Code
B2945
HYUNDAI
B — Body
RL Speaker Connection Error
Views:
UK: 14
EN: 16
RU: 14
AI status
Completed
Completed
100%
Causes
- Open or short in RL speaker wiring (harness, connector, or splice).
- Corroded or loose speaker connector at the speaker or amplifier/head unit.
- Failed RL speaker (voice coil open, shorted, or damaged).
- Faulty amplifier or head unit audio output channel.
- Blown audio-related fuse or damaged power/ground to amplifier.
- Water intrusion or physical damage in door/trunk area affecting wiring.
Symptoms
- No sound from rear left speaker or very low/ distorted audio.
- Intermittent audio from the RL position that changes when doors move or harness is manipulated.
- Related audio warning or message on infotainment display.
- Possible NVH (buzzing, rattling) from RL speaker area.
- Diagnostic trouble code B2945 stored; other audio-related codes may accompany it.
What to check
- Scan system with an OEM-capable scan tool to confirm B2945 and read freeze frame/related codes.
- Visual inspection of RL speaker, connector, and wiring for damage, corrosion or water.
- Wiggle test harness and connectors while audio is playing to check for intermittent behavior.
- Check audio/amplifier fuses and power/ground connections.
- Measure speaker resistance at the speaker leads with multimeter (engine off).
- Check amplifier/head unit outputs for AC audio signal with known-good source or scope.
Signal parameters
- Speaker DC resistance (cold): typically 2–8 ohms for common car speakers; infinite or very high indicates open circuit.
- AC audio output: audible sine or music waveform present on amplifier output when playing test tone.
- No large DC offset on amplifier speaker output with system powered (large DC indicates output stage fault).
- Continuity from speaker connector back to amplifier/head unit without short to chassis ground or battery.
Diagnostic algorithm
- Use a scan tool to confirm B2945 and check for related codes (other speaker channels, amplifier, CAN/BUS).
- Reproduce symptom: play a known test tone or music and verify RL speaker behavior.
- Inspect RL speaker and connector for water, corrosion, loose pins, or physical damage; repair connector as needed.
- With connectors disconnected, measure speaker DC resistance at the speaker terminals. If open/high resistance, replace speaker.
- Backprobe amplifier/head unit RL output connector and measure for AC audio signal while playing a test tone. No signal suggests amplifier/head unit fault or wiring open.
- Check for shorts: measure continuity from RL (+) and (−) conductors to chassis ground and to battery positive. Shorts to battery or ground indicate wiring fault.
- Wiggle harness between amplifier/head unit and speaker while monitoring signal to locate intermittent breaks (common at door hinge or trunk lid harness).
- Verify amplifier/head unit power and ground voltages and related fuses/relays. Repair any power/ground issues.
- If wiring and speaker are good but no proper output, consider amplifier or head unit replacement or repair. Follow OEM procedures for module replacement and programming.
- Clear codes, retest system, and verify no return of B2945 and that audio function is restored.
Likely causes
- Damaged speaker wiring where it passes through a hinge or panel.
- Speaker connector pins corroded or pushed out of terminal.
- Speaker voice coil open (high/infinite resistance) or shorted to chassis.
- Amplifier output stage failed (no output or DC offset).
- Ground or power circuit to amplifier/head unit intermittent or missing.
Fault status
Status
Rear-left speaker circuit abnormal — open, short, high resistance, or poor connection detected by audio module/amplifier.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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