Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2007 Suzuki SX4 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Air Conditioning System DTCS
AIR CONDITIONING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Detection item | Condition when trouble detected (DTC is determined when following condition detected) |
|---|---|---|
| B1502 | Inside Air Temperature Sensor Circuit Malfunction | Signal voltage of inside air temperature sensor is higher than specification. |
| Signal voltage of inside air temperature sensor is lower than specification. | ||
| B1503 | Evaporator Temperature Sensor Circuit Malfunction | Signal voltage of evaporator temperature sensor is higher than specification. |
| Signal voltage of evaporator temperature sensor is lower than specification. | ||
| B1504 | Sun load Sensor Circuit Malfunction |
|
| Signal voltage of sun load sensor is lower than specification. | ||
| B1511 | Temperature Control Actuator (Position Sensor) and/or Its Circuit Malfunction | Signal voltage of position sensor included in temperature control actuator is higher than specification. |
| Signal voltage of position sensor included in temperature control actuator is lower than specification. | ||
| B1512 | Air Flow Control Actuator (Position Sensor) and/or Its Circuit Malfunction | Signal voltage of position sensor included in airflow control actuator is higher than specification. |
| Signal voltage of position sensor included in airflow control actuator is lower than specification. | ||
| B1513 | Temperature Control Actuator (Motor) and/or Its Circuit Malfunction | Motor of temperature control actuator is not operated more than specified time. |
| B1514 | Air Flow Control Actuator (Motor) and/or Its Circuit Malfunction | Motor of air flow control actuator is not operated more than specified time. |
| B1520 | Temperature Selector Malfunction | Signal voltage of temperature selector in HVAC control module is higher than specification. |
| Signal voltage of temperature selector in HVAC control module is lower than specification. | ||
| B1521 | Blower Speed Selector Malfunction | Signal voltage of blower speed selector in HVAC control module is higher than specification. |
| Signal voltage of blower speed selector in HVAC control module is lower than specification. | ||
| B1522 | Air Flow Selector Malfunction | Signal voltage of airflow selector in HVAC control module is higher than specification. |
| Signal voltage of airflow selector in HVAC control module is lower than specification. | ||
| B1541 | Back-up Power Supply Circuit Malfunction |
|
| B1546 | A/C Refrigerant Pressure Malfunction |
|
| B1551 | Serial Communication Circuit Malfunction | Circuit voltage of serial communication circuit is higher than specification. |
| Circuit voltage of serial communication circuit is lower than specification. | ||
| B1552 | HVAC Control Module Check Sum Error | HVAC control module received unspecified data from BCM more than 8 times. |
| B1553 | CAN Communication Circuit Malfunction | HVAC control module received signal indicating reception error from ECM. |
| B1557 | VSS Signal Failure | HVAC control module receives invalid data of VSS signal from BCM. |
| B1561 | ECT signal Failure | HVAC control module receives invalid data of ECT signal from BCM. |
| B1562 | Outside Temperature Sensor Signal Failure | HVAC control module receives invalid data of outside air temperature sensor signal from BCM. |
| B1563 | A/C Refrigerant Pressure Sensor Signal Failure | HVAC control module receives invalid data of A/C refrigerant pressure sensor signal from BCM. |
| B1570 | Engine Type Signal Failure | HVAC control module receives invalid data of engine type signal from BCM. |
| B1571 | Combination Meter Spec Signal Failure | HVAC control module receives invalid data of combination meter Spec signal from BCM. |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.