AUDIO SYSTEM SOUND QUALITY DIAGNOSIS
Special Tools Required
Diagnostic CD 07AAZ-SDBA100
Use the following tests to check sound quality.
NOTE:
ο¬
ο¬
Before beginning the following tests, write down the bass, the treble, the
fader and the balance settings, and then set them to their center positions
for testing.
Always verify the customer's complaint, and compare it a known-good
vehicle of the same model and trim under the same conditions using the
same inputs (iPod, USB device, etc.). If the complaint is the same on the
known-good vehicle, it is a system characteristic.
LEFT/RIGHT CHANNEL ID
Do this test to confirm proper channel routing.
1. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio-navigation unit or the audio unit.
2. Play track No. 1 (left, both, right channel ID) at a normal, or slightly higher than normal, volume level.
3. The voice should be audible only from the channel or channels when indicated.
ο¬
If the channel ID is correct for each side, go to PHASE TEST.
ο¬
If the channel ID is not correct, check for:
ο‘
ο‘
ο‘
ο‘
ο‘
ο‘
Shorted speaker wire
Faulty audio-navigation unit or audio unit
Faulty stereo amplifier
Shorted speaker
Open in speaker wire
Loose pins or poor pin fit in the speaker circuit
PHASE TEST
Do this test to confirm proper speaker phasing.
1. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio-navigation unit or the audio unit.
2. Play track No. 2 (phase) at a normal, or slightly higher than normal, volume level.
3. The voice should sound centered and focused when it indicates it is in-phase.
4. The voice should sound diffused, and have less bass when it indicates it is out of phase.
ο¬
If the voice changes from in-phase to out of phase as indicated by the prompt, the phasing is
correct. Go to ELECTRICAL NOISE TEST.
ο¬
If the voice always sounds out of phase, phasing is not correct. Check for:
ο‘
ο‘
ο‘
ο‘
ο‘
ο‘
ο‘
Shorted speaker wire
Faulty audio-navigation unit or audio unit
Faulty stereo amplifier
Shorted speaker
Open in speaker wire
Loose pins or poor pin fit in the speaker circuit
Aftermarket audio components like amplifiers, speakers, etc.
ELECTRICAL NOISE TEST
Do this test to check for electrical noise being induced into the audio system.
NOTE:
Electrical noise may be caused by outside sources that cannot be handled by
the audio system. Make sure you remove any cell phones and/or turn off any
aftermarket devices before beginning this test.
1. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio-navigation unit or the audio unit.
2. Play track No. 4 (digital zero) at a normal, or slightly higher than normal, volume level.
3. Operate any electrical device that may create electrical noise in the audio system, including starting the
engine, operating the power door locks, turning on the rear window defroster, etc.
4. Play track No. 5 (near digital zero) at a normal, or slightly higher than normal, volume level.
5. Operate any electrical device that may create electrical noise in the audio system, including starting the
engine, operating the power door locks, turning on the rear window defroster, etc.
6. Play track No. 6 (SNR) at a normal, or slightly higher than normal, volume level.
7. Operate any electrical device that may create electrical noise in the audio system, including starting the
engine, operating the power door locks, turning on the rear window defroster, etc.
ο¬
If no abnormal noise is heard, go to INDIVIDUAL SPEAKER TEST.
ο¬
If the noise is present only during the SNR track, replace the audio-navigation unit or the audio
unit.
ο¬
If the noise is heard during the digital zero or near digital zero track, check for:
ο‘
ο‘
ο‘
ο‘
ο‘
ο‘
Poor ground for audio-navigation unit or audio unit, engine or battery cable
Pinched or shorted speaker wire
Faulty audio-navigation unit or audio unit
Faulty stereo amplifier
Aftermarket devices or aftermarket window tint
Other faulty components causing excessive electrical noise (ignition coils, alternator, door
lock actuators, etc.). Disconnect or remove any suspect components, and then replay the
tracks that were originally noisy. If the noise goes away, check the component and its circuit
INDIVIDUAL SPEAKER TEST
NOTE:
Check the vehicle for aftermarket speakers, amplifiers, etc. that may affect
sound quality.
Do this test to identify a faulty speaker.
1. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio-navigation unit or the audio unit.
2. Play track No. 30 (steady 300 Hz tone) at a normal, or slightly higher than normal, volume level.
3. Listen to each speaker for poor sound compared to the other speakers. Use the audio-navigation unit's or
the audio unit's fader and balance settings to help isolate the channel with the problem.
ο¬
If the sound quality produced by a specific speaker is poor, substitute it with a known-good
speaker. If substituting a known-good speaker solves the problem, the speaker should be replaced.
If the poor sound quality continues, go to Sound Balance Test.
ο¬
If the sound quality is OK, go to Sound Balance Test.
SOUND BALANCE TEST
Do this test to identify a faulty channel or speaker.
1. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio-navigation unit or the audio unit.
2. Confirm the bass and treble are set to the center positions.
3. Play track No. 3 (pink noise) at a normal, or slightly higher then normal, volume level.
4. A static type sound should be heard through all speakers.
5. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio-navigation unit or the audio unit
of a known-good vehicle.
6. Set the bass and treble to the center position.
7. Play track No. 3 (pink noise) all the same level as was played in step 3.
8. Compare the sounds made by the two vehicles.
ο¬
ο¬
ο¬
If the sounds made by the two vehicles are very similar, go to FREQUENCY SWEEP TEST.
If the sound does not have as much bass, check the subwoofer and its circuit.
If the sound does not have enough hiss, check the tweeters and their circuits.
FREQUENCY SWEEP
NOTE: If possible, have the customer demonstrate their complaint, and record the
conditions under which the complaint occurred. Try to reproduce the complaint
in a known-good vehicle.
Do this test to find rattles or reverberations that may cause a perception of poor sound quality.
1. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio-navigation unit or the audio unit.
2. Play track No. 13 (sweep from 500 Hz to 35 Hz) at a normal, or slightly higher than normal, volume
level.
3. Listen to each speaker for poor sound quality or reverberations caused by specific frequencies. Use the
voice-over to estimate the frequency that causes the vibration. Use the audio-navigation unit's or the audio
unit's fader and balance settings to help isolate the channel with the problem.
ο¬
If vibrations or poor sound quality are heard, go to step 4.
ο¬
If no vibrations or poor sound quality are heard, go to Sound Judging.
4. Choose the appropriate track from No. 14 to 25 (small range frequency sweep) or 26 to 53 (single
frequencies) to recreate the frequency that caused the poor sound quality or vibration located in step 3;
this aids in diagnosis of the cause.
NOTE:
When you get to the track that recreates the problem, select the repeat
function on the audio-navigation unit or the audio unit, this will help you
isolate the cause.
5. Replace or insulate the source of the vibrations or, if the speaker is the source of the poor sound quality,
substitute a known-good speaker and retest.
SOUND JUDGING
Do this test to compare overall sound quality, imaging, and dynamics between the customer's vehicle and a
known-good vehicle. Only use a vehicle of the same model and trim level for this test. If possible, have the
customer demonstrate the problem.
Make sure the vehicle is using only OEM speakers, amplifiers, etc.
1. In the customer vehicle, set the bass, treble, fader, and balance settings to the customer's normal settings
that were written down before beginning testing.
2. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio-navigation unit or the audio unit.
3. Play tracks No. 7 to 12 (sound quality, midland, dynamics, and imaging demonstration tracks) at a
normal, or slightly higher than normal, volume level. Write down the volume setting being used.
4. Listen to the areas of the track that stand out as being either very clear or poorer than other areas of the
track.
5. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio-navigation unit or the audio unit
of a known-good vehicle.
6. Play the tracks at the same volume level and the same bass, treble, balance, and fader settings as used in
step 3 in the customer's vehicle.
7. Listen to the same area of the track that stood out as being either very clear or poorer than other areas of
the track.
8. Compare the customer vehicle's sound quality results to the known-good vehicle's results.
ο¬
If the sound quality in the customer vehicle is comparable to the sound quality in the known-good
vehicle, then the customer's vehicle is operating as designed.
ο¬
If the sound quality is not comparable, check these items in order.
ο‘
Loose or improperly installed speakers or other hardware that may become excited by the
vibrations generated by the speakers
ο‘
Damaged speaker(s)
ο‘
ο‘
ο‘
Faulty audio-navigation unit or audio unit
Faulty stereo amplifier
Aftermarket accessories
SEEK STOP TEST
Do this test to check the performance of the audio-navigation unit's or the audio unit's AM and FM reception.
Refer to SYMPTOM TROUBLESHOOTING before continuing with this test:
ο¬
ο¬
ο¬
ο¬
Audio system sound is weak or distorted (display is normal)
No sound is heard from the speakers (display is normal) (with navigation)
No sound is heard from the speakers (display is normal) (without navigation, with stereo amplifier)
No sound is heard from the speakers (display is normal) (without navigation and stereo amplifier)
NOTE:
ο¬
ο¬
Aftermarket window tint, aftermarket theft-recovery devices and other
aftermarket accessories may reduce radio reception.
Changes in cloud cover and other atmosphere conditions will affect the
ability of the audio-navigation unit or the audio unit to receive radio
signals.
1. Park the customer's vehicle in an open area away from buildings or other obstructions.
2. Park a known-good vehicle (same year, model, and trim level) next to the customer's vehicle, facing the
same direction.
3. Start the engine in the customer's vehicle, and turn on the radio.
4. Set the FM receiver to 87.7 MHz.
5. Press the Seek + button and record the first station that the audio-navigation unit or the audio unit locks
onto.
6. Press the Seek + button repeatedly, and write down each station that the audio-navigation unit or the
audio unit locks onto until the station recorded in step 5 is reached again.
7. Set the AM receiver to 530 kHz.
8. Press the Seek + button, and record the first station that the audio-navigation unit or the audio unit locks
on to.
9. Press the Seek + button repeatedly, and write down each station that the audio-navigation unit or the
audio unit locks onto until the station recorded in step 8 is reached again.
10. Turn the ignition switch to LOCK (0).
11. Start the engine in the known-good vehicle, and then do steps 4 thru 10 on the known-good vehicle.
12. Compare the number of stations received in steps 6 and 9 in the customer's vehicle with the number of
stations received in the known-good vehicle.
ο¬
If the number of stations received is the same, or within 10 %, the audio-navigation unit's or the
audio unit's tuner performance is OK. The problem may be atmospheric conditions, multi path
interference, or other obstructions to the radio signal.
ο¬
If the customer's vehicle receives fewer stations by at least 10 %, go to POOR AM OR FM
RADIO RECEPTION OF INTERFERENCE TROUBLESHOOTING .
SYMPTOM TESTS
AUDIO DISC DOES NOT EJECT
Fig. 33: Audio System Symptom Troubleshooting Flowchart - Audio Disc Does Not Eject
Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE:
ο¬
ο¬
CHECK THE VEHICLE BATTERY CONDITION FIRST .
Disc labels should not be used in the audio unit. They may jam and
damage the player mechanism.
ο¬
Check the connectors for poor connections or loose terminals.
1. Problem verification:
ο‘
1. Turn the ignition switch to ON (II).
2. Check to see if the disc ejects correctly with no binding by pushing the EJECT button.
ο‘
Does the disc eject normally?
YES : Intermittent failure, the system is OK at this time.
2024 Honda CR-V Owner's Manual
2023 Honda CR-V Owner's Manual
2021 Honda CR-V Owner's Manual
2018 Honda CR-V Owner's Manual
2015 Honda CR-V Owner's Manual
