Adaptive Front Lighting System (AFS) Malfunction
There's a problem with the adaptive front lighting system.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The car's headlights are supposed to turn slightly when you steer to help you see around corners better, but there's a fault in this system.
What the computer is actually seeing
The body control module (BCM) is getting faulty feedback from the AFS sensors or actuators, indicating they aren't working as intended (e.g., sensor voltage too high/low or not changing when needed).
What a healthy reading looks like
Sensor voltage should be between 0.5 to 4.5 volts; expected response time for headlight adjustment should be less than 200 milliseconds.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the wiring and connectors for the AFS sensors; look for damaged, corroded, or loose connections. Decision Point: Are all connections secure and undamaged? (Yes: proceed to step 2; No: repair/reconnect as necessary.)
- 22. Measure the voltage at the AFS sensor using a multimeter. Expected voltage should be between 0.5 to 4.5 volts. Decision Point: Is the voltage within the expected range? (Yes: proceed to step 3; No: replace the faulty sensor.)
- 33. Inspect the body control module for any fault codes or issues separately. Decision Point: Does the BCM show other fault codes or issues? (Yes: address BCM faults; No: further investigate AFS actuators.)
Common causes
- Faulty AFS sensors
- Wiring issues or connectors corroded
- Faulty body control module (BCM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it's typically safe to drive, but the headlights won't adjust properly, making night driving more difficult.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code pair with others like B2417?
These codes are often linked as they all relate to the AFS system; a fault in one component can affect others.
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