Audio System Symptom Troubleshooting - No sound is heard from all the speakers (display is normal) (With Stereo Amplifier, With Navigation)

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-navigation 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-navigation unit connector A (24P): disconnected
Test point 1	Audio-navigation unit connector A (24P) No. 13
Test point 2	Body ground

Is there battery voltage?


	YES

Replace the audio-navigation unit.?


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

Is there 1 M? or more?


	YES

Replace the audio-navigation unit.?


	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-navigation 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-navigation unit connector E (16P): disconnected
	Stereo amplifier connector C (16P): disconnected
Test point 1	Audio-navigation unit connector E (16P) No. 7
Test point 2	Body ground

Test point 1	Audio-navigation 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-navigation unit connector E (16P): disconnected
	Stereo amplifier connector C (16P): disconnected
Test point 1	Audio-navigation unit connector E (16P) No. 7
Test point 2	Audio-navigation 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-navigation unit connector E (16P): disconnected
	Stereo amplifier connector C (16P): disconnected
Test point 1	Audio-navigation unit connector E (16P) No. 6
Test point 2	Audio-navigation unit connector E (16P) No. 7

Test point 1	Audio-navigation unit connector E (16P) No. 6
Test point 2	Audio-navigation unit connector E (16P) No. 8

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-navigation unit connector E (16P): disconnected
	Stereo amplifier connector C (16P): disconnected
Test point 1	Audio-navigation unit connector E (16P) No. 7
Test point 2	Stereo amplifier connector C (16P) No. 15

Test point 1	Audio-navigation unit connector E (16P) No. 8
Test point 2	Stereo amplifier connector C (16P) No. 7

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-navigation 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-navigation unit connector M (4P): disconnected
	Stereo amplifier connector D (2P): disconnected
Test point 1	Audio-navigation 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-navigation unit connector M (4P): disconnected
	Stereo amplifier connector D (2P): disconnected
Test point 1	Audio-navigation unit connector M (4P) No. 1
Test point 2	Audio-navigation 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-navigation unit connector M (4P): disconnected
	Stereo amplifier connector D (2P): disconnected
Test point 1	Audio-navigation 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

Replace the audio-navigation unit.?