LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2007 >> GS 450h >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning >> Air Conditioning System >> Diagnostic Trouble Code Chart

Diagnostic Trouble Code Chart

HINT:

When the air conditioning system functions properly, DTC B1400/00 is output.

A/C amplifier 

DIAGNOSTIC TROUBLE CODE CHART - A/C AMPLIFIER

DTC No. Detection Item Trouble Area Memory* Diagnostic Note
B1411/11  Room Temperature Sensor Circuit
  • Room temperature sensor
  • Wire harness between room temperature sensor and A/C amplifier
  • A/C amplifier
Memorized (8.5 min. or more) 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.
B1412/12  Ambient Temperature Sensor Circuit
  • Ambient temperature sensor
  • Wire harness between ambient temperature sensor and ECM
  • ECM
  • Multiplex communication circuit
  • A/C amplifier
Memorized (8.5 min. or more) If ambient temperature is approx. -52.9°C (-63.22°F) or lower, a malfunction code may be output even through the system is normal.
B1413/13  Evaporator Temperature Sensor Circuit
  • Air conditioning harness (evaporator temperature sensor)
  • A/C amplifier
Memorized (8.5 min. or more) -
B1418/18  Exhaust Gas Sensor Circuit
  • Exhaust gas sensor (smog ventilation sensor)
  • Wire harness between exhaust gas sensor (smog ventilation sensor) and A/C amplifier
  • A/C amplifier
- -
B1421/21  Solar Sensor Circuit (Passenger Side)
  • Solar sensor
  • Wire harness between solar sensor and A/C amplifier
  • Wire harness between solar sensor and main body ECU RH (cowl side junction block ECU RH)
  • A/C amplifier
Memorized (8.5 min. or more) (only when circuit is shorted) If the check is performed in a dark place, DTC B1424/24 (solar sensor circuit abnormal) may be output.
B1423/23  Pressure Sensor Circuit
  • Pressure sensor
  • Wire harness between pressure sensor and A/C amplifier
  • Refrigerant pipe line
  • A/C amplifier
- -
B1424/24  Solar Sensor Circuit (Driver Side)
  • Solar sensor
  • Wire harness between solar sensor and A/C amplifier
  • Wire harness between solar sensor and main body ECU RH (cowl side junction block ECU RH)
  • A/C amplifier
Memorized (8.5 min. or more) (only when circuit is shorted) If the check is performed in a dark place, DTC B1421/21 or B1424/24 (solar sensor circuit abnormal) may be output.
B1441/41  Air Mix Damper Control Servo Motor Circuit (Passenger Side)
  • A/C amplifier
  • Air conditioning harness
  • Air inlet control servo motor
Memorized (30 sec.) -
B1442/42  Air Inlet Damper Control Servo Motor Circuit
  • A/C amplifier
  • Air conditioning harness
  • Air inlet control servo motor
Memorized (30 sec.) -
B1443/43  Air Outlet Damper Control Servo Motor Circuit
  • A/C amplifier
  • Air conditioning harness
  • Air outlet control servo motor
Memorized (30 sec.) -
B1445/45  Front Passenger Seat Side Cool Air Bypass Damper Control Servo Motor Circuit
  • Cool air bypass damper control servo motor
  • Air conditioning harness
  • A/C amplifier
Memorized (30 sec.) -
B1446/46  Air Mix Damper Control Servo Motor Circuit (Driver Side)
  • A/C amplifier
  • Air conditioning harness
  • Air mix damper control servo motor
Memorized (30 sec.) -
B1461/61  Emission Gas NOx Sensor Circuit
  • Exhaust gas sensor (smog ventilation sensor)
  • Wire harness between exhaust gas sensor (smog ventilation sensor) and A/C amplifier
  • A/C amplifier
- -
B1462/62  Room Humidity Sensor Circuit
  • Room humidity sensor (room temperature sensor)
  • Wire harness between room humidity sensor (room temperature sensor) and A/C amplifier
  • A/C amplifier
- -
B1471/71  A/C Inverter High Voltage Power Resource System Malfunction
  • Wire harness between compressor assembly and inverter assembly
  • Compressor assembly
  • Hybrid control system
  • Inverter assembly
Memorized -
B1472/72  A/C Inverter High Voltage Output System Malfunction
  • Compressor assembly
Memorized -
B1473/73  A/C Inverter Start-up Signal System Malfunction
  • Wire harness between hybrid vehicle control ECU and compressor assembly
  • Compressor assembly
  • Hybrid control system
- -
B1474/74  A/C Inverter Malfunction
  • Compressor assembly
Memorized -
B1475/75  A/C Inverter Cooling / Heating System Malfunction
  • Cooling fan system
  • Refrigerant volume
  • Compressor assembly
Memorized -
B1476/76  A/C Inverter Load System Malfunction
  • Refrigerant volume
  • Compressor assembly
  • Cooling fan system
Memorized -
B1477/77  A/C Inverter Low Voltage Power Resource System Malfunction
  • Compressor assembly
Memorized -
B1497/97  BUS IC Communication Malfunction
  • Wire harness
  • A/C amplifier
Memorized (10 sec. or more) -
B1498/98  Communication Malfunction (A/C Inverter Local)
  • Wire harness between hybrid vehicle control ECU and compressor assembly and body ground
  • Hybrid vehicle control ECU
  • Compressor assembly
  • Inverter assembly
  • Air conditioning harness
Memorized -
B1499/99  Multiplex Communication Circuit
  • Air conditioning amplifier
  • ECM
  • Combination meter
  • CAN communication line
Memorized -
P0AA6-611  Hybrid Battery Voltage System Isolation Fault
  • Compressor oil
  • Compressor assembly
- -
HINT:
*: The A/C amplifier memorizes the DTC of the respective malfunction that has occurred for a period of the time indicated in the brackets.