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Diagnostic Trouble Code Chart

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

HINT

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

Air Conditioning System 

DIAGNOSTIC TROUBLE CODE CHART

DTC Code Detection Item Trouble Area Memory(4)
B1411/11 (1) Room Temperature Sensor Circuit
  1. Room temperature sensor
  2. Harness or connector between room temperature sensor and A/C amplifier
  3. A/C amplifier
 Memorized (8 5 mm or more)
B1412/12 (2) Ambient Temperature Sensor Circuit
  1. Ambient temperature sensor
  2. Harness or connector between ambient temperature sensor and A/C amplifier
  3. A/C amplifier
 Memorized (8 5 mm or more)
B1413/13  Evaporator Temperature Sensor Circuit
  1. Air conditioning harness
  2. Evaporator temperature sensor
  3. A/C amplifier
 Memorized (8 5 mm or more)
B1418/18  Exhaust Gas Sensor Circuit
  1. Smog ventilation sensor (emission gas sensor)
  2. Harness or 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 or connector between solar sensor and A/C amplifier
  3. Harness or connector between solar sensor and main body ECU
  4. Main body ECU
  5. A/C amplifier
 Memorized (8 5 mm or more) (only when circuit is shorted)
B1423/23  Pressure Sensor Circuit
  1. A/C pressure sensor
  2. Harness or connector between A/C 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)
 -
B1424/24 (3) Solar Sensor Circuit (Driver Side)
  1. Solar sensor
  2. Harness or connector between solar sensor and A/C amplifier
  3. Harness or connector between solar sensor and main body ECU
  4. Main body ECU
  5. A/C amplifier
 Memorized (8 5 mm or more) (only when circuit is shorted)
B1441/41  Air Mix Damper Control Servo Motor Circuit (Passenger Side)
  1. Air mix control servo motor
  2. Air conditioning harness
  3. A/C amplifier
 Memorized (30 sec)
B1442/42  Air Inlet Damper Control Servo Motor Circuit
  1. Air inlet control servo motor
  2. Air conditioning harness
  3. A/C amplifier
 Memorized (30 sec)
B1443/43  Air Outlet Damper Control Servo Motor Circuit
  1. Air outlet control servo motor
  2. Air conditioning harness
  3. A/C amplifier
 Memorized (30 sec)
B1445/45  Front Passenger Seat Side Cool Air Bypass Damper Control Servo Motor Circuit
  1. Cool air by-pass control servo motor
  2. Air conditioning harness
  3. A/C amplifier
 Memorized (30 sec)
B1446/46  Air Mix Damper Control Servo Motor Circuit (Driver Side)
  1. Air mix control servo motor
  2. Air conditioning harness
  3. A/C amplifier
 Memorized (30 sec)
B1451/51  Compressor Solenoid Circuit
  1. A/C compressor
  2. Harness or connector between A/C amplifier and A/C compressor
  3. A/C amplifier
 -
B1461/61  Emission Gas NOx Sensor Circuit
  1. Smog ventilation sensor (emission gas NOx sensor)
  2. Harness or 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 cabin 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.
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