WOMS
B code body Medium severity

B2563 Aux A/C Blower Speed 2 Circuit Failure

The OBD2 code B2563 indicates a malfunction in the auxiliary air conditioning blower speed 2 circuit, suggesting a failure in the electrical system or components related to that specific blower speed

Definition

The OBD2 code B2563 indicates a malfunction in the auxiliary air conditioning blower speed 2 circuit, suggesting a failure in the electrical system or components related to that specific blower speed

Common causes

  • Faulty blower motor resistor
  • Damaged wiring or connectors
  • Blower motor failure
  • Faulty HVAC control module
  • Short circuit in the blower speed circuit
  • Open circuit in the blower speed circuit
  • Poor ground connection

Common misdiagnoses

  • Faulty blower motor
  • Blower motor resistor failure
  • Wiring issues or shorts
  • Faulty HVAC control module
  • Incorrectly calibrated climate control system
  • Failed auxiliary A/C compressor
  • Low refrigerant levels
  • Faulty temperature sensors

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information related to the A/C system and the B2563 code. This can provide insights into the circuit layout and components involved

  2. 2. Visual Inspection

    Wiring and Connectors: Inspect the wiring harness and connectors associated with the auxiliary A/C blower. Look for signs of damage, corrosion, or loose connections

  3. 3. Blower Motor

    Check the auxiliary blower motor for any physical damage or obstructions

  4. 4. Scan for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes that may provide more context or indicate additional issues

  5. 5. Test the Blower Motor

    Direct Power Test: Apply direct power to the auxiliary blower motor to see if it operates. If it does not, the motor may be faulty and require replacement

  6. 6. Resistance Check

    Measure the resistance of the blower motor using a multimeter. Compare the readings to the specifications in the service manual

  7. 7. Check the Blower Motor Resistor

    The blower motor resistor controls the speed of the blower. Test the resistor for continuity and proper operation. If it’s faulty, it may need to be replaced

  8. 8. Inspect the Control Module

    Check the A/C control module for any faults. This may involve testing the module for proper operation and ensuring it is receiving the correct signals

  9. 9. Check Fuses and Relays

    Inspect the fuses and relays associated with the auxiliary A/C system. Replace any blown fuses and test the relays to ensure they are functioning correctly

  10. 10. Wiring Continuity Test

    Perform a continuity test on the wiring between the A/C control module and the blower motor. Look for any breaks or shorts in the wiring

  11. 11. Check for Ground Issues

    Ensure that the blower motor and control module have a good ground connection. Poor grounding can lead to circuit failures

  12. 12. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.1

  13. 13. Professional Diagnosis

    If the issue persists after performing these steps, consider seeking help from a professional mechanic or technician who has experience with automotive HVAC systems. By following these troubleshooting steps, you should be able to identify the cause of the B2563 code and take appropriate action to resolve the issue