WOMS
B code body High severity

B1967 A/C Post Heater Sensor Circuit Short To Ground

The OBD2 code B1967 indicates a short circuit to ground in the A/C post heater sensor circuit, which can affect the operation of the air conditioning system

Definition

The OBD2 code B1967 indicates a short circuit to ground in the A/C post heater sensor circuit, which can affect the operation of the air conditioning system

Common causes

  • Damaged wiring or connectors
  • Shorted sensor
  • Faulty A/C post heater sensor
  • Corroded connections
  • Grounding issues in the circuit
  • Faulty control module

Common misdiagnoses

  • Faulty A/C control module
  • Damaged wiring or connectors
  • Faulty A/C compressor
  • Malfunctioning temperature sensors
  • Issues with the HVAC control panel
  • Shorted or damaged fuses
  • Incorrect refrigerant levels
  • Faulty blower motor
  • Problems with the climate control system
  • Software or calibration issues in the vehicle's computer system

Troubleshooting steps

  1. 1. Understand the Code

    B1967: This code typically relates to the A/C post heater sensor circuit, indicating that there is a short to ground in the circuit

  2. 2. Gather Information

    Service Manual: Refer to the vehicle’s service manual for specific details about the A/C post heater sensor and its circuit

  3. 3. Wiring Diagrams

    Obtain wiring diagrams to understand the circuit layout and identify components involved

  4. 4. Visual Inspection

    Wiring and Connectors: Inspect the wiring harness and connectors associated with the A/C post heater sensor for any signs of damage, fraying, or corrosion

  5. 5. Ground Points

    Check for any loose or corroded ground connections that could affect the circuit

  6. 6. Check the Sensor

    Sensor Condition: Inspect the A/C post heater sensor itself for physical damage or signs of wear

  7. 7. Resistance Testing

    Use a multimeter to measure the resistance of the sensor. Compare the readings to the specifications in the service manual

  8. 8. Test the Circuit

    Continuity Test: Perform a continuity test on the wiring from the sensor to the engine control module (ECM) to check for shorts to ground

  9. 9. Voltage Test

    With the ignition on (engine off), check for the proper voltage at the sensor connector. If there is no voltage, trace back to find where the circuit is interrupted

  10. 10. Check for Shorts

    Short to Ground: Use a multimeter to check for continuity between the sensor circuit and ground. If continuity exists, there is a short to ground that needs to be located and repaired

  11. 11. Inspect Related Components

    Check any related components that may share the same circuit or ground point

  12. 12. Clear the Code

    After performing repairs or adjustments, clear the code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

  13. 13. Further Diagnosis

    If the code persists after repairs, further diagnosis may be required, including checking the ECM for faults or considering the possibility of a faulty sensor or wiring issue elsewhere in the system

  14. 14. Consult a Professional

    If you are unable to resolve the issue, it may be beneficial to consult a professional mechanic or technician who has experience with your specific vehicle make and model.Conclusion By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1967 OBD-II code. Always ensure safety precautions are taken when working on vehicle electrical systems