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 REFERENCE CHART

DTC (displayed on SUZUKI scan tool)	Diagnosis	Fail-Safe Operation
DTC (displayed on SUZUKI scan tool)	Diagnosis	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 keeps condition just before malfunction is detected.	HVAC control module controls actuators assuming that inside air temperature is 25 °C (77 °F).
B1503	Evaporator temperature sensor and/or its circuit malfunction	HVAC control module controls actuators assuming that evaporator temperature is -8 °C (17.6 °F).
B1504	Sunload sensor and/or its circuit malfunction (open)	HVAC control module controls actuators assuming that amount of sunlight is 0 W/m2.
B1504	Sunload sensor and/or its circuit malfunction (short)	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.
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 air intake control actuator is stopped.
B1541	Back-up power supply circuit malfunction	-
B1546	A/C refrigerant pressure malfunction	-
B1556	Crankshaft position (CKP) sensor and/or its circuit malfunction	HVAC control module keeps condition just before malfunction is detected.	HVAC control module controls actuators assuming that engine speed is 0 rpm.
B1557	Wheel speed sensor and/or its circuit malfunction	HVAC control module keeps condition just before malfunction is detected.	HVAC control module controls actuators assuming that vehicle speed is 40 km/h (25 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 engine coolant temperature is 90 °C (194 °F).	HVAC control module controls actuators assuming that engine coolant temperature is 30 °C (86 ° F) for 1 minutes. After that, HVAC control module controls actuators assuming that 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 outside air temperature is 20 °C (68 °F).
B1563	A/C refrigerant pressure sensor and/or its circuit malfunction	HVAC control module keeps condition just before malfunction is detected.	HVAC control module controls actuators assuming that refrigerant pressure is 0 Mpa (0 kg/cm2, 0 psi).
U0073	Control module communication bus off	HVAC control module keeps condition just before malfunction is detected.
U0100	Lost communication with ECM
U0140	Lost communication with BCM