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 procedure
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 ), and the communication circuit self-diagnostic function test.
Scheme 5
- Turn the ignition switch to LOCK (0), and then to ON (II).
- Press and hold the ON/OFF button. While holding the ON/OFF button, press the recirculation button five times within 10 seconds. Release the ON/OFF button, then the self-diagnostic begins. Wait for about one minute for the self-diagnostic to complete. 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 temperature indicator will light up the segment (A through S) corresponding to the error. The temperature indicator will then alternate every second between displaying "88" (all segments lit) and the error code segment (A through S). To determine the meaning of the DTC, refer to checking for DTCs (see «CHECKING FOR DTCS»(ref-336497-S38060543912009072700000) ). If there are no problems detected, the segments will not illuminate, and the system will appear to be turned off.
- 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 malfunctions.
DTC Troubleshooting Index
Checking the DTCs by HDS
| DTC | Detection Item or Symptom | ECU | DTC type | See |
|---|---|---|---|---|
| B1200 | Communication bus line error | Climate control unit | Loss of communication | (see DTC B1050: COMMUNICATION BUS LINE ERROR; DTC B1100: COMMUNICATION BUS LINE ERROR; DTC B1150: COMMUNICATION BUS LINE ERROR; DTC B1200: COMMUNICATION BUS LINE ERROR; DTC B1250: COMMUNICATION BUS LINE ERROR; DTC B1750: COMMUNICATION BUS LINE ERROR ) |
| B1202 | Climate control unit internal error | Climate control unit | Internal error | (see DTC TROUBLESHOOTING ) |
| B1205 | Climate control unit lost communication with gauge control module (VSP/NE message) | Climate control unit | Loss of communication | (see DTC TROUBLESHOOTING ) |
| B1206 | Climate control unit lost communication with gauge control module (ECT message) | Climate control unit | Loss of communication | (see DTC TROUBLESHOOTING ) |
| B1207 | Climate control unit lost communication with gauge control module (ILLUMI message) | Climate control unit | Loss of communication | (see DTC TROUBLESHOOTING ) |
| B1225 | An open in the in-car temperature sensor circuit | Climate control unit | Signal error | (see DTC B1225 OR DTC INDICATOR A: AN OPEN IN THE IN-CAR TEMPERATURE SENSOR CIRCUIT ) |
| B1226 | A short in the in-car temperature sensor circuit | Climate control unit | Signal error | (see DTC B1226 OR DTC INDICATOR B: A SHORT IN THE IN-CAR TEMPERATURE SENSOR CIRCUIT ) |
| B1227 | An open in the outside air temperature sensor circuit | Climate control unit | Signal error | (see DTC B1227 OR DTC INDICATOR C: AN OPEN IN THE OUTSIDE AIR TEMPERATURE SENSOR CIRCUIT ) |
| B1228 | A short in the outside air temperature sensor circuit | Climate control unit | Signal error | (see DTC B1228 OR DTC INDICATOR D: A SHORT IN THE OUTSIDE AIR TEMPERATURE SENSOR CIRCUIT ) |
| B1229 | An open in the sunlight sensor circuit | Climate control unit | Signal error | (see DTC B1229 OR DTC INDICATOR E: AN OPEN IN THE SUNLIGHT SENSOR CIRCUIT ) |
| B1230 | A short in the sunlight sensor circuit | Climate control unit | Signal error | (see DTC B1230 OR DTC INDICATOR F: A SHORT IN THE SUNLIGHT SENSOR CIRCUIT ) |
| B1231 | An open in the evaporator temperature sensor circuit | Climate control unit | Signal error | (see DTC B1231 OR DTC INDICATOR G: AN OPEN IN THE EVAPORATOR TEMPERATURE SENSOR CIRCUIT ) |
| B1232 | A short in the evaporator temperature sensor circuit | Climate control unit | Signal error | (see DTC B1232 OR DTC INDICATOR H: A SHORT IN THE EVAPORATOR TEMPERATURE SENSOR CIRCUIT ) |
| B1233 | An open in the driver's air mix control motor circuit | Climate control unit | Signal error | (see DTC B1233 OR DTC INDICATOR J: AN OPEN IN THE DRIVER'S AIR MIX CONTROL MOTOR CIRCUIT ) |
| B1234 | A short in the driver's air mix control motor circuit | Climate control unit | Signal error | (see DTC B1234 OR DTC INDICATOR K: A SHORT IN THE DRIVER'S AIR MIX CONTROL MOTOR CIRCUIT ) |
| B1235 | A problem in the driver's air mix control linkage, door, or motor | Climate control unit | Signal error | (see DTC B1235 OR DTC INDICATOR L: A PROBLEM IN THE DRIVER'S AIR MIX CONTROL LINKAGE, DOOR, OR MOTOR ) |
| B1236 | An open in the passenger's air mix control motor circuit | Climate control unit | Signal error | (see DTC B1236 OR DTC INDICATOR M: AN OPEN IN THE PASSENGER'S AIR MIX CONTROL MOTOR CIRCUIT ) |
| B1237 | A short in the passenger's air mix control motor circuit | Climate control unit | Signal error | (see DTC B1237 OR DTC INDICATOR N: A SHORT IN THE PASSENGER'S AIR MIX CONTROL MOTOR CIRCUIT ) |
| B1238 | A problem in the passenger's air mix control linkage, door, or motor | Climate control unit | Signal error | (see DTC B1238 OR DTC INDICATOR P: A PROBLEM IN THE PASSENGER'S AIR MIX CONTROL LINKAGE, DOOR, OR MOTOR ) |
| B1239 | An open or short in the mode control motor circuit | Climate control unit | Signal error | (see DTC B1239 OR DTC INDICATOR Q: AN OPEN OR SHORT IN THE MODE CONTROL MOTOR CIRCUIT ) |
| B1240 | A problem in the mode control linkage, doors, or motor | Climate control unit | Signal error | (see DTC B1240 OR DTC INDICATOR R: A PROBLEM IN THE MODE CONTROL LINKAGE, DOORS, OR MOTOR ) |
| B1241 | A problem in the blower motor circuit | Climate control unit | Signal error | (see DTC B1241 OR DTC INDICATOR S: A PROBLEM IN THE BLOWER MOTOR CIRCUIT ) |
TROUBLESHOOTING CHART
Symptom Troubleshooting Index
| Symptom | Diagnostic procedure | Also check for |
|---|---|---|
| The blower and heater controls and the A/C system do not work | Probable cause: Climate control unit malfunction Do the Climate Control Power and Ground Circuit Troubleshooting (see CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING ) | HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Blown fuse No. 30 (10 A) in the under-dash fuse/relay box Faulty blower motor relay Poor ground at G402 (see DASHBOARD WIRE HARNESS (RIGHT BRANCH) ) Poor or loose connections at the terminals |
| The A/C compressor clutch and the A/C condenser/radiator fans are inoperative, but the blower and heater controls work | Probable cause: A/C pressure switch circuit malfunction Do the A/C Pressure Switch Circuit Troubleshooting (see A/C PRESSURE SWITCH CIRCUIT TROUBLESHOOTING ) | HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Body DTCs in B-CAN system (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ) Poor or loose connections at the terminals |
| The A/C compressor clutch does not engage, but the A/C condenser/radiator fans operate, and the blower and heater controls work | Probable cause: No power to the A/C compressor clutch Do the A/C Compressor Clutch Circuit Troubleshooting (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING ) | HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Blown fuse No. 12 (7.5 A) in the under-hood fuse/relay box Poor or loose connections at the terminals |
| Voice commands do not work | Probable cause: Communication problem between the climate control unit and the navigation system Do the Navigation Communication Line Circuit Troubleshooting (see NAVIGATION COMMUNICATION LINE CIRCUIT TROUBLESHOOTING ) | HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Poor or loose connections at the terminals |
| Driver's and passenger's side vent temperatures vary by more than 20 °F (11 °C) | Probable causes: The recirculation control door or an air mix door is malfunctioning Do the following troubleshooting: Recirculation Control Motor Circuit Troubleshooting (see RECIRCULATION CONTROL MOTOR CIRCUIT TROUBLESHOOTING ) Driver's Air Mix Control Motor Test (see DRIVER'S AIR MIX CONTROL MOTOR TEST ) Passenger's Air Mix Control Motor Test (see PASSENGER'S AIR MIX CONTROL MOTOR TEST ) | HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Poor or loose connections at the terminals |
| Blower fan runs slower than expected in cold weather (when in AUTO mode) NOTE: It is normal for the blower fan to run slowly until the coolant temperature rises when in AUTO mode. | Probable cause: Engine coolant temperature (ECT) circuit malfunction Troubleshoot the ECT sensor circuit: ECT sensor 2 circuit low voltage (see DTC P2184: ECT SENSOR 2 CIRCUIT LOW VOLTAGE ) ECT sensor 2 circuit high voltage (see DTC P2185: ECT SENSOR 2 CIRCUIT HIGH VOLTAGE ) | HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Blower motor operation |
| Insufficient heating | Check the coolant level (see COOLANT CHECK ) Check the radiator cap (see RADIATOR CAP TEST ) Check the coolant temperature during normal operation Check the heater core inlet hose temperature: If it is COLD, check for restrictions in the hose, a damaged or leaking thermostat, or a damaged or leaking water pump If it is HOT, check for restrictions in the heater core. Back flush or replace the heater core Do the Driver's Air Mix Control Motor Test (see DRIVER'S AIR MIX CONTROL MOTOR TEST ) and Passenger's Air Mix Control Motor Test (see PASSENGER'S AIR MIX CONTROL MOTOR TEST ) Check the blower motor unit for obstructions Check for air leaks around the ducts and vents | HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION ) Damaged cylinder head gasket |
| NOTE: For symptoms not described here, refer to the Heating/Air Conditioning Troubleshooting Index. | ||
| NOTE |
|---|
| It is normal for the blower fan to run slowly until the coolant temperature rises when in AUTO mode. |
TROUBLESHOOTING CHART
A/C Pressure Switch Circuit Troubleshooting
Note. Do not use this troubleshooting procedure if any of the following items are operative: The A/C condenser fan, the radiator fan, or the A/C compressor. Refer to the SYMPTOM TROUBLESHOOTING INDEX . Before doing any symptom troubleshooting, check for powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ). If the blower motor does not run at all speeds, the A/C compressor will be inoperative. Before performing any other troubleshooting, repair the cause of the inoperative blower motor.
Scheme 6
Scheme 7
Scheme 8
Scheme 9
Scheme 10
Scheme 11
- Check for body DTCs using B-CAN system diagnosis test mode A troubleshooting (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A»(ref-336494-S14750832832009072700000) ). Are there any DTCs indicated? YES -Do the appropriate troubleshooting for the DTC indicated. • NO -Go to step 2.
- Refer to the PGM-FI ECU Data List. Is the A/C switch off? YES - Go to step 3. NO - Refer to the «SYMPTOM TROUBLESHOOTING INDEX»(ref-336497-S04675138292009072700000) .
- Disconnect the A/C pressure switch 4P connector.
- Turn the ignition switch to ON (II).
- Measure the voltage between A/C pressure switch 4P connector terminal No. 4 and body ground. Is there battery voltage? YES -Go to step 6. NO -Go to step 20
- Connect the A/C pressure switch 4P connector terminal No. 4 to body ground with a jumper wire.
- Start the engine. Do the A/C compressor and fans come on? YES -Go to step 8. NO -Check for loose wires or poor connections at under-hood fuse/relay box connector H (18P). If the connections are good, replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(ref-336492-S05232778502009072700000) ).
- Turn the ignition switch to LOCK (0), then disconnect the jumper wire.
- Check for continuity between A/C pressure switch terminals No. 1 and No. 4. Is there continuity? YES -Go to step 10. NO -Go to step 19
- Reconnect the A/C pressure switch 4P connector.
- Disconnect the climate control unit 30P connector.
- Turn the ignition switch to ON (II).
- Measure the voltage between climate control unit 30P connector terminal No. 29 and body ground. Is there battery voltage? YES -Go to step 14. NO -Repair open in the wire between the climate control unit and the A/C pressure switch.
- Turn the ignition switch to LOCK (0).
- Measure the evaporator temperature sensor resistance between climate control unit 30P connector terminals No. 7 and No. 22. Is the resistance less than 24 kohms? YES -Go to step 16. NO -Test the evaporator temperature sensor (see «EVAPORATOR TEMPERATURE SENSOR TEST»(ref-336464-S26005282882009072700000) ).
- Reconnect the climate control unit 30P connector.
- Turn the ignition switch to ON (II).
- 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 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 (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-336497-S28074121282009072700000) ). • NO -Repair the problem in the blower motor circuit.
- Check for proper A/C system pressure. Is the pressure within specifications? YES -Replace the A/C pressure switch. • NO -Troubleshoot the A/C pressure problem (see «A/C SYSTEM TEST»(ref-336464-S21158920082009072700000) ).
- Disconnect under-hood relay box connector H (18P).
- Check for continuity between A/C pressure switch connector terminal No. 4 and under-hood relay box connector H (18P) terminal No. 3. Is there continuity? YES -Check for loose wires or poor connections at under-hood fuse/relay box connector H (18P) and A/C pressure switch 4P connector. If the connections are good, replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(ref-336492-S05232778502009072700000) ). • NO -Repair open in the wire between the relay control module and the A/C pressure switch.
Scheme 12
Scheme 13
- Disconnect navigation unit connector A (32P).
- Disconnect the climate control unit 30P connector.
- Check for continuity between the following terminals of the climate control unit 30P connector and navigation unit connector A (32P). 30 Pin Connector Terminal No. 32 Pin Connector Terminal No. 24 4 25 21 26 20 Is there continuity? YES -Go to step 4. NO -Repair open in the wire(s) between the climate control unit and the navigation unit.
- Check for continuity between body ground and climate control unit 30P connector terminals No. 24, 25, and 26 individually. Is there continuity? YES -Repair short to body ground in the wire(s) between the climate control unit and the navigation unit. • NO -Check for loose wires or poor connections at the climate control unit 30P connector and the navigation unit connector A (32P). If the connections are good, substitute a known-good climate control unit and/or navigation unit, and recheck. If the symptom/indication goes away, replace the original climate control unit (see «CLIMATE CONTROL UNIT REMOVAL/INSTALLATION»(ref-336497-S28074121282009072700000) ) and/or navigation unit (see «NAVIGATION UNIT REMOVAL/INSTALLATION»(ref-336516-S39814549562009072700000) ).
In-Car Temperature Sensor Test
Note. Before testing the sensor, check for climate control DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
Scheme 14
- Remove the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR REPLACEMENT»(ref-336497-S28537655172009072700000) ).
- Test the in-car temperature sensor while 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.
- Compare the resistance reading between the No. 1 and No. 2 terminals of the in-car temperature sensor with the specifications shown in the graph; the resistance should be within the specifications.
- If the resistance is not as specified, replace the in-car temperature sensor (see «IN-CAR TEMPERATURE SENSOR REPLACEMENT»(ref-336497-S28537655172009072700000) ).
Sunlight Sensor Test
Note. Before testing the sensor, check for climate control DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
Scheme 15
- Pull out the sunlight sensor (A) from the dashboard.
- Turn the ignition switch to ON (II). Measure the voltage between the terminals with the (+) probe on the No. 1 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.
- If the voltage is not as specified, replace the sunlight sensor (see «SUNLIGHT SENSOR REPLACEMENT»(ref-336497-S40009170002009072700000) ).
Driver's Air Mix Control Motor Test
Special Tools Required
- Backprobe Set 07SAZ-001000A (2)
Note. Before testing the sensor, check for climate control DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
Scheme 16
- Disconnect the 7P connector from the driver's air mix control motor. NOTE: Incorrectly applying power and ground to the driver's air mix control motor will damage it. Follow the instructions carefully.
- Connect battery power to terminal No. 1 of the driver's air mix control motor, and ground terminal No. 2; the driver's air mix control motor should run, and stop at Max Cool. If it doesn't, reverse the connections; the driver's air mix control motor should run, and stop at Max Hot. When the driver's air mix control motor stops running, disconnect battery power immediately.
- If the driver's air mix control motor did not run in step 2, remove it, then check the driver's air mix control linkage and door for smooth movement. If the linkage and door move smoothly, replace the driver's air mix control motor (see «DRIVER'S AIR MIX CONTROL MOTOR TEST»(ref-336497-S24173015242009072700000) ). If the linkage or door sticks or binds, repair them as needed. If the driver's air mix control motor runs smoothly, Go to step 4.
- Measure the resistance between terminals No. 5 and No. 7 of the driver's air mix control motor. It should be between 4.2 and 7.8 kohms.
- Reconnect the driver's air mix control motor 7P connector, then turn the ignition switch to ON (II).
- Using the backprobe set, measure the voltage between terminals No. 3 and No. 5. Max Cool: About 0.5 V Max Hot: About 4.5 V
- If either the resistance or the voltage readings are not as specified, replace the driver's air mix control motor (see «DRIVER'S AIR MIX CONTROL MOTOR TEST»(ref-336497-S24173015242009072700000) ).
Passenger's Air Mix Control Motor Test
Special Tools Required
- Backprobe Set 07SAZ-001000A (2)
Note. Before testing the sensor, check for climate control DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
Scheme 17
- 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.
- Connect battery power to terminal No. 1 of the passenger's air mix control motor, and ground terminal No. 2; 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.
- 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-336497-S12417643032009072700000) ). 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.
- Measure the resistance between terminals No. 5 and No. 7 of the passenger's air mix control motor. It should be between 4.2 and 7.8 kohms.
- Reconnect the passenger's air mix control motor 7P connector, then turn the ignition switch to ON (II).
- Using the backprobe set, measure the voltage between terminals No. 3 and No. 5. Max Cool: About 1.5 V Max Hot: About 4.5 V
- If either the resistance or the voltage readings are not as specified, replace the passenger's air mix control motor (see «PASSENGER'S AIR MIX CONTROL MOTOR REPLACEMENT»(ref-336497-S12417643032009072700000) ).
Scheme 18
Scheme 19
- Remove the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(ref-336501-S26341478552009072700000) ).
- Remove the self-tapping screws and the duct (A).
- Disconnect the 7P connector (A) from the driver's air mix control motor (B). Remove the self-tapping screws and the driver's air mix control motor from the heater unit.
- 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 20
- Open the glove box. Remove the damper and the glove box stop on each side, then let the glove box hang down (see «DASHBOARD CENTER LOWER COVER DISASSEMBLY/REASSEMBLY»(ref-336501-S06814314892009072700000) ).
- 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.
- With the motor removed, make sure the door linkage moves smoothly and does not bind.
- 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 21
- Remove the driver's dashboard lower cover (see «DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION»(ref-336501-S26341478552009072700000) ).
- Remove the self-tapping screws and the in-car temperature sensor (A) from the driver's dashboard lower cover (B).
- Install the sensor in the reverse order of removal. Be sure to connect the air hose securely.
Scheme 22
- Remove the sunlight sensor (A) from the dashboard, then disconnect the 2P connector (B). Be careful not to damage the sensor and the dashboard.
- Install the sensor in the reverse order of removal.
Scheme 23
- Remove the instrument panel (see «INSTRUMENT PANEL REMOVAL/INSTALLATION»(ref-336501-S12337604372009072700000) ).
- Remove the self-tapping screws and the climate control unit (A). If necessary, replace the bulbs (B).
- Install the control unit in the reverse order of removal. After installation, operate the various functions to see whether works properly.
- Run the self-diagnostic function to confirm that there are no problems in the system (see «HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS»(ref-336497-S38933938662009072700000) ).