The Adaptive Front-lighting System (AFS) in your Lexus enhances visibility by swiveling the headlights as you steer. However, sometimes you might need to turn AFS off or reset it due to malfunctions. This guide outlines common reasons for needing to deactivate or reset the AFS system and provides step-by-step instructions for a Lexus AFS reset.
Common Reasons for Lexus AFS Issues
Several issues can arise with the AFS system, requiring you to turn it off or reset it. These include a damaged or misaligned sensor, the installation of incorrect headlights (non-AFS or aftermarket), or simply a need for a system reset. Understanding the root cause is essential for effective troubleshooting. A blinking or illuminated AFS OFF indicator light on your dashboard usually signifies a problem.
Lexus AFS Reset Procedure
If you suspect a simple system malfunction, a reset might resolve the issue. Here’s a detailed procedure for resetting the AFS system in your Lexus:
Step 1: Initial Preparation
- Ensure the engine is running and the gear shift is in the “P” (Park) position.
- Locate the AFS OFF switch, typically located on the dashboard or steering column.
- Press the AFS OFF switch eight times at approximately one-second intervals. This cycles the system on and off four times each. The AFS OFF indicator light should then begin blinking twice per second, indicating readiness for initialization.
Step 2: AFS ECU Initialization
- Straighten the steering wheel to ensure the tires are pointing directly forward. Maintaining this position is crucial throughout the process.
- Press the AFS OFF switch twice (once ON and once OFF). The AFS OFF indicator light should stay lit for two seconds.
- Repeat this double-press procedure two more times, each within a 3 to 10-second window. The indicator light should remain lit for two seconds each time.
Step 3: Verification
- After the final double-press, observe the AFS OFF indicator light. Three seconds after it goes off, it will either stay off, come on, or blink, indicating the status of the reset.
Results:
- Off: Initialization started with the AFS OFF switch in the OFF position.
- On: Initialization started with the AFS OFF switch in the ON position.
- Blinking (twice per second): Initialization failed. Repeat Step 2 within 10 seconds. If 10 seconds elapse, the system will attempt automatic correction.
When to Seek Professional Help
If the AFS OFF light persists after multiple reset attempts, it’s advisable to consult a qualified Lexus technician. This may indicate a more serious problem, such as a faulty sensor or wiring issue, requiring professional diagnosis and repair. Ignoring persistent AFS problems could compromise your safety, especially during nighttime driving. A functioning AFS system significantly improves visibility and enhances safety. Don’t hesitate to seek professional assistance if necessary.
