Audio System Symptom Troubleshooting - No sound is heard from all the speakers (display is normal)
No sound is heard from all the speakers (display is normal)
NOTE:
Check the vehicle 12 volt battery condition first.
Display audio type: If the center display unit displays an error message, follow the instructions.
Before doing this troubleshooting, go to Audio-navigation unit power will not turn on (No information display) troubleshooting.
Check the connectors for poor connections or loose terminals.
Check the fuses associated with the system, and check for a short in the related lines.
1.
Operation check:

Operation check
?1.
Turn the vehicle to the ON mode.

?2.
Check that the volume level is not set to the MIN level.

Is it at the MIN level?

     
YES
     
     
     
Raise the volume level, and recheck the function.?
     
NO: Display audio type
     
     
     
Go to step 2.
     
NO: Color audio type
     
     
     
Go to step 4.
2.
Audio system check:

Audio system check
?1.
Check if the center display unit keeps indicating audio mute indication.

Is audio mute indication displayed?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Go to step 4.
3.
Open wire check (ACC/IG1 WITH DIODE FMVSS line):

Open wire check (ACC/IG1 WITH DIODE FMVSS line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Audio-navigation unit connector A (24P) (with navigation)
Audio unit connector A (24P) (without navigation)

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Audio-navigation unit connector A (24P) (with navigation): disconnected
Audio unit connector A (24P) (without navigation): disconnected
Test point 1
Audio-navigation unit connector A (24P) (with navigation) No. 23
 
Audio unit connector A (24P) (without navigation) No. 23
Test point 2
Body ground

Is there battery voltage?

     
YES: With navigation
     
     
     
     
YES: Without navigation
     
     
     
     
NO
     
     
     
Repair an open in the wire.?
4.
Problem verification:

Problem verification
?1.
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. If the tone is weak or distorted, go to Audio system sound is weak or distorted (display is normal) troubleshooting.?
     
NO: With stereo amplifier
     
     
     
The failure is duplicated, go to step 5.
     
NO: Without stereo amplifier
     
     
     
The failure is duplicated, go to step 19.
5.
System Diagnostic Mode check:

System Diagnostic Mode check
?1.
Go into the System Diagnostic Mode, and use the System Links to check the AMP icon status.

Is the AMP icon green?

     
YES
     
     
     
Go to step 15.
     
NO
     
     
     
Go to step 6.
6.
Open wire check (?B AUDIO AMP line):

Open wire check (?B AUDIO 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 point 1
Stereo amplifier connector A (18P) No. 3
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The ?B AUDIO AMP wire is OK. Go to step 7.
     
NO
     
     
     
Repair an open in the wire.?
7.
Determine possible failure area (SWD?B line, others):

Determine possible failure area (SWD?B line, others)
?1.
Disconnect the following connector.
Stereo amplifier connector C (16P)

?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 C (16P): disconnected
Test point 1
Stereo amplifier connector C (16P) No. 14
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The SWD?B wire is OK. Go to step 10.
     
NO
     
     
     
Go to step 8.
8.
Open wire check (SWD?B line):

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 C (16P): disconnected
Test point 1
Audio-navigation unit connector A (24P) (with navigation) No. 21
 
Audio unit connector A (24P) (without navigation) No. 21
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
Repair an open in the wire.?
     
NO
     
     
     
The SWD?B wire is not open. Go to step 9.
9.
Shorted wire check (SWD?B line):

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

?2.
Disconnect the following connector.
Audio-navigation unit connector A (24P) (with navigation)
Audio unit connector A (24P) (without navigation)

?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 C (16P): disconnected
 
Audio-navigation unit connector A (24P) (with navigation): disconnected
Audio unit connector A (24P) (without navigation): disconnected
Test point 1
Audio-navigation unit connector A (24P) (with navigation) No. 21
 
Audio unit connector A (24P) (without navigation) No. 21
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to body ground in the wire.?
     
NO: With navigation
     
     
     
     
NO: Without navigation
     
     
     
10.
Open wire check (GND line):

Open wire check (GND line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Reconnect stereo amplifier connector A (18P).

?3.
Reconnect stereo amplifier connector C (16P).

?4.
Turn the vehicle to the ON mode.

?5.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Test point 1
Stereo amplifier connector A (18P) No. 1
Test point 2
Body ground

Is there less than 0.2 V?

     
YES
     
     
     
The GND wire is OK. Go to step 11.
     
NO
     
     
     
Repair an open or high resistance in the ground wire or poor ground (G402).?
11.
Shorted wire check (RS485? line, RS485? line):

Shorted wire check (RS485? line, RS485? line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Audio-navigation unit connector E (16P) (with navigation)
Audio unit connector E (16P) (without navigation)
Stereo amplifier connector C (16P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector E (16P) (with navigation): disconnected
Audio unit connector E (16P) (without navigation): disconnected
 
Stereo amplifier connector C (16P): disconnected
Test point 1
Audio-navigation unit connector E (16P) (with navigation) No. 7
 
Audio unit connector E (16P) (without navigation) No. 7
Test point 2
Body ground


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 12.
12.
Shorted wire check (RS485? line to RS485? line):

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-navigation unit connector E (16P) (with navigation): disconnected
Audio unit connector E (16P) (without navigation): disconnected
 
Stereo amplifier connector C (16P): disconnected
Test point 1
Audio-navigation unit connector E (16P) (with navigation) No. 7
 
Audio unit connector E (16P) (without navigation) No. 7
Test point 2
Audio-navigation unit connector E (16P) (with navigation) No. 8
 
Audio unit connector E (16P) (without navigation) No. 8

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 13.
13.
Shorted wire check (AMP RS485 SH line to another lines):

Shorted wire check (AMP RS485 SH line to another lines)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector E (16P) (with navigation): disconnected
Audio unit connector E (16P) (without navigation): disconnected
 
Stereo amplifier connector C (16P): disconnected
Test point 1
Audio-navigation unit connector E (16P) (with navigation) No. 6
 
Audio unit connector E (16P) (without navigation) No. 6
Test point 2
Audio-navigation unit connector E (16P) (with navigation) No. 7
 
Audio unit connector E (16P) (without navigation) No. 7


Is there continuity?

     
YES
     
     
     
There is a short in the wires. Replace the affected shielded harness.?
     
NO
     
     
     
The AMP RS485 SH wire is OK. Go to step 14.
14.
Open wire check (RS485? line, RS485? line):

Open wire check (RS485? line, RS485? line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector E (16P) (with navigation): disconnected
Audio unit connector E (16P) (without navigation): disconnected
 
Stereo amplifier connector C (16P): disconnected
Test point 1
Audio-navigation unit connector E (16P) (with navigation) No. 7
 
Audio unit connector E (16P) (without navigation) No. 7
Test point 2
Stereo amplifier connector C (16P) No. 15


Is there continuity?

     
YES
     
     
     
The RS485? and the RS485? wires are OK. Go to step 18.
     
NO
     
     
     
There is an open in the wire(s). Replace the affected shielded harness.?
15.
Shorted wire check (SPDIF2 SIG line):

Shorted wire check (SPDIF2 SIG line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Audio-navigation unit connector M (4P) (with navigation)
Audio unit connector M (4P) (without navigation)
Stereo amplifier connector D (2P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector M (4P) (with navigation): disconnected
Audio unit connector M (4P) (without navigation): disconnected
 
Stereo amplifier connector D (2P): disconnected
Test point 1
Audio-navigation unit connector M (4P) (with navigation) No. 1
 
Audio unit connector M (4P) (without navigation) No. 1
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
There is a short to body ground in the wire(s). Replace the affected shielded harness.?
     
NO
     
     
     
The SPDIF2 SIG wire is not shorted to ground. Go to step 16.
16.
Shorted wire check (SPDIF2 SIG line to SPDIF2 SH line):

Shorted wire check (SPDIF2 SIG line to SPDIF2 SH line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector M (4P) (with navigation): disconnected
Audio unit connector M (4P) (without navigation): disconnected
 
Stereo amplifier connector D (2P): disconnected
Test point 1
Audio-navigation unit connector M (4P) (with navigation) No. 1
 
Audio unit connector M (4P) (without navigation) No. 1
Test point 2
Audio-navigation unit connector M (4P) (with navigation) No. 3
 
Audio unit connector M (4P) (without navigation) No. 3

Is there continuity?

     
YES
     
     
     
There is a short in the wires. Replace the affected shielded harness.?
     
NO
     
     
     
The SPDIF2 SIG and the SPDIF2 SH wires are not shorted. Go to step 17.
17.
Open wire check (SPDIF2 SIG line):

Open wire check (SPDIF2 SIG line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector M (4P) (with navigation): disconnected
Audio unit connector M (4P) (without navigation): disconnected
 
Stereo amplifier connector D (2P): disconnected
Test point 1
Audio-navigation unit connector M (4P) (with navigation) No. 1
 
Audio unit connector M (4P) (without navigation) No. 1
Test point 2
Stereo amplifier connector D (2P) No. 1

Is there continuity?

     
YES
     
     
     
The SPDIF2 SIG wire is OK. Go to step 18.
     
NO
     
     
     
There is an open in the wire(s). Replace the affected shielded harness.?
18.
Stereo amplifier check (substitution):

Stereo amplifier check (substitution)
?1.
Substitute a known-good stereo amplifier.

?2.
Reconnect all the connectors, and recheck.

Does the symptom go away?

     
YES
     
     
     
     
NO: With navigation
     
     
     
     
NO: Without navigation
     
     
     
19.
Shorted wire check (SPKR lines) 1:

Shorted wire check (SPKR lines) 1
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Audio-navigation unit connector A (24P) (with navigation)
Audio unit connector A (24P) (without navigation)

?3.
Check for continuity between these test points and body ground individually.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector A (24P) (with navigation): disconnected
Audio unit connector A (24P) (without navigation): disconnected

Connector
Terminal
Audio-navigation unit connector A (24P) (with navigation)

Audio unit connector A (24P) (without navigation)
No. 5
No. 6
No. 7
No. 8
No. 15
No. 16
No. 17
No. 18

Is there continuity?

     
YES
     
     
     
Repair a short to body ground in the wire(s).?
     
NO
     
     
     
The SPKR wires are not shorted to ground. Go to step 20.
20.
Shorted wire check (SPKR lines) 2:

Shorted wire check (SPKR lines) 2
?1.
Measure the resistance between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio-navigation unit connector A (24P) (with navigation): disconnected
Audio unit connector A (24P) (without navigation): disconnected


Is the resistance OK?

     
YES: With navigation
     
     
     
     
YES: Without navigation
     
     
     
     
NO
     
     
     
Repair a short in the wires.?