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:
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: USA and Canada production
     
     
     
Go to step 4.
     
NO: Except USA and Canada production
     
     
     
Go to step 2.
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 line):

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

?2.
Disconnect the following connector.
Audio unit connector A (24P)

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Audio unit connector A (24P): disconnected
Test point 1
Audio unit connector A (24P) No. 13
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
     
NO
     
     
     
Repair an open in the wire.?
4.
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 5.
     
NO
     
     
     
Go to step 6.
5.
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 at the audio unit, the stereo amplifier, 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 16.
6.
Fuse check:

Fuse check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check the following fuse.
USA and Canada production
Fuse
No. A20

Except USA and Canada production
Fuse
No. A1-4

Is the fuse OK?

     
YES
     
     
     
Go to step 7.
     
NO: USA and Canada production
     
     
     
Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. A20 fuse circuit.?
     
NO: Except USA and Canada production
     
     
     
Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. A1-4 fuse circuit.?
7.
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 8.
     
NO
     
     
     
Repair an open in the wire.?
8.
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 11.
     
NO
     
     
     
Go to step 9.
9.
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 unit connector A (24P) 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 10.
10.
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 connectors.
Audio unit connector A (24P)
Active sound control unit 20P connector (
 
'20-21
 
Si)

?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 unit connector A (24P): disconnected
 
Active sound control unit 20P connector: disconnected
Test point 1
Audio unit connector A (24P) No. 21
Test point 2
Body ground

Is there 1 M? or more?

     
YES
     
     
     
     
NO
     
     
     
Repair a short to body ground in the wire.?
11.
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 12.
     
NO
     
     
     
Repair an open or high resistance in the wire or poor ground (G504).?
12.
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 unit connector E (16P)
Stereo amplifier connector C (16P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio unit connector E (16P): disconnected
 
Stereo amplifier connector C (16P): disconnected
Test point 1
Audio unit connector E (16P) No. 7
Test point 2
Body ground

Test point 1
Audio unit connector E (16P) No. 8
Test point 2
Body ground

Is there 1 M? or more?

     
YES
     
     
     
The RS485+ and the RS485? wires are not shorted to ground. Go to step 13.
     
NO
     
     
     
There is a short to body ground in the wire(s). Replace the affected shielded harness.?
13.
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 unit connector E (16P): disconnected
 
Stereo amplifier connector C (16P): disconnected
Test point 1
Audio unit connector E (16P) No. 7
Test point 2
Audio unit connector E (16P) No. 8

Is there 1 M? or more?

     
YES
     
     
     
The RS485+ and the RS485? wires are not shorted. Go to step 14.
     
NO
     
     
     
There is a short in the wires. Replace the affected shielded harness.?
14.
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 unit connector E (16P): disconnected
 
Stereo amplifier connector C (16P): disconnected
Test point 1
Audio unit connector E (16P) No. 6
Test point 2
Audio unit connector E (16P) No. 7


Is there 1 M? or more?

     
YES
     
     
     
The AMP RS485 SH wire is OK. Go to step 15.
     
NO
     
     
     
There is a short in the wires. Replace the affected shielded harness.?
15.
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 unit connector E (16P): disconnected
 
Stereo amplifier connector C (16P): disconnected
Test point 1
Audio unit connector E (16P) No. 7
Test point 2
Stereo amplifier connector C (16P) No. 15


Is there 1.0 ? or less?

     
YES
     
     
     
The RS485+ and the RS485? wires are OK. Go to step 19.
     
NO
     
     
     
There is an open in the wire(s). Replace the affected shielded harness.?
16.
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 unit connector M (4P)
Stereo amplifier connector D (2P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio unit connector M (4P): disconnected
 
Stereo amplifier connector D (2P): disconnected
Test point 1
Audio unit connector M (4P) No. 1
Test point 2
Body ground

Is there 1 M? or more?

     
YES
     
     
     
The SPDIF2 SIG wire is not shorted to ground. Go to step 17.
     
NO
     
     
     
There is a short to body ground in the wire(s). Replace the affected shielded harness.?
17.
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 unit connector M (4P): disconnected
 
Stereo amplifier connector D (2P): disconnected
Test point 1
Audio unit connector M (4P) No. 1
Test point 2
Audio unit connector M (4P) No. 3

Is there 1 M? or more?

     
YES
     
     
     
The SPDIF2 SIG and the SPDIF2 SH wires are not shorted. Go to step 18.
     
NO
     
     
     
There is a short in the wires. Replace the affected shielded harness.?
18.
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 unit connector M (4P): disconnected
 
Stereo amplifier connector D (2P): disconnected
Test point 1
Audio unit connector M (4P) No. 1
Test point 2
Stereo amplifier connector D (2P) No. 1

Is there 1.0 ? or less?

     
YES
     
     
     
The SPDIF2 SIG wire is OK. Go to step 19.
     
NO
     
     
     
There is an open in the wire(s). Replace the affected shielded harness.?
19.
Stereo amplifier check:

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