Fail-Safe Table

WARNING: This page is about a different car, the 2007 Suzuki Grand Vitara and 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

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
DTC No.	Trouble Area	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	Serial communication circuit malfunction
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).