Code
C1161
ALFA ROMEO
C — Chassis
Brake switch
Views:
UK: 18
EN: 19
RU: 16
AI status
Completed
Completed
100%
Causes
- Faulty brake light / brake pedal switch (mechanical or electrical failure)
- Incorrect switch adjustment or misalignment
- Damaged wiring harness (open, short to ground or battery, chafe)
- Corroded or loose connector pins at switch or module
- Blown fuse or poor ground in associated circuit
- Intermittent contact due to contamination, broken spring or plunger
Symptoms
- Brake/ABS/ESP warning lamp illuminated
- Cruise control disabled or unavailable
- Brake lights not working or permanently on
- Hesitation or faults in systems relying on brake switch (hill-hold, start-in-gear interlock, stop/start)
- Stored C1161 code and possible related fault codes
- Intermittent faults that change with pedal movement or connector manipulation
What to check
- Connect a compatible scan tool; read freeze frame and live data for brake switch state while pressing/releasing pedal
- Visually inspect brake switch and connector for damage, corrosion, bent pins or loose mounting
- Confirm brake lights operate correctly when pedal is pressed
- With key on (engine off) monitor brake switch signal voltage at the switch connector and at the module harness (if accessible)
- Check continuity/resistance across switch terminals while actuating the pedal; check for short to battery or ground
- Check relevant fuses and ground points
Signal parameters
- Brake switch is a two-state (on/off) digital signal: expected near battery voltage (approx. 11–14 V) in one state and close to 0 V in the other, depending on circuit configuration
- Closed-contact resistance: near 0 Ω when switch is actuated (closed)
- Open-circuit: infinite resistance when released
- Switch should change state immediately on pedal travel (milliseconds); no slow or flaky transitions
Diagnostic algorithm
- Record stored codes and freeze-frame data with a scan tool. Note related faults. 2. Verify symptom: check brake lights while an assistant depresses the pedal. 3. Inspect switch mounting and alignment; ensure plunger actuates fully and returns freely. 4. Disconnect switch connector; check terminal condition and measure reference voltage on the supply terminal with key on. 5. Measure switch continuity while operating pedal — replace switch if it fails to change state reliably. 6. Back-probe the signal circuit at the module (if accessible) and compare to switch-side readings to isolate wiring harness faults. 7. Repair/replace damaged wiring, connectors, or fuse/ground as required. 8. If wiring and switch are good, test or reprogram/replace control module per manufacturer procedure. 9. Clear codes and road-test to confirm repair.
- similar_codes:[
Likely causes
- Worn or failed brake pedal switch
- Connector corrosion or loose terminal at the switch
- Damaged wiring between switch and ABS/BCM
Fault status
Status
Brake switch circuit malfunction detected. The control module is receiving an implausible or missing brake switch signal. Causes include failed switch, wiring/connector problem, or module input fault. System functions depending on the brake switch (ABS/ESP, cruise, brake lights) may be degraded.
Repair difficulty: Medium
Diagnostic time: 0.5-1.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email