WOMS
B code body Medium severity

B1475 Accessory Delay Relay Contact Short To Battery

The OBD2 code B1475 indicates a malfunction where the accessory delay relay contact is shorted to the battery, potentially causing issues with the vehicle's accessory power system

Definition

The OBD2 code B1475 indicates a malfunction where the accessory delay relay contact is shorted to the battery, potentially causing issues with the vehicle's accessory power system

Common causes

  • Shorted wiring or connectors
  • Faulty accessory delay relay
  • Malfunctioning body control module (BCM)
  • Corroded or damaged electrical connections
  • Stuck or damaged relay contacts
  • Incorrectly installed aftermarket accessories
  • Water intrusion or moisture damage in electrical components

Common misdiagnoses

  • Faulty accessory delay relay
  • Shorted wiring harness
  • Defective body control module (BCM)
  • Malfunctioning ignition switch
  • Battery issues
  • Faulty fuses
  • Grounding problems

Troubleshooting steps

  1. 1. Check the Vehicle's Battery and Charging System

    Inspect Battery Voltage: Ensure the battery is fully charged and in good condition. A weak battery can cause various electrical issues

  2. 2. Check Alternator Output

    Verify that the alternator is functioning properly and providing adequate voltage

  3. 3. Inspect the Accessory Delay Relay

    Locate the Relay: Find the accessory delay relay in the vehicle’s fuse box or relay panel

  4. 4. Visual Inspection

    Check for any signs of damage, corrosion, or burnt contacts on the relay

  5. 5. Test the Relay

    Swap the relay with a similar one (if available) to see if the code clears. You can also test the relay with a multimeter

  6. 6. Examine Wiring and Connectors

    Inspect Wiring Harness: Look for damaged, frayed, or shorted wires in the circuit related to the accessory delay relay

  7. 7. Check Connectors

    Ensure all connectors are secure and free of corrosion. Clean any dirty contacts

  8. 8. Scan for Additional Codes

    Check for Other Codes: Use an OBD-II scanner to see if there are any other related trouble codes that could provide more context to the issue

  9. 9. Test the Accessory Delay Circuit

    Use a Multimeter: Measure the voltage at the relay terminals to ensure it is receiving the correct voltage

  10. 10. Check Ground Connections

    Ensure that the ground connections for the relay and associated circuits are solid

  11. 11. Inspect Related Components

    Check for Faulty Accessories: Sometimes, a malfunctioning accessory (like a radio, power windows, etc.) can cause issues with the accessory delay relay

  12. 12. Look for Aftermarket Modifications

    If any aftermarket accessories have been installed, ensure they are not causing electrical interference

  13. 13. Clear the Code and Test Drive

    Clear the Code: After performing the above checks and repairs, clear the code using an OBD-II scanner

  14. 14. Test Drive

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

  15. 15. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or an automotive electrician for further diagnosis.Additional Tips: - Always refer to the vehicle’s service manual for specific wiring diagrams and relay locations. - Safety first: Disconnect the battery before working on electrical components to avoid shorts or shocks. By following these steps, you should be able to identify and resolve the issue related to the B1475 code