WOMS
B code body Medium severity

B1679 Alarm Panic Input Circuit Short To Battery

The OBD2 code B1679 indicates a malfunction in the alarm panic input circuit, specifically that the circuit is shorted to the battery, which may cause the alarm system to trigger incorrectly or not function properly

Definition

The OBD2 code B1679 indicates a malfunction in the alarm panic input circuit, specifically that the circuit is shorted to the battery, which may cause the alarm system to trigger incorrectly or not function properly

Common causes

  • Shorted wiring or connectors
  • Faulty alarm system components
  • Corroded or damaged connectors
  • Malfunctioning body control module (BCM)
  • Incorrectly installed aftermarket alarm system
  • Grounding issues
  • Faulty panic button or switch

Common misdiagnoses

  • Faulty alarm system
  • Defective key fob
  • Wiring issues
  • Shorted connectors
  • Malfunctioning body control module (BCM)
  • Battery issues
  • Grounding problems
  • Incorrectly programmed key fob

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information related to the alarm system and wiring diagrams

  2. 2. Visual Inspection

  3. 3. Inspect the wiring and connectors associated with the alarm system, particularly the panic input circuit. Look for any signs of damage, corrosion, or loose connections

  4. 4. Check for any frayed wires or exposed conductors that could be causing a short to battery

  5. 5. Test the Alarm System

  6. 6. If the vehicle is equipped with an aftermarket alarm system, ensure that it is installed correctly and functioning as intended

  7. 7. Temporarily disconnect the alarm system to see if the code clears. If it does, the issue may be with the alarm system itself

  8. 8. Check for Shorts

  9. 9. Use a multimeter to check for continuity in the panic input circuit. Disconnect the battery and test the circuit for any shorts to ground or battery voltage

  10. 10. If you find a short, trace the wiring to locate the source of the short

  11. 11. Inspect the Alarm Module

  12. 12. If applicable, check the alarm module for any faults. This may involve testing the module with a scan tool or replacing it if necessary

  13. 13. Check Fuses

  14. 14. Inspect the fuses related to the alarm system. A blown fuse may indicate an overload or short circuit in the system

  15. 15. Scan for Additional Codes

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

  17. 17. Reset the Code

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

  19. 19. Consult a Professional

  20. 20. If you are unable to resolve the issue, consider consulting a professional mechanic or automotive electrician who has experience with alarm systems and OBD-II diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1679 code. Always ensure safety precautions are taken when working with electrical systems in vehicles