Lexus IS250 IS220d GSE20 ALE20 - AIR CONDITIONING
AIR CONDITIONING SYSTEM - DIAGNOSTIC TROUBLE CODE CHART
| DTC No. | Detection Item | Trouble Area | Memory*4 | See page |
| B1411/11*1 | Room Temperature Sensor Circuit | 1. Room temperature sensor 2. Harness and connector between room temperature sensor and A/C amplifier 3. A/C amplifier | Memorized (8.5 min. or more) | |
| B1412/12*2 | Ambient Temperature Sensor Circuit | 4GR-FSE: 1. Ambient temperature sensor 2. Harness and connector between ambient temperature sensor and ECM 3. ECM 4. Multiplex communication circuit 5. A/C amplifier 2AD-FHV: 1. Ambient temperature sensor 2. Harness or connector between ambient temperature sensor and A/C amplifier 3. A/C amplifier | Memorized (8.5 min. or more) | |
| B1413/13 | Evaporator Temperature Sensor Circuit | 1. Air conditioning harness (evaporator temperature sensor) 2. A/C amplifier | Memorized (8.5 min. or more) | |
| B1418/18*5 | Exhaust Gas Sensor Circuit | 1. Smog ventilation sensor (emission gas sensor) 2. Harness and connector between smog ventilation sensor (emission gas sensor) and A/C amplifier 3. A/C amplifier | - | |
| B1421/21*3 | Solar Sensor Circuit (Passenger Side) | 1. Solar sensor 2. Harness and connector between solar sensor and A/C amplifier 3. Harness and connector between solar sensor and multiplex network body ECU (cowl side junction block ECU RH) 4. A/C amplifier | Memorized (8.5 min. or more) (only when circuit is shorted) | |
| B1422/22*5 | Compressor Lock Sensor Circuit | 1. A/C compressor 2. A/C compressor drive belt 3. A/C compressor and magnetic clutch lock sensor 4. Harness and connector between ECM and A/C compressor 5. ECM 6. A/C amplifier | - | |
| B1423/23 | Pressure Switch Circuit | 1. Pressure sensor 2. Harness and connector between pressure sensor and A/C amplifier 3. Refrigerant pipe line 4. A/C amplifier | - | |
| B1424/24*3 | Solar Sensor Circuit (Driver Side) | 1. Solar sensor 2. Harness and connector between solar sensor and A/C amplifier 3. Harness and connector between solar sensor and multiplex network ECU (cowl side junction block ECU RH) 4. A/C amplifier | Memorized (8.5 min. or more) (only when circuit is shorted) | |
| B1441/41 | Air Mix Damper Control Servo Motor Circuit (Passenger Side) | 1. A/C amplifier 2. Air conditioning harness 3. Air mix control servo motor | Memorized (30 sec.) | |
| B1442/42 | Air Inlet Damper Control Servo Motor Circuit | 1. A/C amplifier 2. Air conditioning harness 3. Air inlet control servo motor | Memorized (30 sec.) | |
| B1443/43 | Air Outlet Damper Control Servo Motor Circuit | 1. A/C amplifier 2. Air conditioning harness 3. Air outlet control servo motor | Memorized (30 sec.) | |
| B1445/45 | Front Passenger Seat Side Cool Air Bypass Damper Control Servo Motor Circuit | 1. A/C amplifier 2. Air conditioning harness 3. Cool air by-pass damper control servo motor | Memorized (30 sec.) | |
| B1446/46 | Air Mix Damper Control Servo Motor Circuit (Driver Side) | 1. A/C amplifier 2. Air conditioning harness 3. Air mix control servo motor | Memorized (30 sec.) | |
| B1451/51 | Compressor Solenoid Circuit | 1. A/C compressor 2. Harness and connector between A/C amplifier and solenoid of externally changeable compressor 3. A/C amplifier | - | |
| B1461/61*5 | Emission Gas NOx Sensor Circuit | 1. Smog ventilation sensor (emission gas NOx sensor) 2. Harness and connector between smog ventilation sensor (emission gas NOx sensor) and A/C amplifier 3. A/C amplifier | - | |
| B1497/97 | BUS IC Communication Malfunction | 1. Air conditioning harness 2. A/C amplifier | Memorized (10 sec. or more) | |
| B1499/99 | Multiplex Communication Circuit | Multiplex communication system | Memorized |
*1: If the room temperature is approx. -18.6°C (-1.48°F) or lower, DTC B1411/11 may be output even though the system is normal.
*2: If the ambient temperature is approx. -52.9°C (-63.22°F) or lower, DTC B1412/12 may be output even though the system is normal.
*3: If the check is performed in a dark place, DTC B1421/21 or B1424/24 (solar sensor circuit abnormal) may be output.
*4: The A/C amplifier memorizes the DTC of the respective malfunction if it has occurred for the period of time indicated in the brackets.
*5: Except 2AD-FHV
LEXUS IS250, IS220d / GSE20 ALE20