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Home >> Acura >> 2016 >> ILX >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Audio System - Symptom Troubleshooting (2 Of 2) (Except Hybrid) >> Symptom Troubleshooting >> Audio System - No sound is heard from all the speakers (display is normal) (Without Navigation with Touch Screen) (2019 2020 2021 2022)

Audio System - No sound is heard from all the speakers (display is normal) (Without Navigation with Touch Screen) (2019 2020 2021 2022)

No sound is heard from all the speakers (display is normal) 

NOTE: 

  1. Problem verification

    -1. Turn the vehicle to the ON mode.

    -2. Go into the System Diagnostic Mode, and use the speaker check mode .

    Did all speakers produce a tone?

    YES 

    Intermittent failure, the system is OK at this time. Check for loose connections at the audio unit and speakers. If the tone is weak or distorted, go to Audio system sound is weak or distorted (display is normal) troubleshooting .

    NO 

    The failure is duplicated, go to step 2.

  2. Fuse check

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Check the following fuse.

    Fuse No. B37

    Is the fuse OK?

    YES 

    Go to step 3.

    NO 

    Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. B37 fuse circuit.

  3. Open wire check (+B PREMIUM AMP line)

    -1. Disconnect the following connector.

    Stereo amplifier connector A (18P)

    -2. Measure the voltage between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      Stereo amplifier connector A (18P): disconnected
    Test circuit +B PREMIUM AMP
    Test point 1 Stereo amplifier connector A (18P) No. 3 (WHT)
    Test point 2 Body ground
    GHH461827Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The +B PREMIUM AMP wire is OK. Go to step 4.

    NO 

    Repair an open in the wire.

  4. Determine possible failure area (SWD+B line, others)

    -1. Disconnect the following connector.

    Stereo amplifier connector B (28P)

    -2. Turn the vehicle to the ON mode.

    -3. Measure the voltage between test points 1 and 2.

    Test condition Vehicle ON mode
      Stereo amplifier connector A (18P): disconnected
      Stereo amplifier connector B (28P): disconnected
    Test circuit SWD+B
    Test point 1 Stereo amplifier connector B (28P) No. 13 (WHT)
    Test point 2 Body ground
    GHH461828Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The SWD+B wire is OK. Go to step 7.

    NO 

    Go to step 5.

  5. Open wire check (SWD+B line)

    -1. Measure the voltage between test points 1 and 2.

    Test condition Vehicle ON mode
      Stereo amplifier connector A (18P): disconnected
      Stereo amplifier connector B (28P): disconnected
    Test circuit SWD+B
    Test point 1 Audio unit connector A (24P) No. 21 (WHT)
    Test point 2 Body ground
    GHH461829Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Repair an open in the wire.

    NO 

    The SWD+B wire is not open. Go to step 6.

  6. Shorted wire check (SWD+B line)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Disconnect the following connectors.

    NOTE:  Eject the disc before disconnecting the audio unit to prevent damaging the CD player's load mechanism.

    Audio unit connector A (24P)
    ANC/active sound control unit 20P connector
    CarPlay and Android Auto unit connector A (20P)

    -3. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      Stereo amplifier connector A (18P): disconnected
      Stereo amplifier connector B (28P): disconnected
      Audio unit connector A (24P): disconnected
      ANC/active sound control unit 20P connector: disconnected
      CarPlay and Android Auto unit connector A (20P): disconnected
    Test circuit SWD+B
    Test point 1 Audio unit connector A (24P) No. 21 (WHT)
    Test point 2 Body ground
    GHH461830Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the wire.

    NO 

    Replace the audio unit .

  7. Open wire check (GND line)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      Stereo amplifier connector A (18P): disconnected
      Stereo amplifier connector B (28P): disconnected
    Test circuit SWD+B
    Test point 1 Stereo amplifier connector A (18P) No. 1 (BLK)
    Test point 2 Body ground
    GHH461831Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The GND wire is OK. Go to step 8.

    NO 

    Repair an open in the wire or poor ground (G504).

  8. Shorted wire check (RS485+ line, RS485- line)

    -1. Disconnect the following connector.

    Audio unit connector C (20P)

    -2. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      Audio unit connector C (20P): disconnected
      Stereo amplifier connector A (18P): disconnected
      Stereo amplifier connector B (28P): disconnected
    Test circuit RS485+
    Test point 1 Audio unit connector C (20P) No. 5 (PNK)
    Test point 2 Body ground
    Test circuit RS485- 
    Test point 1 Audio unit connector C (20P) No. 4 (BLU)
    Test point 2 Body ground
    GHH461832Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    There is a short to body ground in the wire(s). Replace the affected shielded harness.

    NO 

    The RS485+ and the RS485-  wires are not shorted to ground. Go to step 9.

  9. Shorted wire check (RS485+ line to RS485- line)

    -1. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      Audio unit connector C (20P): disconnected
      Stereo amplifier connector A (18P): disconnected
      Stereo amplifier connector B (28P): disconnected
    Test circuit RS485+, RS485- 
    Test point 1 Audio unit connector C (20P) No. 5 (PNK)
    Test point 2 Audio unit connector C (20P) No. 4 (BLU)
    GHH461833Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    There is a short in the wires. Replace the affected shielded harness.

    NO 

    The RS485+ and the RS485-  wires are not shorted. Go to step 10.

  10. Shorted wire check (RE485 SH line to another lines)

    -1. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      Audio unit connector C (20P): disconnected
      Stereo amplifier connector A (18P): disconnected
      Stereo amplifier connector B (28P): disconnected
    Test circuit RE485 SH, RS485+
    Test point 1 Audio unit connector C (20P) No. 15 (GRY)
    Test point 2 Audio unit connector C (20P) No. 5 (PNK)
    Test circuit RE485 SH, RS485- 
    Test point 1 Audio unit connector C (20P) No. 15 (GRY)
    Test point 2 Audio unit connector C (20P) No. 4 (BLU)
    GHH461834Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    There is a short in the wires. Replace the affected shielded harness.

    NO 

    The RE485 SH wire is OK. Go to step 11.

  11. Open wire check (RS485+ line, RS485- line)

    -1. Check for continuity between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      Audio unit connector C (20P): disconnected
      Stereo amplifier connector A (18P): disconnected
      Stereo amplifier connector B (28P): disconnected
    Test circuit RS485+
    Test point 1 Audio unit connector C (20P) No. 5 (PNK)
    Test point 2 Stereo amplifier connector B (28P) No. 28 (PNK)
    Test circuit RS485- 
    Test point 1 Audio unit connector C (20P) No. 4 (BLU)
    Test point 2 Stereo amplifier connector B (28P) No. 14 (BLU)
    GHH461835Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The RS485+ and the RS485-  wires are OK. Go to step 12.

    NO 

    There is an open in the wire(s). Replace the affected shielded harness.

  12. Stereo amplifier check

    -1. Substitute a known-good stereo amplifier .

    -2. Reconnect all the connectors, and recheck.

    Does the symptom go away?

    YES 

    Replace the original stereo amplifier.

    NO 

    Replace the audio unit .

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