| Entire A/C system does not operate |
1. IG POWER SOURCE CIRCUIT |
| 2. A/C amplifier assembly. See REMOVAL |
| Air Flow Control: No blower operation |
1. HEATER RELAY CIRCUIT |
| 2. BLOWER MOTOR CIRCUIT |
| 3. A/C amplifier assembly. See REMOVAL |
| Air Flow Control: No blower control |
1. HEATER RELAY CIRCUIT |
| 2. BLOWER MOTOR CIRCUIT |
| 3. A/C amplifier assembly. See REMOVAL |
| Air Flow Control: Insufficient air output |
1. BLOWER MOTOR CIRCUIT |
| 2. A/C amplifier assembly. See REMOVAL |
| Temperature Control: No cool air comes out |
1. VOLUME OF REFRIGERANT |
| 2. REFRIGERANT PRESSURE |
| 3. PRESSURE SWITCH CIRCUIT |
| 4. AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE) |
| 5. AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE) |
| 6. AIR MIX DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE) |
| 7. AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) |
| 8. ROOM TEMPERATURE SENSOR CIRCUIT . |
| 9. ROOM HUMIDITY SENSOR CIRCUIT |
| 10. AMBIENT TEMPERATURE SENSOR CIRCUIT |
| 11. EVAPORATOR TEMPERATURE SENSOR CIRCUIT |
| 12. A/C amplifier assembly. See REMOVAL |
| 13. Multiplex communication circuit. See HOW TO PROCEED WITH TROUBLESHOOTING |
| Temperature Control: No warm air comes out |
1. HEATER RELAY CIRCUIT |
| 2. HEATER WATER PUMP CIRCUIT |
| 3. AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE) |
| 4. AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE) |
| 5. AIR MIX DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE) |
| 6. AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) |
| 7. ROOM TEMPERATURE SENSOR CIRCUIT |
| 8. ROOM HUMIDITY SENSOR CIRCUIT |
| 9. AMBIENT TEMPERATURE SENSOR CIRCUIT |
| 10. EVAPORATOR TEMPERATURE SENSOR CIRCUIT |
| 11. Heater radiator unit sub-assembly. See DISASSEMBLY |
| 12. A/C amplifier assembly. See REMOVAL |
| 13. Multiplex communication circuit. See HOW TO PROCEED WITH TROUBLESHOOTING |
| Temperature Control: Output air is warmer or cooler than set temperature or response is slow |
1. VOLUME OF REFRIGERANT |
| 2. REFRIGERANT PRESSURE |
| 3. AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE) |
| 4. AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE) |
| 5. AIR MIX DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE) |
| 6. AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) |
| 7. ROOM TEMPERATURE SENSOR CIRCUIT |
| 8. ROOM HUMIDITY SENSOR CIRCUIT |
| 9. AMBIENT TEMPERATURE SENSOR CIRCUIT |
| 10. SOLAR SENSOR CIRCUIT (DRIVER SIDE) |
| 11. SOLAR SENSOR CIRCUIT (PASSENGER SIDE) |
| 12. Expansion valve. See DISASSEMBLY |
| 13. Heater radiator unit sub-assembly. See DISASSEMBLY |
| 14. A/C amplifier assembly. See REMOVAL |
| 15. Multiplex communication circuit. See HOW TO PROCEED WITH TROUBLESHOOTING |
| Temperature Control: No temperature control (only Max. cool or Max. warm) |
1. ROOM TEMPERATURE SENSOR CIRCUIT |
| 2. ROOM HUMIDITY SENSOR CIRCUIT |
| 3. AMBIENT TEMPERATURE SENSOR CIRCUIT |
| 4. AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE) |
| 5. AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE) |
| 6. AIR MIX DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE) |
| 7. AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) |
| 8. A/C amplifier assembly. See REMOVAL |
| No air inlet control |
1. AIR INLET DAMPER CONTROL SERVOMOTOR CIRCUIT |
| 2. AIR INLET DAMPER POSITION SENSOR CIRCUIT |
| 3. A/C amplifier assembly. See REMOVAL |
| No air outlet control |
1. AIR OUTLET DAMPER CONTROL SERVOMOTOR CIRCUIT |
| 2. AIR OUTLET DAMPER POSITION SENSOR CIRCUIT |
| 3. A/C amplifier assembly. See REMOVAL |
| Engine idle does not occur, or is continuous |
1. A/C amplifier assembly. See REMOVAL |
| 2. Multiplex communication circuit. See HOW TO PROCEED WITH TROUBLESHOOTING |
| Displayed set temperature value does not match with operation of temperature control switch |
1. A/C amplifier assembly. See REMOVAL |
| Brightness does not change when rheostat volume or light control |
1. Illumination light system |
| 2. A/C amplifier assembly. See REMOVAL |
| Unable to access the diagnosis mode |
1. A/C amplifier assembly. See REMOVAL |
| DTC is not recorded. Set mode is cleared when IG switch is turned off. |
1. BACK-UP POWER SOURCE CIRCUIT |
| 2. A/C amplifier assembly. See REMOVAL |
| Unable to control A/C with the multi-display |
1. Multiplex communication circuit. See HOW TO PROCEED WITH TROUBLESHOOTING |
| 2. Multi-display assembly (w/ Navigation System). See MULTI-DISPLAY |
| 3. Integration control & panel assembly (w/o Navigation System). See REMOVAL |
| 4. A/C amplifier assembly. See REMOVAL |