OBD-II Body Error Code B0689: How to Fix It

Q: Can I drive safely with OBD-II code B0689?

Yes, B0689 is not a safety-critical error and won't affect your ability to drive. However, your auto-dimming mirror may not function properly, which could cause glare from vehicles behind you during night driving.

Q: How much does it cost to fix B0689 error code?

Repair costs vary widely depending on the root cause. A simple fuse replacement costs under $10, while a new auto-dimming mirror assembly can range from $200-600 plus labor. Most issues are resolved with basic electrical repairs costing $100-300.

Q: What causes the auto-dimming mirror to stop working?

Common causes include blown fuses, corroded wiring connections, faulty ambient light sensors, damaged mirror electronics, or issues with the body control module. Age and moisture intrusion are frequent culprits.

Q: Will disconnecting the battery fix B0689?

Disconnecting the battery may temporarily clear the code, but it won't fix the underlying problem. The code will likely return unless the actual fault in the auto-dim mirror circuit is repaired.

Q: Is B0689 related to other mirror problems?

B0689 specifically affects the auto-dimming function feedback circuit. However, it may appear alongside other mirror-related codes if there are broader electrical issues affecting the mirror assembly or body control module.

Abstract

OBD-II error code B0689 indicates a problem with the auto-dimming rearview mirror feedback circuit. This error occurs when the mirror's automatic dimming feature cannot properly communicate with the vehicle's electrical system. While not a safety-critical issue, it can affect your mirror's ability to reduce glare from headlights behind you.