Audio System Symptom Troubleshooting - Booming sound while driving with audio unit on or off (Display Audio (Without Navigation))

1.

Problem verification:

Problem verification

?1.	Start the engine.

Is a booming sound or a low-frequency hum heard from speakers?


	YES

The failure is duplicated, go to step 2.


	NO

Intermittent failure, the system is OK at this time.?

2.

Determine possible failure area (SPKR lines, others):

Determine possible failure area (SPKR lines, others)

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

Did all speakers produce a tone?


	YES: Without stereo amplifier

Go to step 3.


	YES: With stereo amplifier

Go to step 4.


	NO

Go to No sound is heard from the speaker(s) troubleshooting.?

3.

Shorted wire check (SPKR lines):

Shorted wire check (SPKR lines)

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

?2.

Disconnect the following connector.

All the speaker connectors

Audio unit connector A (24P)

?3.

Check for continuity between these test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	All the speaker connectors: disconnected
	Audio unit connector A (24P): disconnected

Test point 1: Audio unit connector A (24P)	Test point 2: Audio unit connector A (24P)
No. 15	No. 16
No. 19	No. 20
No. 5	No. 6
No. 9	No. 10

Is there continuity?


	YES

Repair a short in the wire(s) between the audio unit and the speaker(s).?


	NO

The SPKR wires are not shorted. Go to step 6.

4.

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

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

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

?2.

Disconnect the following connector.

All the speaker connectors

Stereo amplifier connector A (18P)

?3.

Check for continuity between these test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	All the speaker connectors: disconnected
	Stereo amplifier connector A (18P): disconnected

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

Is there continuity?


	YES

Repair a short 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. Go to step 5.

5.

Shorted wire check (PRE lines):

Shorted wire check (PRE lines)

?1.

Disconnect the following connectors.

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

Stereo amplifier connector B (24P)

Audio unit connector A (24P)

Audio unit connector E (8P)

?2.

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

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

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

Connector	Terminal
Audio unit connector E (8P)	No. 5
Audio 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 unit. Replace the affected shielded harness.?


	NO

The PRE wires are not shorted to ground. Go to step 6.

6.

Open wire check (+B BACK UP line):

Open wire check (+B BACK UP line)

?1.	Reconnect all the connectors.

?2.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
Test point 1	ANC/active sound control unit 20P connector No. 11
Test point 2	Body ground

Is there battery voltage?


	YES

The +B BACK UP wire is OK. Go to step 7.


	NO

Repair an open in the wire between the No. A21 (10 A) fuse in the under-hood fuse/relay box and the ANC/active sound control unit.?

7.

Open wire check (IG1 METER line):

Open wire check (IG1 METER line)

?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	ANC/active sound control unit 20P connector No. 12
Test point 2	Body ground

Is there battery voltage?


	YES

The IG1 METER wire is OK. Go to step 8.


	NO

Repair an open or high resistance in the wire between the No. B5 (7.5 A) fuse in the under-dash fuse/relay box and the ANC/active sound control unit.?

8.

Open wire check (GND line):

Open wire check (GND line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	ANC/active sound control unit 20P connector No. 1
Test point 2	Body ground

Is there less than 0.2 V?


	YES

The GND wire is OK. Go to step 9.


	NO

Repair an open or high resistance in the wire between the ANC/active sound control unit and body ground (G503).?

9.

Open wire check (SWD+B line):

Open 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.	Turn the vehicle to the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	ANC/active sound control unit 20P connector: disconnected
Test point 1	ANC/active sound control unit 20P connector No. 3
Test point 2	Body ground

Is there battery voltage?


	YES

The SWD+B wire is OK. Go to step 10.


	NO

Repair an open in the wire between the ANC/active sound control unit and the audio unit.?

10.

Determine possible failure area (ANC CHK2 line, others):

Determine possible failure area (ANC CHK2 line, others)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	ANC/active sound control unit 20P connector: disconnected
Test point 1	ANC/active sound control unit 20P connector No. 13
Test point 2	Body ground

Is there about 5.0 V?


	YES

The ANC CHK2 wire is OK. Go to step 13.


	NO

Go to step 11.

11.

Open wire check (ANC CHK2 line):

Open wire check (ANC CHK2 line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	ANC/active sound control unit 20P connector: disconnected
Test point 1	Audio unit connector J (28P) No. 3
Test point 2	Body ground

Is there about 5.0 V?


	YES

Repair an open in the wire between the audio unit and the ANC/active sound control unit.?


	NO

The ANC CHK2 wire is not open. Go to step 12.

12.

Shorted wire check (ANC CHK2 line):

Shorted wire check (ANC CHK2 line)

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

?2.

Disconnect the following connector.

Audio unit connector J (28P)

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	ANC/active sound control unit 20P connector: disconnected
	Audio unit connector J (28P): disconnected
Test point 1	Audio unit connector J (28P) No. 3
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the wire between the audio unit and the ANC/active sound control unit.?


	NO

Replace the audio unit.?

13.

Shorted wire check (ANC SH line to another lines):

Shorted wire check (ANC SH line to another lines)

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

?2.

Disconnect the following connectors.

Audio unit connector J (28P) (without stereo amplifier)

Stereo amplifier connector B (24P) (with stereo amplifier)

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	ANC/active sound control unit 20P connector: disconnected
	Audio unit connector J (28P) (without stereo amplifier): disconnected
	Stereo amplifier connector B (24P) (with stereo amplifier): disconnected

Connector:
Test point 1 ANC/active sound control unit 20P connector	Test points 2 ANC/active sound control unit 20P connector
No. 8	No. 9, No. 19, No. 10, No. 20
No. 9	No. 19, No. 10, No. 20
No. 19	No. 10, No. 20
No. 10	No. 20

Is there continuity?


	YES

There is a short in the wires between the ANC/active sound control unit and the stereo amplifier or audio unit. Replace the affected shielded harness.?


	NO: With stereo amplifier

The ANC wires are not shorted to ground. Go to step 14.


	NO: Without stereo amplifier

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

14.

Open wire check (ANC lines):

Open wire check (ANC lines)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	ANC/active sound control unit 20P connector: disconnected
	Stereo amplifier connector B (24P) : disconnected

Test point 1: ANC/active sound control unit 20P connector	Test point 2: Stereo amplifier connector B (24P)
No. 20	No. 15
No. 10	No. 2
No. 19	No. 14
No. 9	No. 1

Is there continuity?


	YES

The ANC wires are OK. Go to step 15.


	NO

There is an open in the wire(s) between the ANC/active sound control unit and the stereo amplifier. Replace the affected shielded harness.?

15.

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

Go to step 18.

16.

Open wire check (ANC lines):

Open wire check (ANC lines)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	ANC/active sound control unit 20P connector: disconnected
	Audio unit connector J (28P): disconnected

Test point 1: ANC/active sound control unit 20P connector	Test point 2: Audio unit connector J (28P)
No. 20	No. 17
No. 10	No. 18
No. 19	No. 1
No. 9	No. 2

Is there continuity?


	YES

The ANC wires are OK. Go to step 17.


	NO

There is an open in the wire(s) between the ANC/active sound control unit and the audio unit. Replace the affected shielded harness.?

17.

Audio unit check (substitution):

Audio unit check (substitution)

?1.	Substitute a known-good audio unit.

?2.	Reconnect all the connectors, and recheck.

Does the symptom go away?


	YES

Replace the original audio unit.?


	NO

Go to step 18.

18.

Determine possible failure area (MIC PWR line, others):

Determine possible failure area (MIC PWR line, others)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	Front HFL-ANC/active sound control microphone 8P connector No. 4
Test point 2	Body ground

Is there about 8.0 V?


	YES

The MIC PWR wire is OK. Go to step 19.


	NO

Go to step 32.

19.

Determine possible failure area (MIC?line, others):

Determine possible failure area (MIC? line, others)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	Front HFL-ANC/active sound control microphone 8P connector No. 1
Test point 2	Body ground

Is there less than 0.2 V?


	YES

The MIC?wire is OK. Go to step 20.


	NO

Go to step 33.

20.

Determine possible failure area (ANC F MIC+8V line, others):

Determine possible failure area (ANC F MIC+8V line, others)

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

?2.

Disconnect the following connector.

Front HFL-ANC/active sound control microphone 8P connector

?3.	Turn the vehicle to the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	Front HFL-ANC/active sound control microphone 8P connector: disconnected
Test point 1	Front HFL-ANC/active sound control microphone 8P connector No. 8
Test point 2	Body ground

Is there about 8.0 V?


	YES

Go to step 21.


	NO

Go to step 22.

21.

Determine possible failure area (front HFL-ANC/active sound control microphone, others):

Determine possible failure area (front HFL-ANC/active sound control microphone, others)

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

?2.	Reconnect the front HFL-ANC/active sound control microphone 8P connector.

?3.	Turn the vehicle to the ON mode.

?4.

Measure the voltage between test points 1 and 2.

NOTE: Use the voltmeter in AC range.

Test condition	Vehicle ON mode, make a loud noise like clapping your hands in front of the front HFL-ANC/active sound control microphone.
Test point 1	ANC/active sound control unit 20P connector No. 18
Test point 2	ANC/active sound control unit 20P connector No. 7

Does the voltage change when making a loud noise in front of the microphone?


	YES

Go to step 25.


	NO

Replace the front HFL-ANC/active sound control microphone.?

22.

Open wire check (ANC F MIC+8V line):

Open wire check (ANC F MIC+8V line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	Front HFL-ANC/active sound control microphone 8P connector: disconnected
Test point 1	ANC/active sound control unit 20P connector No. 18
Test point 2	Body ground

Is there about 8.0 V?


	YES

There is an open in the wire between the ANC/active sound control unit and the front HFL-ANC/active sound control microphone. Replace the affected shielded harness.?


	NO

The ANC F MIC+8V wire is not open. Go to step 23.

23.

Shorted wire check (ANC F MIC+8V line):

Shorted wire check (ANC F MIC+8V 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 (LOCK) mode
	Front HFL-ANC/active sound control microphone 8P connector: disconnected
	ANC/active sound control unit 20P connector: disconnected
Test point 1	ANC/active sound control unit 20P connector No. 18
Test point 2	Body ground

Is there continuity?


	YES

There is a short to body ground in the wire between the ANC/active sound control unit and the front HFL-ANC/active sound control microphone. Replace the affected shielded harness.?


	NO

The ANC F MIC+8V wire is not shorted to ground. Go to step 24.

24.

Shorted wire check (SH ANC F MIC line to ANC F MIC+8V line):

Shorted wire check (SH ANC F MIC line to ANC F MIC+8V line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Front HFL-ANC/active sound control microphone 8P connector: disconnected
	ANC/active sound control unit 20P connector: disconnected
Test point 1	ANC/active sound control unit 20P connector No. 7
Test point 2	ANC/active sound control unit 20P connector No. 18

Is there continuity?


	YES

There is a short in the wires between the ANC/active sound control unit and the front HFL-ANC/active sound control microphone. Replace the affected shielded harness.?


	NO

The SH ANC F MIC and the ANC F MIC+8V wires are not shorted. Go to step 30.

25.

Determine possible failure area (ANC R MIC+8V line, others):

Determine possible failure area (ANC R MIC+8V line, others)

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

?2.

Disconnect the following connector.

Rear ANC/active sound control microphone 2P connector

?3.	Turn the vehicle to the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	Rear ANC/active sound control microphone 2P connector: disconnected
Test point 1	Rear ANC/active sound control microphone 2P connector No. 1
Test point 2	Rear ANC/active sound control microphone 2P connector No. 2

Is there about 8.0 V?


	YES

Go to step 26.


	NO

Go to step 27.

26.

Determine possible failure area (rear ANC/active sound control microphone, others):

Determine possible failure area (rear ANC/active sound control microphone, others)

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

?2.	Reconnect the rear ANC/active sound control microphone 2P connector.

?3.	Turn the vehicle to the ON mode.

?4.

Measure the voltage between test points 1 and 2.

NOTE: Use the voltmeter in AC range.

Test condition	Vehicle ON mode, make a loud noise like clapping your hands in front of the rear ANC/active sound control microphone.
Test point 1	ANC/active sound control unit 20P connector No. 17
Test point 2	ANC/active sound control unit 20P connector No. 6

Does the voltage change when making a loud noise in front of the microphone?


	YES

Go to step 30.


	NO

Replace the rear ANC/active sound control microphone.?

27.

Open wire check (ANC R MIC+8V line, SH ANC R MIC line):

Open wire check (ANC R MIC+8V line, SH ANC R MIC line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	Rear ANC/active sound control microphone 2P connector: disconnected
Test point 1	ANC/active sound control unit 20P connector No. 17
Test point 2	ANC/active sound control unit 20P connector No. 6

Is there about 8.0 V?


	YES

There is an open in the wire between the ANC/active sound control unit and the rear ANC/active sound control microphone. Replace the affected shielded harness.?


	NO

The ANC R MIC+8V and SH ANC R MIC wires are not open. Go to step 28.

28.

Shorted wire check (ANC R MIC+8V line):

Shorted wire check (ANC R MIC+8V 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 (LOCK) mode
	Rear ANC/active sound control microphone 2P connector: disconnected
	ANC/active sound control unit 20P connector: disconnected
Test point 1	ANC/active sound control unit 20P connector No. 17
Test point 2	Body ground

Is there continuity?


	YES

There is a short to body ground in the wire between the ANC/active sound control unit and the rear ANC/active sound control microphone. Replace the affected shielded harness.?


	NO

The ANC R MIC+8V wire is not shorted to ground. Go to step 29.

29.

Shorted wire check (SH ANC R MIC line to ANC R MIC+8V line):

Shorted wire check (SH ANC R MIC line to ANC R MIC+8V line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Rear ANC/active sound control microphone 2P connector: disconnected
	ANC/active sound control unit 20P connector: disconnected
Test point 1	ANC/active sound control unit 20P connector No. 6
Test point 2	ANC/active sound control unit 20P connector No. 17

Is there continuity?


	YES

There is a short in the wires between the ANC/active sound control unit and the rear ANC/active sound control microphone. Replace the affected shielded harness.?


	NO

The SH ANC R MIC and the ANC R MIC+8V wires are not shorted. Go to step 30.

30.

Open wire check (F-CAN_H line, F-CAN_L line):

Open wire check (F-CAN_H line, F-CAN_L line)

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

?2.	Reconnect all the connectors.

?3.	Jump the SCS line with the HDS, and wait more than 1 minute.

?4.

Disconnect the following connectors.

PCM connector A (51P)

ANC/active sound control unit 20P connector

?5.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	ANC/active sound control unit 20P connector: disconnected

K24W1

Test point 1: ANC/active sound control unit 20P connector	Test point 2: PCM connector A (51P)
No. 4	No. 2
No. 5	No. 1

J35Y1,Y2

Test point 1: ANC/active sound control unit 20P connector	Test point 2: PCM connector A (51P)
No. 4	No. 9
No. 5	No. 10

Is there continuity?


	YES

The F-CAN_H wire and/or F-CAN_L wires are OK. Go to step 31.


	NO

Repair an open in the wire(s) between the ANC/active sound control unit and the PCM.?

31.

ANC/active sound control unit check (substitution):

ANC/active sound control unit check (substitution)

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

?2.	Substitute a known-good ANC/active sound control unit.

?3.	Reconnect all the connectors, and recheck.

Does the symptom go away?


	YES

Replace the original ANC/active sound control unit.?


	NO

Substitute a known-good PCM, and recheck.?

32.

Open wire check (MIC PWR line):

Open wire check (MIC PWR line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	Audio unit connector J (28P) No. 25
Test point 2	Body ground

Is there about 8.0 V?


	YES

Repair an open in the wire between the audio unit and the front HFL-ANC/active sound control microphone.?


	NO

Replace the audio unit.?

33.

Open wire check (MIC?line):

Open wire check (MIC?line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test point 1	Audio unit connector J (28P) No. 10
Test point 2	Body ground

Is there any voltage?


	YES

Replace the audio unit.?


	NO

Repair an open or high resistance in the wire between the audio unit and the front HFL-ANC/active sound control microphone.?