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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.

NOTE:
  • For LCD model, DTC No. with asterisk (*) mark in the following table can not be detected by HVAC control module.
  • For DTC B1563, only LCD model can be detected by HVAC control module.
FAIL-SAFE OPERATION AND TROUBLE AREA REFERENCE

DTC No. Trouble Area Fail-Safe Operation
When malfunction is detected during ignition switch is ON When ignition switch is turned ON after malfunction is already detected
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 keeps condition just before malfunction is detected. 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 Temperature control actuator is operated to "MAX HOT" direction for specified time. After that, operation of temperature control is actuator is stopped.
B1512  Air flow control actuator (position sensor) and/or its circuit malfunction Air flow control actuator is operated to "DEF" position direction for specified time. After that, operation of air flow control actuator is stopped.
B1513  Temperature control actuator and/or its circuit malfunction Operation of temperature control actuator is stopped.
B1514  Air flow control actuator and/or its circuit malfunction Operation of Air flow control actuator is stopped.
B1520 * Temperature selector malfunction HVAC control module controls actuators assuming that setting of temperature selector is 25°C (77°F).
B1521 * Blower speed selector malfunction HVAC control module controls actuators assuming that as follows.
  • Blower speed is minimum.
B1530  Air intake control actuator (position sensor) and/or its circuit malfunction Air intake control actuator is operated to "FRE" direction for specified time. After that, operation of air intake control actuator is stopped.
B1531  Air intake control actuator and/or its circuit malfunction Operation of temperature control actuator is stopped.
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 for 1 minutes. After that, HVAC control module controls actuators assuming that amount of engine coolant temperature is 90°C (194°F). HVAC control module controls actuators assuming that amount of engine coolant temperature is 30°C (86°F) for 1 minutes. After that, 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).
B1563  A/C refrigerant pressure mulfunetion HVAC control module controls actuators assuming that amount of refrigerant pressure is 0 MPa.
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