#MODEL S HORN&LOCK PROBLEMS
- jyang554
- Jan 31
- 2 min read
The Issues
Auto-Lock on Drive Away Stopped Working:When driving away, the door handles would retract as usual, but the doors would not lock automatically. The only way to lock the doors was by manually tapping the lock icon on the touchscreen.
Unlock on Park Failed:Both the single-tap and double-tap unlock-on-park features stopped working. The doors remained locked even after parking.
Horn Button Not Working:The horn button on the steering wheel was completely unresponsive. Interestingly, I could still activate the horn using the Tesla app, which ruled out a total horn failure.
Troubleshooting Steps
I tried several common fixes, including:
Performing a scroll wheel reset (both with and without the brake pedal).
Powering the car off completely via the Safety & Security menu.
Unfortunately, none of these resolved the issues. With my next available service appointment scheduled for February (thanks to Tesla’s busy schedule), I decided to dig deeper on my own.
The Breakthrough
After some research, I came across a fuse map for the Model S frunk fuse box on Teslatap. According to the map, Fuse F142 is responsible for “Security Controls and Horns”. This seemed like a potential culprit since both the auto-lock/unlock functions and the horn were affected.
Here’s what I did:
Checked Fuse F142:Using a multimeter, I tested F142 for continuity and found it was intact. All other fuses also tested fine.
Reinserted Fuse F142:Even though the fuse wasn’t blown, I decided to pull it out and reinsert it after about 15 seconds. Upon doing so, I heard a series of clicks and whirs from underneath the car, which indicated the system was resetting.
Tested the Functions:To my delight, the horn button started working again, and the auto-lock/unlock features were fully restored. I took the car for a drive, and everything functioned as expected.
Conclusion
If you’re experiencing similar issues with your Tesla Model S (or potentially other models), it’s worth checking Fuse F142 in the frunk fuse box. Even if the fuse isn’t blown, simply removing and reinserting it can reset the system and resolve the problem. This quick fix saved me a trip to the service center and a potentially costly repair.
I’ll be canceling my service appointment unless something else pops up. Hopefully, this post helps someone else facing the same issues!
How to Locate the F142 Fuse
1. Open the Frunk
In the Model S, the F142 fuse is located inside the fuse box in the frunk (front trunk).
First, open the frunk and remove the bottom liner or cover. The liner is usually secured by clips or Velcro and can be gently pulled up to remove.
2. Locate the Fuse Box
The fuse box is typically located on the right or left side of the frunk, near the windshield.
It is a black rectangular box, often labeled with a diagram or chart indicating the fuse numbers and their functions.
3. Refer to the Fuse Box Diagram
Open the fuse box cover. The inside of the cover usually has a printed diagram showing the layout of the fuses.
Look for the position labeled F142. According to Tesla’s fuse layout, F142 is typically associated with "Security Controls and Horns."
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