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B1315 Battery Saver Relay Coil Circuit Short To Battery

The OBD2 code B1315 indicates a short circuit in the battery saver relay coil circuit, meaning the circuit is receiving continuous power instead of being controlled as intended, which can lead to battery drain or...

Definition

The OBD2 code B1315 indicates a short circuit in the battery saver relay coil circuit, meaning the circuit is receiving continuous power instead of being controlled as intended, which can lead to battery drain or malfunction of the battery saver system

Common causes

  • Shorted wiring or connectors
  • Faulty battery saver relay
  • Malfunctioning power distribution module
  • Corroded or damaged electrical connections
  • Faulty body control module (BCM)
  • Incorrectly installed aftermarket accessories
  • Grounding issues in the circuit

Common misdiagnoses

  • Faulty battery
  • Bad alternator
  • Defective battery saver relay
  • Wiring issues or shorts in the circuit
  • Faulty body control module (BCM)
  • Corroded connectors
  • Incorrectly installed aftermarket accessories

Troubleshooting steps

  1. 1. Check the Battery and Connections:

    Inspect the battery for any signs of corrosion, damage, or loose connections

  2. 2. Ensure that the battery terminals are clean and tightly connected

  3. 3. Inspect the Battery Saver Relay:

    Locate the battery saver relay in the fuse box or relay panel

  4. 4. Check the relay for any signs of damage or corrosion

  5. 5. Swap the relay with a similar one (if available) to see if the issue persists

  6. 6. Examine Wiring and Connectors:

    Inspect the wiring harness and connectors associated with the battery saver relay for any signs of damage, fraying, or short circuits

  7. 7. Look for any exposed wires that may be touching the vehicle's chassis or other components

  8. 8. Test the Relay Circuit:

    Use a multimeter to test the voltage and continuity of the relay coil circuit

  9. 9. Check for any shorts to ground or battery voltage in the circuit

  10. 10. Check for Faulty Components:

    Inspect any components that are powered by the battery saver relay, such as lights or accessories, for faults that could cause excessive current draw

  11. 11. Disconnect these components one at a time to see if the code clears

  12. 12. Scan for Additional Codes:

    Use an OBD-II scanner to check for any other related trouble codes that may provide additional context for the issue

  13. 13. Address any other codes that may be present

  14. 14. Inspect the Body Control Module (BCM):

    If the above steps do not resolve the issue, the problem may lie within the BCM, which controls the battery saver relay

  15. 15. Check for software updates or faults in the BCM

  16. 16. Clear the Code and Test Drive:

    After performing the necessary repairs, clear the trouble code using an OBD-II scanner

  17. 17. Take the vehicle for a test drive to see if the code returns

  18. 18. Consult a Professional:

    If the issue persists after following these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1315 code