Diagnostic Trouble Code Chart

AIR CONDITIONING SYSTEM

DTC Code	Detection Item	Trouble Area	Memory*2	Refer To
B1412*1	Ambient Temperature Sensor Circuit	1. Ambient temperature sensor 2. Harness or connector between ambient temperature sensor and combination meter 3. Combination meter 4. A/C amplifier 5. CAN communication system	Memorized (8.5 min. or more)	Refer to DTC B1412: Ambient Temperature Sensor Circuit
B1413	Evaporator Temperature Sensor Circuit	1. Evaporator temperature sensor 2. Harness or connector between evaporator temperature sensor and A/C amplifier 3. A/C amplifier	Memorized (8.5 min. or more)	Refer to DTC B1413: Evaporator Temperature Sensor Circuit
B1423	Pressure Sensor Circuit	1. Pressure sensor 2. Harness or connector between pressure sensor and A/C amplifier 3. A/C amplifier 4. Expansion valve (blocked, stuck) 5. Condenser (blocked, deterioration of cooling capacity due to dirt) 6. Cooler dryer (moisture in the refrigerant cycle cannot be absorbed) 7. Cooling fan system (condenser cannot be cooled down) 8. A/C system (leaks, blocked)	-	Refer to DTC B1423: Pressure Sensor Circuit
B1451	Compressor Solenoid Circuit	1. A/C compressor (compressor solenoid) 2. Harness or connector between A/C compressor (compressor solenoid) and A/C amplifier or Body ground 4. A/C amplifier	-	Refer to DTC B1451: Compressor Solenoid Circuit
B1479*3	Flow Sensor Circuit	1. A/C compressor (A/C flow sensor) 2. Harness or connector between A/C compressor (A/C flow sensor) and A/C amplifier 3. A/C amplifier	Memorized (4 sec. or more)	Refer to DTC B1479: Flow Sensor Circuit
B1499	Multiplex Communication Circuit	CAN communication system	Memorized	Refer to DTC B1499: Multiplex Communication Circuit

HINT:

*1: 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.
*2: The A/C amplifier memorizes the DTC of the respective malfunction if it has occurred for the period of time indicated in the brackets.
*3: for 2ZR-FE