WOMS
B code body Medium severity

B1836 Door Unlock Disarm Output Circuit Short To Battery

The OBD2 code B1836 indicates a short circuit in the door unlock disarm output circuit, meaning that the circuit is receiving voltage directly from the battery instead of functioning normally

Definition

The OBD2 code B1836 indicates a short circuit in the door unlock disarm output circuit, meaning that the circuit is receiving voltage directly from the battery instead of functioning normally

Common causes

  • Shorted wiring in the door unlock circuit
  • Faulty door lock actuator
  • Malfunctioning body control module (BCM)
  • Corroded or damaged connectors
  • Improperly installed aftermarket alarm or remote start system
  • Grounding issues in the circuit

Common misdiagnoses

  • Faulty door lock actuator
  • Malfunctioning body control module (BCM)
  • Wiring issues or shorts in the harness
  • Defective door switch
  • Incorrectly diagnosed battery or charging system problems
  • Issues with the key fob or remote entry system
  • Problems with the vehicle's security system or immobilizer
  • Faulty ground connections

Troubleshooting steps

  1. 1. Check the Vehicle's Wiring:

    Inspect the wiring harness associated with the door lock and unlock system. Look for any signs of damage, fraying, or corrosion

  2. 2. Pay special attention to areas where the wiring may be exposed to heat or moving parts

  3. 3. Inspect Connectors:

    Examine the connectors for the door lock system. Ensure they are securely connected and free of corrosion or dirt

  4. 4. Disconnect and reconnect the connectors to ensure a good connection

  5. 5. Test the Door Lock Actuator:

    Use a multimeter to test the door lock actuator for proper operation. Check for continuity and ensure it is functioning correctly

  6. 6. If the actuator is faulty, it may need to be replaced

  7. 7. Check for Short Circuits:

    Use a multimeter to check for continuity between the door unlock circuit and the battery. A short circuit will show continuity where there should be none

  8. 8. If a short is found, trace the wiring to locate the source of the short

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

    The BCM controls the door lock and unlock functions. Check for any fault codes related to the BCM

  10. 10. If the BCM is malfunctioning, it may need to be reprogrammed or replaced

  11. 11. Check Fuses:

    Inspect the fuses related to the door lock system. A blown fuse may indicate an underlying issue

  12. 12. Replace any blown fuses and monitor for recurrence of the code

  13. 13. Scan for Additional Codes:

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

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

  15. 15. Clear Codes and Test Drive:

    After performing the above checks and repairs, clear the trouble codes using an OBD-II scanner

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

  17. 17. Consult Repair Manual:

    Refer to the vehicle’s repair manual for specific wiring diagrams and troubleshooting procedures related to the door lock system

  18. 18. Seek Professional Help:

    If the issue persists after performing these steps, consider seeking assistance from a professional mechanic or automotive technician who has experience with electrical systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1836 code