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT»(ref-220983-S15232022302006022200000) ) and test it (see «OUTSIDE AIR TEMPERATURE SENSOR TEST»(ref-220983-S00066794612006022200000) ). Does the outside air temperature sensor test OK? YES - Go to step 6. NO - Replace the outside air temperature sensor.
6. Disconnect the climate control unit 30P connector.
7. Check for continuity between the No. 19 terminal of the climate control unit 30P connector and body ground. Is there continuity? YES - Repair short to body ground in the wire between the climate control unit and the outside air temperature sensor. NO - Go to step 8.
8. Check for continuity between the No. 19 terminal and the No. 29 terminal of the climate control unit 30P connector. Is there continuity? YES - Repair 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.

Scheme 18

Scheme 19

Scheme 20

Scheme 21

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic. Is DTC B1229 or E and AUTO indicated? YES - Go to step 4. NO - Intermittent failure, check for loose wires or poor connections on the sunlight sensor circuit.
4. Turn the ignition switch OFF.
5. Test the sunlight sensor (see «SUNLIGHT SENSOR TEST»(ref-220983-S31588526462006022200000) ). Is the sunlight sensor OK? YES - Go to step 6. NO - Replace the sunlight sensor.
6. Disconnect the sunlight sensor 5P connector (with automatic lighting) or 2P connector (without automatic lighting).
7. Disconnect the climate control unit 30P connector.
8. Check for continuity between the No. 20 terminal of the climate control unit 30P connector and the No. 4 terminal of the sunlight sensor 5P connector (with automatic lighting) or the No. 1 terminal of the sunlight sensor 2P connector (without automatic lighting). Is there continuity? YES - Go to step 9. NO - Repair open in the wire between the climate control unit and the sunlight sensor.
9. Check for continuity between the No. 29 terminal of the climate control unit 30P connector and the No. 2 terminal of the sunlight sensor 5P connector (with automatic lighting) or the No. 2 terminal of the sunlight sensor 2P connector (without automatic lighting). Is there continuity? YES - Check for loose wires or poor connections at the climate control unit 30P connector and at the sunlight sensor 5P connector (with automatic lighting) or the sunlight sensor 2P connector (without automatic lighting). 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. NO - Repair open in the wire between the climate control unit and the sunlight sensor.

Scheme 22

Scheme 23

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic. Is DTC B1230 or F and AUTO indicated? YES - Go to step 4. NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Test the sunlight sensor (see «SUNLIGHT SENSOR TEST»(ref-220983-S31588526462006022200000) ). Is the sunlight sensor OK? YES - Go to step 6. NO - Replace the sunlight sensor.
6. Disconnect the sunlight sensor 5P connector (with automatic lighting) or 2P connector (without automatic lighting).
7. Disconnect the climate control unit 30P connector.
8. Check for continuity between the No. 20 terminal of the climate control unit 30P connector and body ground. Is there continuity? YES - Repair short to body ground in the wire between the climate control unit and the sunlight sensor. NO - Go to step 9.
9. Check for continuity between the No. 20 terminal and the No. 29 terminal of climate control unit 30P connector. Is there continuity? YES - Repair short in the wires between the climate control unit and the sunlight sensor. NO - Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

Scheme 24

Scheme 25

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic. Is DTC B1231 or G and AUTO indicated? YES - Go to step 4. NO - Intermittent failure, check for loose wires or poor connections on the evaporator temperature sensor circuit.
4. Turn the ignition switch OFF.
5. Remove the evaporator temperature sensor (see «EVAPORATOR TEMPERATURE SENSOR REPLACEMENT»(ref-220982-S24079729322006022200000) ) and test it (see «EVAPORATOR TEMPERATURE SENSOR TEST»(ref-220982-S15341314262006022200000) ). Does the evaporator temperature sensor test OK? YES - Go to step 6. NO - Replace the evaporator temperature sensor.
6. Disconnect the climate control unit 30P connector.
7. Check for continuity between the No. 21 terminal of the climate control unit 30P connector and the No. 1 terminal of the evaporator temperature sensor 2P connector. Is there continuity? YES - Go to step 8. NO - Repair open in the wire between the climate control unit and the evaporator temperature sensor.
8. Check for continuity between the No. 29 terminal of the climate control unit 30P connector and the No. 2 terminal of the evaporator temperature sensor 2P connector. Is there continuity? YES - Check for loose wire or poor connections at the climate control unit 30P 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. NO - Repair open in the wire between the climate control unit and the evaporator temperature sensor.

Scheme 26

Scheme 27

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic. Is DTC B1232 or H and AUTO indicated? YES - Go to step 4. NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Remove the evaporator temperature sensor (see «EVAPORATOR TEMPERATURE SENSOR REPLACEMENT»(ref-220982-S24079729322006022200000) ) and test it (see «EVAPORATOR TEMPERATURE SENSOR TEST»(ref-220982-S15341314262006022200000) ). Does the evaporator temperature sensor test OK? YES - Go to step 6. NO - Replace the evaporator temperature sensor.
6. Disconnect the climate control unit 30P connector.
7. Check for continuity between the No. 21 terminal of the climate control unit 30P connector and body ground. Is there continuity? YES - Repair short to body ground in the wire between the climate control unit and the evaporator temperature sensor. NO - Go to step 8.
8. Check for continuity between the No. 21 terminal and the No. 29 terminal of the climate control unit 30P connector. Is there continuity? YES - Repair 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.

Scheme 28

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic. Is DTC B1233 or I and AUTO indicated? YES - Go to step 4. NO - Intermittent failure, check for loose wires or poor connections on the driver's air mix control motor circuit.
4. Turn the ignition switch OFF.
5. Test the driver's air mix control motor (see «AIR MIX CONTROL MOTOR TEST»(ref-220982-S30675397032006022200000) ). Is the driver's air mix control motor OK? YES - Go to step 6. NO - Replace the driver's air mix control motor (see «AIR MIX CONTROL MOTOR REPLACEMENT»(ref-220982-S16868165992006022200000) ).
6. Disconnect the driver's air mix control motor 7P connector.
7. Disconnect the climate control unit 30P connector.
8. Check for continuity between the following terminals of the climate control unit 30P connector and the driver's air mix control motor 7P connector. CLIMATE CONTROL UNIT 30P CONNECTOR AND DRIVER'S AIR MIX CONTROL MOTOR 7P CONNECTOR 30P 7P No. 10 No. 1 No. 11 No. 2 No. 22 No. 7 No. 26 No. 3 No. 29 No. 5 Is there continuity? YES - Check for loose wire or poor connections at the climate control unit 30P connector and at the driver's 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. NO - Repair any open in the wire(s) between the climate control unit and the driver's air mix control motor.

Scheme 29

Scheme 30

1. Clear the DTC by turning the ignition switch OFF, and then ON (II).
2. Operate the climate control system in several modes.
3. Check for DTCs using the HDS or self-diagnostic. Is DTC B1234 or J and AUTO indicated? YES - Go to step 4. NO - Intermittent failure.
4. Turn the ignition switch OFF.
5. Test the driver's air mix control motor (see «AIR MIX CONTROL MOTOR TEST»(ref-220982-S30675397032006022200000) ). Is the driver's air mix control motor OK? YES - Go to step 6. NO - Replace the driver's air mix control motor (see «AIR MIX CONTROL MOTOR REPLACEMENT»(ref-220982-S16868165992006022200000) ).
6. Disconnect the driver's air mix control motor 7P connector.
7. Disconnect the climate control unit 30P connector.
8. Check for continuity between body ground and the climate control unit 30P connector terminals No. 10, 11, 22, 26 and 29 individually. Is there continuity? YES - Repair any short to body ground in the wire(s) between the climate control unit and the driver's air mix control motor. NO - Go to step 9.
9. Check for continuity between the terminals of the climate control unit 30P connector as follows. CLIMATE CONTROL UNIT 30P CONNECTOR Terminal To terminals 10 11, 22, 26, 29 11 22, 26, 29 22 26, 29 26 29 Is there continuity between any of the terminals? YES - Repair the short in the wires. NO - Go to step 10.
10. Turn the ignition switch ON (II), and check the same terminals for voltage to body ground. Is there any voltage? YES - Repair any short to power in the wire(s) between the climate control unit and the driver's 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.

A/C Pressure Switch Circuit Troubleshooting

Note. Do not use this troubleshooting procedure if any of the following items are operative; A/C condenser fan, radiator fan, A/C compressor. Refer to the SYMPTOM TROUBLESHOOTING INDEX . Before performing symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 31

Scheme 32

Scheme 33

Scheme 34

1. Check for body DTCs using B-CAN system diagnosis test mode A troubleshooting (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(ref-220996-S18207449512006022200000) ). Are there any DTCs indicated? YES - Do the appropriate troubleshooting for the DTC indicated. NO - Go to step 2.
2. Disconnect the A/C pressure switch 4P connector.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the No. 1 terminal of the A/C pressure switch 4P connector and body ground. Is there 5 V or more? YES - Go to step 5. NO - Repair open in the wire between the relay control module and the A/C pressure switch.
5. Turn the ignition switch OFF.
6. Check for continuity between the No. 1 and No. 4 terminals of the A/C pressure switch. Is there continuity? YES - Go to step 7. NO - Go to step 16 .
7. Reconnect the A/C pressure switch 4P connector.
8. Disconnect climate control unit 30P connector.
9. Turn the ignition switch ON (II).
10. Measure the voltage between the No. 1 terminal of the climate control unit 30P connector and body ground. Is there 5 V or more? YES - Go to step 11. NO - Repair the open in the wire between the climate control unit and the A/C pressure switch.
11. Turn the ignition switch OFF.
12. Measure the evaporator temperature sensor resistance between the No. 21 and No. 30 terminals of the climate control unit 30P connector. Is the resistance less than 24 kohm ? YES - Go to step 13. NO - Test the evaporator temperature sensor (see «EVAPORATOR TEMPERATURE SENSOR TEST»(ref-220982-S15341314262006022200000) ).
13. Reconnect the climate control unit 30P connector.
14. Turn the ignition switch ON (II).
15. Check that blower motor operates at all speeds. Does the blower motor operate at all speeds? YES - Check for loose wires or poor connections at the climate control unit 30P connector and at the A/C pressure switch 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. NO - Repair the problem in the blower motor circuit.
16. Check for proper A/C system pressure. Is the pressure within specifications? YES - Replace the A/C pressure switch. NO - Repair the A/C pressure problem.

Scheme 35

1. Remove the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR REPLACEMENT»(ref-220983-S39698933552006022200000) ).
2. Heat and cool the sensor by holding it in front of the dashboard center vent. Measure the resistance with the system set to Max Cool. Measure the resistance with the system set to Max Hot.
3. Compare the resistance reading between the No. 1 and No. 2 terminals of the in-car temperature sensor with the specifications graph (Scheme 35); the resistance should be within the specifications.
4. If the resistance is not as specified, replace the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR REPLACEMENT»(ref-220983-S39698933552006022200000) ).

Scheme 36

1. Remove the driver's dashboard lower cover (see «DRIVER'S LOWER DASHBOARD SWITCH PANEL REMOVAL/INSTALLATION»(ref-220971-S38201390202006022200000) ).
2. Remove the self-tapping screws and the in-car temperature sensor (A) from the driver's dashboard lower cover (B).
3. Install the sensor in the reverse order of removal. Be sure to connect the air hose securely.

Scheme 37

1. Remove the outside air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT»(ref-220983-S15232022302006022200000) ).
2. Dip the sensor in ice water, and measure the resistance. Then pour warm water on the sensor, and check for a change in resistance.
3. Compare the resistance reading between the No. 1 and No. 2 terminals of the outside air temperature sensor with the specifications graph (Scheme 37); the resistance should be within the specifications.
4. If the resistance is not as specified, replace the out side air temperature sensor (see «OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT»(ref-220983-S15232022302006022200000) ).

Scheme 38

1. Lift the tab (A) to release the lock, then remove the outside air temperature sensor (B) from the back of the front bumper beam. Disconnect the 2P connector (C) from the outside air temperature sensor.
2. Install the sensor in the reverse order of removal.

Scheme 39

1. Remove the sunlight sensor (A) from the dashboard.
2. Turn the ignition switch ON (II). Measure the voltage between the terminals with the (+) probe on the No. 4 (with automatic lighting sensor) or No. 1 (without automatic lighting sensor) terminal and the (-) probe on the No. 2 terminal with the connector connected. NOTE: The voltage readings will not change under the light of a flashlight or a fluorescent lamp. Voltage should be: 3.6-3.7 V or more with the sensor out of direct sunlight. 3.3-3.5 V or less with the sensor in direct sunlight.
3. If the voltage is not as specified, replace the sunlight sensor (see «SUNLIGHT SENSOR REPLACEMENT»(ref-220983-S38980217282006022200000) ).

Scheme 40

1. Remove the sunlight sensor (A) from the dashboard, then disconnect the connector (B). Be careful not to damage the sensor and the dashboard.
2. Install the sensor in the reverse order of removal.

Passenger's Air Mix Control Motor Test

Note. Check for HVAC DTCs.

Scheme 41

1. Disconnect the 7P connector from the passenger's air mix control motor. NOTE: Incorrectly applying power and ground to the passenger's air mix control motor will damage it. Follow the instructions carefully.
2. Connect battery power to the No. 1 terminal of the passenger's air mix control motor, and ground the No. 2 terminal; the passenger's air mix control motor should run, and stop at Max Cool. If it doesn't, reverse the connections; the passenger's air mix control motor should run, and stop at Max Hot. When the passenger's air mix control motor stops running, disconnect battery power immediately.
3. If the passenger's air mix control motor did not run in step 2 , remove it, then check the passenger's air mix control linkage and door for smooth movement. If the linkage and door move smoothly, replace the passenger's air mix control motor (see «PASSENGER'S AIR MIX CONTROL MOTOR REPLACEMENT»(ref-220983-S12365469792006022200000) ). If the linkage or door sticks or binds, repair them as needed. If the passenger's air mix control motor runs smoothly, go to step 4.
4. Measure the resistance between the No. 5 and No. 7 terminals. It should be between 4.2 to 7.8 k ohm.
5. Reconnect the passenger's air mix control motor 7P connector, then turn the ignition switch ON (II).
6. Using the backprobe set, measure the voltage between the No. 3 and No. 7 terminals. Max Cool-about 0.5 V Max Hot-about 3.3 V
7. If either the resistance or voltage readings are not as specified, replace the passenger's air mix control motor (see «PASSENGER'S AIR MIX CONTROL MOTOR TEST»(ref-220983-S35631817382006022200000) ).

Scheme 42

1. Remove the glove box housing (see «LOWER GLOVE BOX REMOVAL/INSTALLATION»(ref-220971-S15686408522006022200000) ).
2. Disconnect the 7P connector (A) from the passenger's air mix control motor. Remove the self-tapping screws and the passenger's air mix control motor (B) from the heater unit.
3. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly engaged with the linkage. After installation, make sure the motor runs smoothly.

Scheme 43

1. Remove the center panel (see «DASHBOARD CENTER PANEL REMOVAL/INSTALLATION»(ref-220971-S07066773752006022200000) ).
2. Remove the self-tapping screws and the climate control panel (A).
3. Install the control panel in the reverse order of removal. After installation, operate the various functions to see whether works properly.
4. Run the self-diagnostic function to confirm that there are no problems in the system (see «GENERAL TROUBLESHOOTING INFORMATION»(ref-220983-S10735436032006022200000) ).

Scheme 44

1. Remove the glove box housing (see «LOWER GLOVE BOX REMOVAL/INSTALLATION»(ref-220971-S15686408522006022200000) ).
2. Disconnect the connector (A) from the climate control unit (B), then remove the self-tapping screws and the climate control unit.
3. Install the unit in the reverse order of removal. After installation, operate the various functions to see whether works properly.
4. Run the self-diagnostic function to confirm that there are no problems in the system (see «GENERAL TROUBLESHOOTING INFORMATION»(ref-220983-S10735436032006022200000) ).