The Blind Spot Monitoring (BSM) system is a safety feature that alerts drivers to vehicles in their blind spots. If the warning light stays on continuously, follow this guide to diagnose and fix the issue.
Contents
1. Diagnose the Issue
- Check for error messages: Look for dashboard warnings like “Blind Spot System Unavailable.”
- Inspect BSM sensors: Locate the sensors (usually in the rear bumper) and check for:
- Dirt, mud, or debris covering the sensors.
- Physical damage (cracks, dents).
- Misalignment (sensors should be flush with the bumper).
- Use an OBD-II scanner: Check for fault codes related to the BSM system (e.g., U0121, C1A00).
2. Common Causes & Fixes
A. Dirty or Blocked Sensors
- Fix: Clean the sensors with a soft, damp cloth. Avoid abrasive cleaners.
- Prevention: Regularly clean the rear bumper, especially after off-roading.
B. Faulty Sensor or Wiring
- Fix:
- Inspect wiring harnesses for damage or corrosion.
- Test sensor connections with a multimeter (refer to Jeep service manual for specs).
- Replace damaged sensors (typical cost: $200–$400 per sensor).
C. Software Glitch
- Fix: Reset the system by:
- Disconnecting the negative battery terminal for 10 minutes.
- Reconnecting and restarting the vehicle.
D. Fuse or Relay Failure
- Fix:
- Locate the BSM fuse in the power distribution center (check owner’s manual for location).
- Replace blown fuses (typically 10A–20A).
3. Advanced Troubleshooting
- Sensor recalibration: Requires a professional scan tool (e.g., WiTech or JSCAN) to recalibrate sensors.
- Firmware update: Visit a Jeep dealership to check for BSM system updates (TSB may apply).
4. Preventive Maintenance
- Clean sensors monthly, especially in winter (salt buildup can interfere).
- Avoid aftermarket bumper modifications that block sensor visibility.
- Check for recalls or technical service bulletins (TSBs) related to BSM.
When to Seek Professional Help: If the issue persists after basic troubleshooting, consult a Jeep-certified technician for diagnostics and repairs.
