Fail-Safe Table
WARNING: This page is about a different car, the 2008 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.
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.
|
|
| 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.
|
| 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. | |