Audio/Video/Navigation (AVN) System: Troubleshooting: Sound

Features/Misdiagnose cases

Inspection	Description
(1) System features	Ignition ON (H/U → B+, ACC Power on), H/U Power ON → Sound for Radio, Media, Navigation, Voice Guidance. External amp is attached at the trunk. External amp communicates with H/U via CAN (Control Area Network) (*External amp location may vary)
(2) Misdiagnose cases	Mute or irregular sound might occur if customer have changed sound settings (position, tone, bass, middle, treble) (This is normal, yet misdiagnosed) 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)

Sound output - Common

Inspection	Description
(1) Vehicle modification	Check vehicle modification (Front Panel, Black box, Mic, Taxi meter, etc.)
(2) Duplicate issue	Check sound/noise output Check H/U settings
(3) Check H/U/Amp/Cable	Check defect of 1) H/U, 2) amp, 3) connector defect in order (Ext. amp spec) Check defect of 1) H/U, 2) connector (For Internal amp)
(4) Defect caused by Ext. parts	N/A
(5) Check part defect	Check defect by replacing H/U

Sound Output_Noise (H/U_Ext. Amp)

Inspection Procedure	Description
(1) Duplicate issue 1. Check H/U Setting (Internal/External amp)	Check H/U Setting (Internal/External amp) Fig 1: Checking H/U Setting (Internal/External AMP) Courtesy of KIA MOTORS AMERICA, INC. Setting → Sound - Check position, tone settings Set position, tone to 'center'. →User may have changed settings to mute speakers Reset setting by pressing center button, then check sound

Sound Output_Noise (External AMP_Cable)

Inspection Procedure	Description
(2) Inspect H/U/AMP/Cable 1. AMP (External AMP)	Check AMP (External amp) Fig 2: Checking AMP (External AMP) Courtesy of KIA MOTORS AMERICA, INC. Review defect Check amp battery and ACC voltage (9V - 16V) → Vehicle issue if unable to read voltage Check audio output → Amp issue if no audio output - Check speaker impedance → If not normal, check wire/cable, speaker (disconnect the cable and test)
(2) Inspect H/U/AMP/Cable 2. Cable (External amp)	Check cable (External amp) Fig 3: Checking External AMP Cable Connector Pins Courtesy of KIA MOTORS AMERICA, INC. AMP ↔ H/U Line inspection MMCAN +/-: Check open/short using multi-meter SPDIF +/-: Check open/short using multi-meter NAVI +/-: Check open/short using multi-meter →Issue occurs (=Open) -> Cable wiring issue Courtesy of KIA MOTORS AMERICA, INC.KIA MOTORS AMERICA, INC.
(2) Check cable connection 3. Cable connection (Internal/External amp)	Check cable connection to H/U, AMP and mid connector Fig 4: Checking Cable Connection To H/U, AMP And Mid Connector Courtesy of KIA MOTORS AMERICA, INC. * Check amp connector (For external amp) Fig 5: Checking AMP Connector (For External AMP) Courtesy of KIA MOTORS AMERICA, INC. * Check if mid connector is present and find location at the red mark Fig 6: Checking Mid Connector Courtesy of KIA MOTORS AMERICA, INC. * Check H/U connector Check connection status of Part ↔ Connector Check noise by pulling cable a little Check for incorrect cable mounting →If issue continues, re-connect the cable and re-test
(2) Check H/U/AMP/Cable 4. Check for cable defect (Internal/External amp)	Check for cable defect (Internal/external amp) Fig 7: Checking For Cable Defect - Internal/External AMP (1 Of 2) Courtesy of KIA MOTORS AMERICA, INC. Fig 8: Checking For Cable Defect - Internal/External AMP (2 Of 2) Courtesy of KIA MOTORS AMERICA, INC. Review cable and connector defect Check inside terminal status Connector pin connection status Replace terminal if defect

Sound Output_Noise (H/U_Internal amp spec)

Inspection Procedure	Description
(1) Check problem 1. Check H/U settings (Internal/External amp)	Check H/U settings (Internal/External amp) Fig 9: Checking H/U Settings (Internal/External AMP) Courtesy of KIA MOTORS AMERICA, INC. Go to setting -> Sound, check settings for Position, tone Position, tone center must be set in center. → No sound might occur if user changed sound setting *** Press Center button to reset settings, and check sound If issue still occurs after above test Inspect in order: H/U rear connector → Cable connection → Cable defect
(2) Check H/U/amp/Cable 1. Check H/U rear connector (Internal amp)	Check H/U defect (Internal amp) Fig 10: Checking H/U Defect (Internal AMP) Courtesy of KIA MOTORS AMERICA, INC. H/U defect review: After disconnecting H/U, increase volume and check speaker output using multi-meter 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
Check cable connection 2. Cable connection (Internal/External amp)	H/U connection status Fig 11: Checking H/U Cable Connection Courtesy of KIA MOTORS AMERICA, INC. * Check H/U connector Check connection for Part ↔ Connector Duplicate issue by pulling cable Check misconnection →If issue duplicates, re-connect and check again
(2) Check H/U/Amp/Cable 3. Cable defect (Internal/External amp)	Check cable defect (Internal/external amp) Fig 12: Checking Cable Defect - Internal/External AMP (1 Of 2) Courtesy of KIA MOTORS AMERICA, INC. Fig 13: Checking Cable Defect - Internal/External AMP (2 Of 2) Courtesy of KIA MOTORS AMERICA, INC. Review cable and connector defect Check inside terminal status Pin connection Replace terminal if defect