Code
C917
PEUGEOT
C — Chassis
Fault on the left-hand front audio output: Open circuit
AI status
Completed
Completed
100%
Causes
- Open or broken speaker wiring (intermittent or complete break)
- Disconnected or corroded speaker connector at speaker or harness
- Failed left-front speaker (open voice coil)
- Faulty amplifier/head unit output channel (open output stage)
- Blown inline fuse or fusible link feeding the amplifier
- Damage from water intrusion or prior repairs
Symptoms
- No audio from left-front speaker
- Reduced or unbalanced stereo image (sound appears to one side)
- Intermittent audio from left-front or drops out with door movement
- Audio system may log error or show message on infotainment display
- Click/pop on power-up from left-front area
What to check
- Visually inspect left-front speaker and connector for corrosion, water, or damage
- Check door-harness at door jamb for chafing or broken wires
- Verify speaker connector is fully seated at speaker and amplifier/head unit
- Check fuses related to audio amplifier and infotainment
- Scan vehicle for related network (CAN) or audio module fault codes
Signal parameters
- Speaker DC resistance with speaker connected: typically 2–8 ohms (measure across + and - at speaker connector) — expect continuity; open = OL
- With audio system powered and idle: some amplifiers show a DC bias (0–6 V) or floating output — consult service data
- With audio playing: AC voltage across the speaker outputs should be present (use AC multimeter or oscilloscope)
- Supply voltage to amplifier: nominal battery voltage ~11–14 V (verify supply and ground)
Diagnostic algorithm
- Read and record all related codes; clear codes and attempt to re-create the fault
- Visually inspect left-front speaker, connector, and door-harness for damage or corrosion
- Remove speaker and measure DC resistance across speaker terminals; expected 2–8 ohms. If open, replace speaker
- With speaker disconnected at amplifier end, measure continuity from amplifier output pins to speaker connector pins while moving the door — look for intermittent opens
- Check amplifier/head unit power and ground voltages and any inline fuses; replace any blown fuses
- Back-probe amplifier output with audio playing: verify AC audio signal appears; if no signal but other channels present, suspect amplifier channel failure
- Swap left and right speaker connections (or swap speakers) if practical: if fault follows speaker, speaker is bad; if fault stays on left channel, suspect amplifier/head unit or wiring
- Inspect connector pins for corrosion, bent pins, or poor contact; clean or repair as needed
- If amplifier suspected defective after above checks, confirm with oscilloscope or known-good amplifier/substitution per service manual, then replace or repair amplifier/module as required
- After repair, clear codes and verify proper operation and that code does not return
Likely causes
- Broken or pinched wire in door harness (common at hinge/door jamb)
- Speaker connector pushed out/corrosion at speaker or loom connector
- Speaker voice coil has failed (open resistance)
- Amplifier output stage has failed and presents open load to the controller
Fault status
Status
Open circuit detected on left-front audio output (no expected load/continuity on speaker channel).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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