Audio/AVN System: Troubleshooting: Sound

1. Ignition ON (H/U → B+, ACC Power on), H/U Power ON → Sound for Radio, Media, Navigation, Voice Guidance.
2. External amp is attached at the trunk. External amp communicates with H/U via CAN (Control Area Network) (* External amp location may vary)

1. Mute or irregular sound might occur if customer have changed sound settings (position, tone, bass, middle, treble) (This is normal, yet misdiagnosed)
2. Poor sound quality if low-quality soundtrack is played

   (Example: Application like I-MEPS will provide poor sound quality. Customers using BT stream to play I-MEPS claims H/U replacement for low sound quality)

1. Check vehicle modification (Front Panel, Black box, Mic, Taxi meter, etc.)

1. Check sound/noise output
2. Check H/U settings

1. Check defect of 1) H/U, 2) amp, 3) connector defect in order (Ext. amp spec)
2. Check defect of 1) H/U, 2) connector (For Internal amp)

1. Check defect by replacing H/U

1. Check H/U Setting

   (Internal/External amp)

1. Check H/U Setting (Internal/External amp)

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   1. Setting → Sound - Check position, tone settings
   2. Set position, tone to 'center'.

      →User may have changed settings to mute speakers

   3. Reset setting by pressing center button, then check sound

1. Check AMP (External amp)

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1. Review defect
   1. Check amp battery and ACC voltage (9V - 16V) → Vehicle issue if unable to read voltage
   2. Check audio output → Amp issue if no audio output - Check speaker impedance → If not normal, check wire/cable, speaker (disconnect the cable and test)

1. Check cable (External amp)

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1. AMP ↔ H/U Line inspection
   1. MMCAN +/-: Check open/short using multi-meter
   2. SPDIF +/-: Check open/short using multi-meter
   3. NAVI +/-: Check open/short using multi-meter

      →Issue occurs (=Open) -> Cable wiring issue

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1. Check cable connection to H/U, AMP and mid connector

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* Check amp connector (For external amp)

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* Check if mid connector is present and find location at the red mark

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* Check H/U connector

1. Check connection status of Part ↔ Connector
   1. Check noise by pulling cable a little
   2. Check for incorrect cable mounting

      →If issue continues, re-connect the cable and re-test

1. Check for cable defect (Internal/external amp)

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1. Review cable and connector defect
   1. Check inside terminal status
   2. Connector pin connection status
      1. Replace terminal if defect

1. Check H/U settings (Internal/External amp)

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   1. Go to setting -> Sound, check settings for Position, tone
   2. Position, tone center must be set in center.

      → No sound might occur if user changed sound setting ***

   3. Press Center button to reset settings, and check sound
   4. If issue still occurs after above test
      1. Inspect in order: H/U rear connector → Cable connection → Cable defect

1. Check H/U/amp/Cable
   1. Check H/U rear connector (Internal amp)

1. Check H/U defect (Internal amp)

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   1. H/U defect review: After disconnecting H/U, increase volume and check speaker output using multi-meter
      1. If voltage increases while increasing volume -> Not H/U issue -> Check cable and connector
      • A1: RL (Rear Left), A2: FL (Front Left), A3: FR (Front Right), A4: RR (Rear Right)
      • Refer to pin location - RL/FL/FR/RR pin location varies

1. H/U connection status

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   * Check H/U connector

   1. Check connection for Part ↔ Connector
      1. Duplicate issue by pulling cable
      2. Check misconnection

         → If issue duplicates, re-connect and check again

1. Check cable defect (Internal/external amp)

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   1. Review cable and connector defect
      1. Check inside terminal status
   2. Pin connection
      1. Replace terminal if defect