Audio - Poor or no sound with AM/FM radio(KA, KC models with Navigation) (2016 2017 2018 2019 2020 2021 2022)

Poor or no sound with AM/FM radio 

NOTE: 

• Check the vehicle battery condition first .
• Check for aftermarket accessories plugged into the vehicle accessory power sockets.
• Check for any radio frequency modulators that are plugged into the FM antenna lead. These modulators allow clients to play audio from accessories like CD players or game consoles using the audio system, but they can create interference issues.
• Check the radio reception in an open area. Compare it to a known-good vehicle whenever possible. Poor reception/interference can be caused by the following:
• • -

    The radio station is far away

  • -

    Atmospheric conditions are unfavorable

  • -

    Tall buildings, mountains, or high-voltage power lines are nearby

  • -

    Electrical loads like the rear window defroster, seat heaters, game consoles, etc.

• Check the connectors for poor connections or loose terminals.

1. Problem verification

   -1. Park the vehicle in an open area.

   -2. Press the engine start/stop button to select the ON mode.

   -3. Turn on the audio system, and select AM or FM radio station.

   Is the sound quality normal?

   YES 

   Intermittent failure, the system is OK at this time.

   NO 

   The failure is duplicated, go to step 2.

2. Reception/interference check

   -1. Check if the radio reception/interference is the same as the known-good vehicle in several locations.

   Is the AM or FM sound quality the same?

   YES 

   Multipath interference or weak station. Operation is normal.

   NO 

   Go to step 3.

3. Seek stop test

   -1. Do the Seek Stop Test in the Sound Quality Diagnosis .

   Is the test vehicle within 10 % of the known-good vehicle?

   YES 

   Go to step 11.

   NO 

   Go to step 4.

4. Determine possible failure area (SWD +B line, AM/FM line)

   -1. Press the engine start/stop button to select the OFF mode.

   -2. Disconnect the following connector.

   AM/FM/XM/TEL/GPS antenna connector A (3P)

   -3. Press the engine start/stop button to select the ON mode.

   -4. Turn on the audio unit.

   -5. Measure the voltage between test points 1 and 2.

   Test condition	ON mode
   	AM/FM/XM/TEL/GPS antenna connector A (3P): disconnected
   Test circuit	SWD +B
   Test point 1	AM/FM/XM/TEL/GPS antenna connector A (3P) No. 1
   Test point 2	Body ground

   Courtesy 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. Shorted wire check (SWD +B line)

   -1. Press the engine start/stop button to select the OFF mode.

   -2. Disconnect the following connector.

   Tuner unit connector B (5P)

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

   Test condition	OFF mode
   	AM/FM/XM/TEL/GPS antenna connector A (3P): disconnected
   	Tuner unit connector B (5P): disconnected
   Test circuit	SWD +B
   Test point 1	AM/FM/XM/TEL/GPS antenna connector A (3P) No. 1
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Repair a short to body ground in the wire between the tuner unit and the AM/FM/XM/TEL/GPS antenna.

   NO 

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

6. Open wire check (SWD +B line)

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

   Test condition	OFF mode
   	AM/FM/XM/TEL/GPS antenna connector A (3P): disconnected
   	Tuner unit connector B (5P): disconnected
   Test circuit	SWD +B
   Test point 1	Tuner unit connector B (5P) No. 1
   Test point 2	AM/FM/XM/TEL/GPS antenna connector A (3P) No. 1

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Replace the tuner unit .

   NO 

   Repair an open in the wire between the tuner unit and the AM/FM/XM/TEL/GPS antenna.

7. Shorted wire check (AM/FM line)

   -1. Press the engine start/stop button to select the OFF mode.

   -2. Disconnect the following connector.

   Tuner unit connector B (5P)

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

   Test condition	OFF mode
   	AM/FM/XM/TEL/GPS antenna connector A (3P): disconnected
   	Tuner unit connector B (5P): disconnected
   Test circuit	AM/FM
   Test point 1	Tuner unit connector B (5P) No. 2
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Replace the antenna rear lead.

   NO 

   The AM/FM wire is not shorted to ground. Go to step 8.

8. Shorted wire check (AM/FM line to SH (AM/FM) line)

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

   Test condition	OFF mode
   	AM/FM/XM/TEL/GPS antenna connector A (3P): disconnected
   	Tuner unit connector B (5P): disconnected
   Test circuit	AM/FM, SH (AM/FM)
   Test point 1	Tuner unit connector B (5P) No. 2
   Test point 2	Tuner unit connector B (5P) No. 4 (BLK)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Replace the antenna rear lead.

   NO 

   The AM/FM wire is not shorted to SH(AM/FM) wire. Go to step 9.

9. Open wire check (AM/FM line)

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

   Test condition	OFF mode
   	AM/FM/XM/TEL/GPS antenna connector A (3P): disconnected
   	Tuner unit connector B (5P): disconnected
   Test circuit	AM/FM
   Test point 1	Tuner unit connector B (5P) No. 2
   Test point 2	AM/FM/XM/TEL/GPS antenna connector A (3P) No. 2

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The AM/FM wire is OK. Go to step 10.

   NO 

   Replace the antenna rear lead.

10. AM/FM antenna check (substitution)

    -1. Substitute a known-good AM/FM/XM/TEL/GPS antenna .

    -2. Reconnect all the connectors, and recheck.

    Does the symptom go away?

    YES 

    Replace the original AM/FM/XM/TEL/GPS antenna.

    NO 

    Replace the tuner unit .

11. Shorted wire check (TUN AUDIO lines) 1

    -1. Press the engine start/stop button to select the OFF mode.

    -2. Disconnect the following connectors.

    Audio-navigation unit connector E (5P)

    Tuner unit connector A (20P)

    -3. Check for continuity between these test points and body ground individually.

    Test condition	OFF mode
    	Audio-navigation unit connector E (5P): disconnected
    	Tuner unit connector A (20P): disconnected

    Connector	Test circuit	Terminal
    Tuner unit connector A (20P)	TUN AUDIO L-	No. 3 (WHT)
    	TUN AUDIO R-	No. 4 (RED)
    	TUN AUDIO L+	No. 13 (GRN)
    	TUN AUDIO R+	No. 14 (BLK)

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    There is a short to body ground in the wire(s) between the audio-navigation unit and the tuner unit. Replace the affected shielded harness.

    NO 

    The TUN AUDIO wires are not shorted to ground. Go to step 12.

12. Shorted wire check (TUN AUDIO lines) 2

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

    Test condition	OFF mode
    	Audio-navigation unit connector E (5P): disconnected
    	Tuner unit connector A (20P): disconnected

    Test circuits	Connector: Tuner unit connector A (20P)
    	Test point 1	Test points 2
    TUN AUDIO L- to TUN AUDIO R-, TUN AUDIO SH, TUN AUDIO L+, TUN AUDIO R+	No. 3 (WHT)	No. 4 (RED), No. 5 (GRY), No. 13 (GRN), No. 14 (BLK)
    TUN AUDIO R- to TUN AUDIO SH, TUN AUDIO L+, TUN AUDIO R+	No. 4 (RED)	No. 5 (GRY), No. 13 (GRN), No. 14 (BLK)
    TUN AUDIO SH to TUN AUDIO L+, TUN AUDIO R+	No. 5 (GRY)	No. 13 (GRN), No. 14 (BLK)
    TUN AUDIO L+ to TUN AUDIO R+	No. 13 (GRN)	No. 14 (BLK)

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity between any of the terminals?

    YES 

    There is a short in the wires between the audio-navigation unit and the tuner unit. Replace the affected shielded harness.

    NO 

    The TUN AUDIO wires are not shorted in the wires. Go to step 13.

13. Open wire check (TUN AUDIO lines)

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

    Test condition	OFF mode
    	Audio-navigation unit connector E (5P): disconnected
    	Tuner unit connector A (20P): disconnected

    Test circuit	Test point 1:Tuner unit connector A (20P)	Test point 2:Audio-navigation unit connector E (5P)
    TUN AUDIO L-	No. 3 (WHT)	No. 2 (WHT)
    TUN AUDIO R-	No. 4 (RED)	No. 4 (RED)
    TUN AUDIO L+	No. 13 (GRN)	No. 3 (GRN)
    TUN AUDIO R+	No. 14 (BLK)	No. 5 (BLK)

    Courtesy of HONDA, U.S.A., INC.

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The TUN AUDIO wires are OK. Go to step 14.

    NO 

    There is an open in the wire(s) between the audio-navigation unit and the tuner unit. Replace the affected shielded harness.

14. Tuner unit check (substitution)

    -1. Substitute a known-good tuner unit .

    -2. Reconnect all the connectors, and recheck.

    Does the symptom go away?

    YES 

    Replace the original tuner unit.

    NO 

    Replace the audio-navigation unit .