Audio System Symptom Troubleshooting - No sound is heard from the speaker(s) (display is normal) (Display Audio (With Navigation))

1.

Problem verification:

Problem verification

?1.	Press the engine start/stop button to select the ON mode.

?2.	Turn on the audio system, and check for sound in each mode (AM/FM, and CD).

Is the sound OK in each mode?


	YES

Intermittent failure, the system is OK at this time. Check for loose connections at the audio-navigation unit and speaker(s).?


	NO: No sound is heard in all modes

The failure is duplicated in all modes, go to step 2.


	NO: No sound is heard in AM/FM mode

Go to Poor AM or FM radio reception or interference troubleshooting.?


	NO: No sound is heard in CD mode

Go to Audio disc does not play troubleshooting.?

2.

Determine possible failure area (BUS lines, others):

Determine possible failure area (BUS lines, others)

?1.	Turn on the audio unit, and select AM or FM mode.

Is there radio station information displayed?


	YES

Go to step 3.


	NO

Go to step 18.

3.

Determine possible failure area (audio-navigation unit, others):

Determine possible failure area (audio-navigation unit, others)

?1.	Go into the System Diagnostic Mode, and use the speaker check mode.

Did all speakers produce a tone?


	YES

Replace the audio-navigation unit.?


	NO

Go to step 4.

4.

Fuse check:

Fuse check

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

?2.

Check the following fuse.

Fuse	No. C1 (20 A)
Location	Under-dash sub fuse box

Is the fuse OK?


	YES

Go to step 5.


	NO

Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. C1 (20 A) fuse circuit.?

5.

Open wire check (+B AUDIO AMP line):

Open wire check (+B AUDIO AMP line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
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 6.


	NO

Repair an open in the wire between the No. C1 (20 A) fuse in the under-dash sub fuse box and the stereo amplifier.?

6.

Determine possible failure area (SWD+B line, others):

Determine possible failure area (SWD+B line, others)

?1.

Disconnect the following connector.

Stereo amplifier connector B (24P)

?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 B (24P): disconnected
Test point 1	Stereo amplifier connector B (24P) No. 13
Test point 2	Body ground

Is there battery voltage?


	YES

The SWD+B wire is OK. Go to step 9.


	NO

Go to step 7.

7.

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 B (24P): 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 between the stereo amplifier and the audio-navigation unit.?


	NO

The SWD+B wire is not open. Go to step 8.

8.

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.

ANC/active sound control unit 20P connector

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF mode
	Stereo amplifier connector B (24P): disconnected
	ANC/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 continuity?


	YES

Repair a short in the wire between the stereo amplifier and the audio-navigation unit.?


	NO

Replace the audio-navigation unit.?

9.

Open wire check (GND line):

Open wire check (GND line)

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

?2.	Reconnect stereo amplifier connector B (24P).

?3.	Turn the vehicle to the ON mode.

?4.

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 10.


	NO

Repair an open or high resistance in the wire between the stereo amplifier and body ground (G506).?

10.

Shorted wire check (SPKR lines, TWEETER lines, SUB WOOFER lines):

Shorted wire check (SPKR lines, TWEETER lines, SUB WOOFER lines)

?1.	Press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

Stereo amplifier connector A (18P)

?3.

Check for continuity between these test points and body ground individually.

Test condition	Vehicle OFF mode
	Stereo amplifier connector A (18P): disconnected

Connector	Terminal
Stereo amplifier connector A (18P)	No. 13
	No. 6
	No. 12
	No. 5
	No. 14
	No. 7
	No. 15
	No. 8
	No. 16
	No. 9
	No. 17
	No. 10
	No. 4
	No. 2

Is there continuity?


	YES

Repair a short to body ground in the wire(s) between the stereo amplifier and the speaker(s).?


	NO

The SPKR, the TWEETER, and the SUB WOOFER wires are not shorted to ground. Go to step 11.

11.

Determine possible failure area (speaker, others) 1:

Determine possible failure area (speaker, others) 1

?1.	Check the speaker(s) with no sound for any damage.

Is there any damage?


	YES

Replace the faulty speaker(s).?


	NO

Go to step 12.

12.

Determine possible failure area (speaker, others) 2:

Determine possible failure area (speaker, others) 2

?1.	Test the speaker(s).

Is the speaker(s) OK?


	YES

Go to step 13.


	NO

Replace the faulty speaker(s).?

13.

Open wire check (SPKR lines, SUB WOOFER lines):

Open wire check (SPKR lines, SUB WOOFER lines)

?1.	Reconnect all the speaker connectors.

?2.

Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF mode
	Stereo amplifier connector A (18P): disconnected

Test point 1: Stereo amplifier connector A (18P)	Test point 2: Stereo amplifier connector A (18P)	Resistance
No. 13	No. 6	About 4 ?
No. 14	No. 7	About 4 ?
No. 12	No. 5	About 3.3 ?
No. 15	No. 8	About 3.3 ?
No. 16	No. 9	About 4 ?
No. 17	No. 10	About 4 ?
No. 4	No. 2	About 2 ?

Is the resistance OK?


	YES

The SPKR and the SUB WOOFER wires are OK. Go to step 14.


	NO

Repair an open in the wire between the stereo amplifier and the speaker(s).?

14.

Open wire check (PRE lines):

Open wire check (PRE lines)

?1.

Disconnect the following connectors.

NOTE: Eject the disc before disconnecting the audio-navigation unit to prevent damaging the CD player load mechanism.

Stereo amplifier connector B (24P)

Audio-navigation unit connector A (24P)

Audio-navigation unit connector B (8P)

?2.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	Stereo amplifier connector A (18P): disconnected
	Stereo amplifier connector B (24P): disconnected
	Audio-navigation unit connector A (24P): disconnected
	Audio-navigation unit connector E (8P): disconnected

Test point 1: Audio-navigation unit connector A (24P)	Test point 2: Stereo amplifier connector B (24P)
No. 15	No. 23
No. 16	No. 11
No. 19	No. 20
No. 20	No. 8
No. 5	No. 21
No. 6	No. 9
No. 9	No. 18
No. 10	No. 6

Test point 1: Audio-navigation unit connector E (8P)	Test point 2: Stereo amplifier connector B (24P)
No. 5	No. 17
No. 7	No. 5

Is there continuity


	YES

The PRE wires are not open. Go to step 15.


	NO

There is an open in the wire(s) between the audio-navigation unit and the stereo amplifier. Replace the affected shielded harness.?

15.

Shorted wire check (PRE lines):

Shorted wire check (PRE lines)

?1.

Check for continuity between these test points and body ground individually.

Test condition	Vehicle OFF mode
	Stereo amplifier connector A (18P): disconnected
	Stereo amplifier connector B (24P): disconnected
	Audio-navigation unit connector A (24P): disconnected
	Audio-navigation unit connector E (8P): disconnected

Connector	Terminal
Audio-navigation unit connector A (24P)	No. 15
	No. 16
	No. 19
	No. 20
	No. 5
	No. 6
	No. 9
	No. 10

Connector	Terminal
Audio-navigation unit connector E (8P)	No. 5
Audio-navigation unit connector E (8P)	No. 7

Is there continuity?


	YES

There is a short to body ground in the wire(s) between the stereo amplifier and the audio-navigation unit. Replace the affected shielded harness.?


	NO

The PRE wires are not shorted to ground. Go to step 16.

16.

Shorted wire check (SH PRE line to another lines)

?1.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	Stereo amplifier connector A (18P): disconnected
	Stereo amplifier connector B (24P): disconnected
	Audio-navigation unit connector A (24P): disconnected
	Audio-navigation unit connector E (8P): disconnected

Test point 1 Stereo amplifier connector B (24P)	Test points 2 Stereo amplifier connector B (24P)
No. 10	No. 23, No. 11
No. 7	No. 20, No. 8
No. 22	No. 21, No. 9
No. 19	No. 18, No. 6
No. 4	No. 17, No. 5

Is there continuity between any of the terminals?


	YES

There is a short in the wires between the stereo amplifier and the audio-navigation unit. Replace the affected shielded harness.?


	NO

The SH PRE wires and the PRE wires are OK. Go to step 17.

17.

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

Replace the original stereo amplifier.?


	NO

Replace the audio-navigation unit.?

18.

Determine possible failure area (related unit, others):

Determine possible failure area (related unit, others)

?1.	Press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

Multi-information display unit connector A (12P)

?3.	Turn the vehicle to the ON mode.

?4.	Turn on the audio system, and check for sound in each mode.

Does the symptom go away?


	YES

Replace the multi-information display unit.?


	NO

Go to step 19.

19.

Shorted wire check (GA BUS+ line, GA BUS? line):

Shorted wire check (GA BUS+ line, GA BUS? line)

?1.	Press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connectors.

Audio-navigation unit connector D (12P)

Tuner unit connector A (12P)

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Multi-information display unit connector A (12P): disconnected
	Audio-navigation unit connector D (12P): disconnected
	Tuner unit connector A (12P): disconnected
Test point 1	Audio-navigation unit connector D (12P) No. 7
Test point 2	Body ground

Test point 1	Audio-navigation unit connector D (12P) No. 1
Test point 2	Body ground

Is there continuity?


	YES

There is a short to body ground in the GA BUS wire(s). Replace the affected shielded harness.?


	NO

The GA BUS+ and the GA BUS? wires are not shorted to ground. Go to step 20.

20.

Shorted wire check (GA BUS+ line to GA BUS? line) :

Shorted wire check (GA BUS+ line to GA BUS? line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Multi-information display unit connector A (12P): disconnected
	Audio-navigation unit connector D (12P): disconnected
	Tuner unit connector A (12P): disconnected
Test point 1	Audio-navigation unit connector D (12P) No. 7
Test point 2	Audio-navigation unit connector D (12P) No. 1

Is there continuity?


	YES

There is a short in the GA BUS wires. Replace the affected shielded harness.?


	NO

The GA BUS+ and the GA BUS? wires are not shorted. Go to step 21.

21.

Shorted wire check (SH GA BUS line to another lines):

Shorted wire check (SH GA BUS line to another lines)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Multi-information display unit connector A (12P): disconnected
	Audio-navigation unit connector D (12P): disconnected
	Tuner unit connector A (12P): disconnected
Test point 1	Audio-navigation unit connector D (12P) No. 2
Test point 2	Audio-navigation unit connector D (12P) No. 7

Test point 1	Audio-navigation unit connector D (12P) No. 2
Test point 2	Audio-navigation unit connector D (12P) No. 1

Is there continuity?


	YES

There is a short in the GA BUS wires. Replace the affected shielded harness.?


	NO

The SH GA BUS wire is OK. Go to step 22.

22.

Open wire check (GA BUS+ line, GA BUS? line):

Open wire check (GA BUS+ line, GA BUS? line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Multi-information display unit connector A (12P): disconnected
	Audio-navigation unit connector D (12P): disconnected
	Tuner unit connector A (12P): disconnected
Test point 1	Audio-navigation unit connector D (12P) No. 7
Test point 2	Tuner unit connector A (12P) No. 7

Test point 1	Audio-navigation unit connector D (12P) No. 1
Test point 2	Tuner unit connector A (12P) No. 1

Is there continuity?


	YES

The GA BUS+ and the GA BUS? wires are OK. Go to step 23.


	NO

There is an open in the wire(s) between the audio-navigation unit and the tuner unit. Replace the affected shielded harness.?

23.

Determine possible failure area (GA +B line, others):

Determine possible failure area (GA +B line, others)

?1.	Reconnect all the connectors.

?2.	Turn the vehicle to the ON mode.

?3.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	Tuner unit connector A (12P) No. 12
Test point 2	Body ground

Is there battery voltage?


	YES

The GA +B wire is OK. Go to step 24.


	NO

Go to step 27.

24.

Determine possible failure area (GA GND line, others):

Determine possible failure area (GA GND line, others)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	Tuner unit connector A (12P) No. 6
Test point 2	Body ground

Is there less than 0.2 V?


	YES

The GA GND wire is OK. Go to step 25.


	NO

Go to step 29.

25.

Determine possible failure area (GA SYS ON line, others):

Determine possible failure area (GA SYS ON line, others)

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

?2.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
Test point 1	Tuner unit connector A (12P) No. 8
Test point 2	Body ground

Is there battery voltage?


	YES

The GA SYS ON wire is OK. Go to step 26.


	NO

Go to step 30.

26.

Tuner unit check:

Tuner unit check

?1.	Turn the vehicle to the ON mode.

?2.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	Tuner unit connector A (12P) No. 8
Test point 2	Body ground

Is there less than 0.2 V?


	YES

Replace the tuner unit.?


	NO

Replace the audio-navigation unit.?

27.

Open wire check (GA +B line):

Open wire check (GA +B line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	Audio-navigation unit connector D (12P) No. 12
Test point 2	Body ground

Is there battery voltage?


	YES

Repair an open in the wire between the audio-navigation unit and the tuner unit.?


	NO

The GA +B wire is not open. Go to step 28.

28.

Shorted wire check (GA +B line):

Shorted wire check (GA +B line)

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

?2.

Disconnect the following connectors.

Audio-navigation unit connector D (12P)

Tuner unit connector A (12P)

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Audio-navigation unit connector D (12P): disconnected
	Tuner unit connector A (12P): disconnected
Test point 1	Tuner unit connector A (12P) No. 12
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to body ground in the wire between the audio-navigation unit and the tuner unit.?


	NO

Replace the audio-navigation unit.?

29.

Open wire check (GA GND line):

Open wire check (GA GND line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	Audio-navigation unit connector D (12P) No. 6
Test point 2	Body ground

Is there any voltage?


	YES

Replace the audio-navigation unit.?


	NO

Repair an open or high resistance in the wire between the audio-navigation unit and the tuner unit.?

30.

Open wire check (GA SYS ON line):

Open wire check (GA SYS ON line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF(LOCK) mode
Test point 1	Audio-navigation unit connector D (12P) No. 8
Test point 2	Body ground

Is there battery voltage?


	YES

Repair an open in the wire between the audio-navigation unit and the tuner unit.?


	NO

Replace the audio-navigation unit.?