Code
C924
PEUGEOT
C — Chassis
Fault between the HiFi amplifier and the radio: Open circuit
Views:
UK: 6
EN: 10
RU: 5
AI status
Completed
Completed
100%
Causes
- Broken or pinched wiring between radio and amplifier
- Disconnected or corroded connector pins at radio or amplifier
- Blown fuse or faulty power/ignition feed to amplifier or radio
- Damaged amplifier or radio (internal open circuit)
- Poor ground connection
- Water ingress or mechanical damage to connectors/wiring
Symptoms
- No sound or partial sound from speakers
- Some speakers silent while others work
- No amplifier detected by radio / amplifier not listed in menus
- Audio warnings or error message on dash or infotainment screen
- Intermittent audio loss or audio returning after moving connectors
What to check
- Visually inspect connectors at radio and amplifier for corrosion, bent pins, or disconnection
- Check relevant fuses and relay(s) for radio/amplifier power and replace if blown
- Verify solid ground at amplifier and radio mounting points
- Scan for additional communication DTCs on audio or gateway modules
- Measure supply voltage and remote turn-on feed at amplifier and radio
- Perform continuity/ohm check on suspect signal and power wires between radio and amplifier
Signal parameters
- Amplifier supply voltage (vehicle on): ~11–14 V
- Remote turn-on/wake signal: 12 V present when radio on (if used)
- Ground continuity: near 0 Ω between module ground and vehicle chassis
- Speaker impedances: typical 2–8 Ω per channel (no short to ground)
- Communication bus idle voltages (if CAN used): ~2.5 V on each CAN line (varies by system)
- Continuity/low resistance between corresponding pins at radio and amplifier
Diagnostic algorithm
- Safety first: switch ignition off, disconnect battery if required by procedures.
- Visual inspection: check connectors and wiring for damage, corrosion, water ingress or loose pins at both radio and amplifier.
- Check fuses/relays: verify all fuses related to radio and amplifier are intact and supplying power.
- Power/ground verification: with ignition on, measure +12V supply and ground at amplifier and head unit; verify remote turn-on/wake signal is present when radio is on.
- Communication check: scan all modules for related bus faults (CAN/MOST/LIN). Note any additional U/C codes indicating broader bus problems.
- Continuity testing: perform resistance/continuity checks on the wiring between radio and amplifier pins for power, ground, audio lines and communication lines. Repair any open or high-resistance circuits.
- Connector service: clean and re-seat connectors; repair or replace corroded terminals or harness sections as needed.
- Functional test: clear stored codes, reconnect battery if disconnected, power up system and verify audio and module communication. Re-scan for DTCs.
- Module swap (if available): if wiring and supplies are good and fault persists, consider testing with known-good amplifier or head unit to isolate failed module.
- Finalize repairs: secure harness routing, protect against moisture, and re-check for return of the fault or intermittent behavior.
Likely causes
- Loose/disconnected connector at amplifier or radio
- Damaged wiring harness (open) between the two units
- Blown fuse or missing accessory power/remote turn-on feed
- Failed amplifier internal input stage or failed head unit output
Fault status
Status
Open circuit detected between HiFi amplifier and radio (communication/signal line interrupted).
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours (depends on access and extent of wiring repair)
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