WOMS
B code body Medium severity

B1337 Door Ajar RR Circuit Short To Battery

The OBD2 code B1337 indicates a fault in the rear right door ajar circuit, specifically a short to battery, meaning there is an electrical issue causing the circuit to continuously signal that the door is open

Definition

The OBD2 code B1337 indicates a fault in the rear right door ajar circuit, specifically a short to battery, meaning there is an electrical issue causing the circuit to continuously signal that the door is open

Common causes

  • Faulty door ajar switch
  • Shorted wiring or connectors
  • Damaged door harness
  • Corroded terminals
  • Malfunctioning body control module (BCM)
  • Improperly installed or damaged door latch
  • Water intrusion or moisture in electrical components

Common misdiagnoses

  • Faulty door switch
  • Wiring issues in the door harness
  • Malfunctioning body control module (BCM)
  • Short circuit in the wiring
  • Faulty door latch assembly
  • Issues with the vehicle's alarm system
  • Problems with the interior light circuit

Troubleshooting steps

  1. 1. Visual Inspection

    Check Wiring and Connectors: Inspect the wiring harness and connectors related to the rear right door. Look for any signs of damage, fraying, or corrosion

  2. 2. Inspect the Door Ajar Switch

    Examine the door ajar switch for any physical damage or misalignment

  3. 3. Test the Door Ajar Switch

    Multimeter Test: Use a multimeter to test the door ajar switch. Check for continuity when the door is closed and open. The switch should show continuity when the door is open and no continuity when closed

  4. 4. Bypass the Switch

    Temporarily bypass the switch by connecting the wires directly to see if the code clears. If it does, the switch may be faulty

  5. 5. Check for Short Circuits

    Inspect for Shorts: Look for any shorts in the wiring that could be causing the circuit to read as "short to battery." This could include pinched wires or damaged insulation

  6. 6. Grounding Issues

    Ensure that the ground connections are secure and not corroded

  7. 7. Scan for Additional Codes

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

  8. 8. Inspect the Body Control Module (BCM)

    BCM Functionality: If the switch and wiring are in good condition, the issue may lie within the Body Control Module. Check for any software updates or known issues with the BCM

  9. 9. Reprogram or Reset

    In some cases, reprogramming or resetting the BCM may resolve the issue

  10. 10. Clear the Code and Test Drive

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

  11. 11. Test Drive

    Take the vehicle for a test drive to see if the code returns. Monitor the door ajar indicator and ensure it functions correctly

  12. 12. Consult a Professional

    If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model.Additional Tips: - Always refer to the vehicle's service manual for specific wiring diagrams and troubleshooting procedures. - Ensure that the vehicle's battery is in good condition, as electrical issues can sometimes stem from a weak battery. By following these steps, you should be able to identify and resolve the issue related to the B1337 code