Friction Brake Switch Circuit Problem
There’s a fault with the circuit related to the friction brake switch.
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 friction brake switch tells the computer when you're pressing the brake pedal. If this circuit has a problem, it can't tell if you're braking or not, affecting safety features.
What the computer is actually seeing
The brake switch circuit should show 12V when the brake pedal is pressed and around 0V when released. An open circuit or voltage drop indicates a fault.
What a healthy reading looks like
12V when pressed, 0V when released, resistance should be near 0 ohms when closed (pedal pressed).
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. Inspect wiring and connectors for damage or corrosion; repair if necessary and test the circuit.
- 22. Measure voltage at the brake switch with the pedal released; it should show 0V. If not, replace the switch.
- 33. Press the brake pedal and check voltage at the brake switch; it should read 12V. No voltage indicates a wiring issue.
- 44. If wiring is intact, replace the brake switch and retest.
- 55. Clear the code and test drive the vehicle; if the code returns, investigate the brake controller.
Common causes
- Faulty brake switch
- Broken or shorted wiring
- Bad connectors
- Faulty brake controller
Typical repair cost
$$ ($200 - $500)
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended since the brake signal may malfunction, affecting safety features like ABS.
Will this code come back after clearing?
It can return if the underlying issue isn't fixed, especially if there's a wiring problem or a faulty switch.
Why does this code sometimes pair with other codes?
Other codes may indicate related systems that depend on brake signals, like traction control or ABS.
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