Audio System Symptom Troubleshooting - Poor or no sound with AM/FM radio
Poor or no sound with AM/FM radio
NOTE:
Check the vehicle 12 volt 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 customers 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
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Electrical loads like the rear window defroster, seat heaters, game consoles, etc.
Check the connectors for poor connections or loose terminals.
1.
Problem verification:

Problem verification
?1.
Park the vehicle in an open area.

?2.
Turn the vehicle to 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:

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:

Seek stop test
?1.
Select the SCAN to check if the number of received radio station are the same as the known-good vehicle.

Are the number of radio station the same?

     
YES
     
     
     
Go to step 11.
     
NO
     
     
     
Go to step 4.
4.
Determine possible failure area (ANT +B line, others):

Determine possible failure area (ANT +B line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Roof antenna connector A (3P)

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Roof antenna connector A (3P): disconnected
Test point 1
Roof antenna connector A (3P) No. 1
Test point 2
Body ground


Is there about 9.0 V?

     
YES
     
     
     
The ANT +B wire is OK. Go to step 7.
     
NO
     
     
     
Go to step 5.
5.
Shorted wire check (ANT +B line):

Shorted wire check (ANT +B line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Tuner unit connector C (5P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Roof antenna connector A (3P): disconnected
 
Tuner unit connector C (5P): disconnected
Test point 1
Roof antenna connector A (3P) No. 1
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short to body ground in the wire between the roof antenna and the tuner unit.?
     
NO
     
     
     
The ANT +B wire is not shorted to ground. Go to step 6.
6.
Open wire check (ANT +B line):

Open wire check (ANT +B line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Roof antenna connector A (3P): disconnected
 
Tuner unit connector C (5P): disconnected
Test point 1
Tuner unit connector C (5P) No. 1
Test point 2
Roof antenna connector A (3P) No. 1


Is there continuity?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the wire between the roof antenna and the tuner unit.?
7.
Shorted wire check (RF IN line):

Shorted wire check (RF IN line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Tuner unit connector C (5P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Roof antenna connector A (3P): disconnected
 
Tuner unit connector C (5P): disconnected
Test point 1
Roof antenna connector A (3P) No. 2
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
There is a short to body ground in the wire between the roof antenna and the tuner unit. Replace the affected antenna lead.?
     
NO
     
     
     
The RF IN wire is not shorted to ground. Go to step 8.
8.
Shorted wire check (RF IN line to SH (RF IN) line):

Shorted wire check (RF IN line to SH (RF IN) line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Roof antenna connector A (3P): disconnected
 
Tuner unit connector C (5P): disconnected
Test point 1
Roof antenna connector A (3P) No. 2
Test point 2
Roof antenna connector A (3P) No. 3


Is there continuity?

     
YES
     
     
     
There is a short in the wire between the roof antenna and the tuner unit. Replace the affected antenna lead.?
     
NO
     
     
     
The RF IN wire is not shorted to SH(RF IN) wire. Go to step 9.
9.
Open wire check (RF IN line):

Open wire check (RF IN line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Roof antenna connector A (3P): disconnected
 
Tuner unit connector C (5P): disconnected
Test point 1
Roof antenna connector A (3P) No. 2
Test point 2
Tuner unit connector C (5P) No. 2


Is there continuity?

     
YES
     
     
     
The RF IN wire is OK. Go to step 10.
     
NO
     
     
     
There is an open in the wire between the roof antenna and the tuner unit. Replace the affected antenna lead.?
10.
Roof antenna check (substitution):

Roof antenna check (substitution)
?1.
Substitute a known-good roof antenna.

?2.
Reconnect all the connectors, and recheck.

Does the symptom go away?

     
YES
     
     
     
Replace the original roof antenna.?
     
NO
     
     
     
11.
Shorted wire check (SPDIF1 line):

Shorted wire check (SPDIF1 line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Audio-navigation unit connector L (2P) (with navigation)
Audio unit connector L (2P) (without navigation)
Tuner unit connector B (2P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector L (2P) (with navigation): disconnected
 
Audio unit connector L (2P) (without navigation): disconnected
 
Tuner unit connector B (2P): disconnected
Test point 1
Tuner unit connector B (2P) No. 1
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
There is a short to body ground in the wire between the audio-navigation unit or the audio unit and the tuner unit. Replace the affected shielded harness.?
     
NO
     
     
     
The SPDIF1 wire is not shorted to ground. Go to step 12.
12.
Shorted wire check (SPDIF1 line to SH(SPDIF1) line):

Shorted wire check (SPDIF1 line to SH(SPDIF1) line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector L (2P) (with navigation): disconnected
 
Audio unit connector L (2P) (without navigation): disconnected
 
Tuner unit connector B (2P): disconnected
Test point 1
Tuner unit connector B (2P) No. 1
Test point 2
Tuner unit connector B (2P) No. 2

Is there continuity?

     
YES
     
     
     
There is a short in the wires between the audio-navigation unit or the audio unit and the tuner unit. Replace the affected shielded harness.?
     
NO
     
     
     
The SPDIF1 and the SH(SPDIF1) wires are not shorted. Go to step 13.
13.
Open wire check (SPDIF1 line, SH(SPDIF1) line):

Open wire check (SPDIF1 line, SH(SPDIF1) line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector L (2P) (with navigation): disconnected
 
Audio unit connector L (2P) (without navigation): disconnected
 
Tuner unit connector B (2P): disconnected
Test point 1
Audio-navigation unit connector L (2P) (with navigation) No. 1
Audio unit connector L (2P) (without navigation) No. 1
Test point 2
Tuner unit connector B (2P) No. 1


Is there continuity?

     
YES
     
     
     
The SPDIF1 and the SH(SPDIF1) wires are OK. Go to step 14.
     
NO
     
     
     
There is an open in the wire(s) between the audio-navigation unit or the audio unit and the tuner unit. Replace the affected shielded harness.?
14.
Tuner unit check (substitution):

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: With navigation
     
     
     
     
NO: Without navigation