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Fail-Safe Table

When any of the following malfunctions (DTCs) is detected, HVAC control module enters fail-safe mode. However, when HVAC control module detects normal operation of A/C system, fail-safe mode is canceled.

FAIL-SAFE TABLE

DTC No. Trouble Area Fail-Safe Operation
When ignition switch is turned ON after malfunction is already detected When malfunction is detected during ignition switch is ON
B1502 Inside air temperature sensor and/or its circuit malfunction HVAC control module controls actuators assuming that inside air temperature is 25°C (77°F).
B1503 Evaporator temperature sensor and/or its circuit malefaction HVAC control module controls actuators assuming that amount of evaporator temperature is -6°C (21.2°F).
B1504 Sunload sensor and/or its circuit malfunction HVAC control module controls actuators assuming that amount of sunlight is 0 W/m2 .
B1511 Temperature control actuator (position sensor) and/or its circuit malfunction Circuit open: Temperature control actuator fixed to "MAX HOT" position.
Circuit short: Temperature control actuator fixed to "MAX COOL" position.
B1512 Air flow control actuator (position sensor) and/or its circuit malfunction Circuit open: Air flow control actuator fixed to "DEF" position.
Circuit short: Air flow control actuator fixed to "VENT" position.
B1513 Temperature control actuator and/or its circuit malfunction Stop the operation of temperature control actuator.
B1514 Air flow control actuator and/or its circuit malfunction Stop the operation of Air flow control actuator.
B1520 Temperature selector malfunction HVAC control module keeps condition just before malfunction is detected. HVAC control module controls actuators assuming that setting of temperature selector is 25°C (77°F).
B1521 Blower speed selector malfunction HVAC control module keeps condition just before malfunction is detected. HVAC control module controls actuators assuming that as follows.
  • Blower speed is minimum.
  • Air flow control actuator fixed to "DEF" position.
B1530 Air intake control actuator (position sensor) and/or its circuit malfunction Circuit open: Air intake control actuator fixed to "FRE" position.
Circuit short: Air intake control actuator fixed to "REC" position.
B1531 Air intake control actuator and/or its circuit malfunction Stop the operation of temperature control actuator.
B1551 Serial communication circuit malfunction HVAC control module keeps condition just before malfunction is detected. HVAC control module controls actuators assuming that as follows.
  • Outside air temperature is 20°C (68°F).
  • Engine coolant temperature is 90°C (194°F).
  • Vehicle speed is 0 km/h (0 mph).
  • Engine speed is 0 RPM.
B1552
B1553 CAN communication circuit malfunction
B1556 Camshaft position (CMP) sensor and/or its circuit malfunction HVAC control module keeps condition just before malfunction is detected. HVAC control module controls actuators assuming that amount of engine speed is 0 RPM.
B1557 Vehicle speed sensor and/or its circuit malfunction HVAC control module keeps condition just before malfunction is detected. HVAC control module controls actuators assuming that amount of vehicle speed is 0 km/h (0 mph).
B1561 Engine coolant temperature sensor and/or its circuit malfunction HVAC control module keeps condition just before malfunction is detected. HVAC control module controls actuators assuming that amount of engine coolant temperature is 90°C (194°F).
B1562 Outside air temperature sensor and/or its circuit malfunction HVAC control module keeps condition just before malfunction is detected. HVAC control module controls actuators assuming that amount of outside air temperature is 20°C (68°F).
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