WOMS
B code body Medium severity

B1264 Servo Motor Foot Circuit Failure

The OBD2 code B1264 indicates a malfunction in the servo motor foot circuit, which is responsible for controlling the footwell air distribution in the vehicle's climate control system

Definition

The OBD2 code B1264 indicates a malfunction in the servo motor foot circuit, which is responsible for controlling the footwell air distribution in the vehicle's climate control system

Common causes

  • Faulty servo motor
  • Damaged wiring or connectors
  • Short circuit in the foot circuit
  • Open circuit in the foot circuit
  • Failed control module
  • Corroded terminals
  • Poor ground connection
  • Malfunctioning foot switch

Common misdiagnoses

  • Faulty brake pedal switch
  • Wiring issues or shorts in the circuit
  • Malfunctioning accelerator pedal position sensor
  • Defective throttle body or actuator
  • Issues with the engine control module (ECM)
  • Problems with the body control module (BCM)
  • Low battery voltage or electrical system issues
  • Faulty servo motor or actuator itself

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues

  2. 2. Inspect the Wiring and Connectors

    Visually inspect the wiring harness and connectors associated with the servo motor and HVAC system. Look for signs of damage, corrosion, or loose connections

  3. 3. Ensure that all connectors are securely attached and free of dirt or moisture

  4. 4. Test the Servo Motor

    If accessible, test the servo motor for proper operation. You can do this by applying power directly to the motor to see if it responds

  5. 5. If the motor does not operate when powered directly, it may need to be replaced

  6. 6. Check the HVAC Control Module

    The HVAC control module may be malfunctioning. Check for proper operation and communication with the servo motor

  7. 7. If possible, perform a reset or reprogramming of the module to see if that resolves the issue

  8. 8. Inspect Fuses and Relays

    Check the fuses and relays associated with the HVAC system and servo motor. Replace any blown fuses or faulty relays

  9. 9. Test the Power and Ground Circuits

    Use a multimeter to check for proper voltage and ground at the servo motor connector. Ensure that the motor is receiving the correct voltage when commanded by the control module

  10. 10. Check for Mechanical Obstructions

    Inspect the HVAC system for any mechanical obstructions that may prevent the servo motor from moving freely. This could include debris or broken components within the HVAC housing

  11. 11. Perform a Calibration

    Some vehicles require a calibration procedure for the HVAC system after repairs. Consult the vehicle’s service manual for specific calibration steps

  12. 12. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the B1264 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  13. 13. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle's HVAC system. By following these troubleshooting steps, you should be able to identify and resolve the cause of the B1264 code. Always refer to the vehicle's service manual for specific procedures and specifications