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.
| DTC (displayed on SUZUKI scan tool) | Diagnosis | 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 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 . | |
| 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 | ||