WOMS
B code body Medium severity

B1247 Panel Dim Switch Circuit Open

The OBD2 code B1247 indicates that there is an open circuit in the panel dimmer switch, which controls the brightness of the dashboard lights

Definition

The OBD2 code B1247 indicates that there is an open circuit in the panel dimmer switch, which controls the brightness of the dashboard lights

Common causes

  • Faulty panel dimmer switch
  • Open circuit in wiring
  • Poor connections or corroded terminals
  • Faulty body control module (BCM)
  • Blown fuse related to the dimmer circuit

Common misdiagnoses

  • Faulty headlight switch
  • Defective dimmer switch
  • Wiring issues or shorts in the circuit
  • Malfunctioning body control module (BCM)
  • Bad ground connections
  • Faulty instrument cluster
  • Incorrectly installed or damaged dashboard components

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information regarding the panel dim switch circuit and wiring diagrams

  2. 2. Visual Inspection

    Inspect the panel dim switch and its wiring for any visible damage, such as frayed wires, corrosion, or loose connections

  3. 3. Check the connectors for any signs of wear or poor contact

  4. 4. Test the Panel Dim Switch

    Use a multimeter to test the resistance of the panel dim switch. It should show continuity when the switch is activated

  5. 5. If the switch is faulty, replace it

  6. 6. Check for Short Circuits

    Inspect the wiring harness for any shorts to ground or other circuits that could cause an open circuit condition

  7. 7. Use a multimeter to check for continuity in the wiring between the switch and the control module

  8. 8. Inspect the Control Module

    If the wiring and switch are in good condition, the issue may lie within the vehicle's control module (BCM or IPC)

  9. 9. Check for any software updates or known issues related to the control module

  10. 10. Scan for Additional Codes

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

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

  12. 12. Clear the Codes

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

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

  14. 14. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model.Additional Tips: - Always ensure the vehicle is turned off and the battery is disconnected when working on electrical components to avoid shorts or shocks. - Document any changes or repairs made during the troubleshooting process for future reference. By following these steps, you should be able to identify and resolve the issue related to the B1247 code