INSPECTION
Before performing the diagnosis, check the following items which may cause problems in the A/C system.
A/C OR SELF-DIAGNOSIS SYSTEMS DO NOT OPERATE
TROUBLE SYMPTOM
- Set temperature is not indicated on the display, switch LEDs are faulty or switches do not operate.
- Self-diagnosis system does not operate. WIRING DIAGRAM
Scheme 1
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse No. 2 from main fuse box. Check the condition of fuse. | Is the fuse blown out? | Replace the fuse. | Go to step 2. |
| 2 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse No. 17 from fuse & relay box. Check the condition of fuse. | Is the fuse blown out? | Replace the fuse. | Go to step 3. |
| 3 CHECK AUTO A/C CONTROL MODULE POWER CIRCUIT. Pull out the auto A/C control module connector. Measure the voltage between auto A/C control module connector terminal and chassis ground after turning the ignition switch OFF. Connector & terminal (i49) No. 4 (+) - Chassis ground (-) | Is the voltage more than 10 V? | Go to step 4. | Repair the short circuit in harness for power supply line. |
| 4 CHECK AUTO A/C CONTROL MODULE POWER CIRCUIT. Measure the voltage between auto A/C control module connector terminal and chassis ground after turning the ignition switch to the ON position. Connector & terminal (i49) No. 5 (+) - Chassis ground (-) | Is the voltage more than 10 V? | Go to step 5. | Repair the short circuit in harness for power supply line. |
| 5 CHECK AUTO A/C CONTROL MODULE GROUND CIRCUIT. Measure the resistance of harness between auto A/C control module and chassis ground after turning the ignition switch to the ON position. Connector & terminal (i49) No. 11 - Chassis ground | Is the resistance less than 1 ohms? | Go to step 6. | Repair the short circuit in harness for ground line. |
| 6 CHECK POOR CONTACT. Check poor contact of auto A/C control module connector. | Is there poor contact in the connector? | Repair the connector. | Replace the auto A/C control module. |
DIAGNOSTIC PROCEDURE CHART
GENERAL DIAGNOSTIC TABLE
| Symptom | Problem parts |
|---|---|
| A/C system fails to operate. | Fuse Connector (Poor contact) Ground Auto A/C control module Blower fan motor Blower fan relay A/C relay Compressor (Magnet clutch) Evaporator sensor |
| Fuse is blown out. | Fuse Connector (Poor contact) |
| Illumination cannot dim. | Fuse Connector (Poor contact) Auto A/C control module |
| Blower fan does not rotate or fan speed cannot be controlled. | Fuse Connector (Poor contact) Ground Auto A/C control module Blower fan motor Blower fan relay |
| Unable to switch suction vents. | Connector (Poor contact) Auto A/C control module intake door actuator |
| Unable to switch vents. | Connector (Poor contact) Auto A/C control module Mode door actuator |
| The compartment temperature does not rise. (Warm air does not come out.) | Connector (Poor contact) Auto A/C control module Air mix door actuator In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor In-vehicle sensor aspirator hose |
| The compartment temperature does not lower. (Cold air does not come out.) | Connector (Poor contact) Auto A/C control module Air mix door actuator A/C relay Compressor (Magnet clutch) Radiator fan motor Radiator fan relay In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor In-vehicle sensor aspirator hose |
| Compartment temperature is higher or lower than setting temperature. | Auto A/C control module Air mix door actuator In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor In-vehicle sensor aspirator hose |
| Compartment temperature does not quickly respond to setting temperature. | Air mix door actuator In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor In-vehicle sensor aspirator hose |
| Radiator fan does not rotate during A/C operation. | Radiator fan motor Radiator fan relay |
GENERAL DIAGNOSTIC