WOMS
B code body Medium severity

B1638 Mirror Driver Right Short To Ground

The OBD2 code B1638 indicates a short circuit condition in the right mirror driver circuit, meaning there is an unintended connection to ground that is affecting the operation of the right side mirror

Definition

The OBD2 code B1638 indicates a short circuit condition in the right mirror driver circuit, meaning there is an unintended connection to ground that is affecting the operation of the right side mirror

Common causes

  • Faulty right mirror driver module
  • Shorted wiring or connectors
  • Damaged mirror motor
  • Corroded or damaged ground connections
  • Malfunctioning switch or control module
  • Water intrusion or moisture damage
  • Incorrect installation or aftermarket modifications

Common misdiagnoses

  • Faulty mirror assembly
  • Wiring harness issues
  • Shorted wiring
  • Faulty body control module (BCM)
  • Incorrectly installed or damaged connectors
  • Malfunctioning power window switch
  • Grounding issues in the electrical system

Troubleshooting steps

  1. 1. Visual Inspection

  2. 2. Check the wiring harness and connectors leading to the right side mirror for any visible damage, fraying, or corrosion

  3. 3. Inspect the mirror assembly for any signs of physical damage or water intrusion

  4. 4. Check for Shorts

  5. 5. Use a multimeter to check for continuity in the wiring. Disconnect the mirror connector and test the wires for shorts to ground

  6. 6. If you find a short, trace the wiring back to locate the source of the short circuit

  7. 7. Inspect the Mirror Motor

  8. 8. The mirror motor itself could be shorted. Disconnect the motor and test it separately to see if it operates correctly

  9. 9. If the motor is faulty, it may need to be replaced

  10. 10. Check the Control Module

  11. 11. If the wiring and mirror motor are in good condition, the issue may lie within the control module that manages the mirror functions. Check for any fault codes related to the control module

  12. 12. If necessary, reprogram or replace the control module

  13. 13. Test the Switch

  14. 14. Inspect the mirror control switch for proper operation. A faulty switch can cause incorrect signals to be sent to the mirror motor

  15. 15. Test the switch with a multimeter to ensure it is functioning correctly

  16. 16. Clear Codes and Test Drive

  17. 17. After performing repairs, clear the OBD-II codes using a scan tool and take the vehicle for a test drive to see if the code returns

  18. 18. Consult Wiring Diagrams

  19. 19. Refer to the vehicle’s service manual for wiring diagrams to better understand the electrical system and pinpoint potential issues

  20. 20. Professional Diagnosis

  21. 21. If the problem persists after performing these steps, consider seeking help from a professional mechanic or an automotive electrician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1638 code. Always ensure safety precautions are taken when working with electrical systems in vehicles