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

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 (ANC/active sound control system, others):

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

?1.	Do the Self-Diagnostic Function, and use the speaker check mode.

Did all speakers produce a tone?


	YES

Go to step 3.


	NO

Go to No sound is heard from the speaker(s) (without navigation, without touch screen) troubleshooting.?

3.

Self-diagnostic function check:

Self-diagnostic function check

?1.	Do the Self-Diagnostic Function, and use the ANC/active sound control system check mode.

Does the low-frequency hum sound continue sounding for about 1 minute?


	YES

Go to step 26.


	NO: The low-frequency hum sound sounding for about 1 second

Go to step 14.


	NO: The low-frequency hum sound is not heard

Go to step 4.

4.

Open wire check (+B BACK UP line):

Open wire check (+B BACK UP line)

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.

Measure the voltage between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
Test circuit	+B BACK UP
Test point 1	ANC/active sound control unit 20P connector No. 11 (WHT)
Test point 2	Body ground

Is there battery voltage?


	YES

The +B BACK UP wire is OK. Go to step 5.


	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.?

5.

Open wire check (IG1 METER line):

Open wire check (IG1 METER line)

?1.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?2.

Measure the voltage between test points 1 and 2.

Test condition	IG ON (II) or ON mode
Test circuit	IG1 METER
Test point 1	ANC/active sound control unit 20P connector No. 12 (BRN)
Test point 2	Body ground

Is there battery voltage?


	YES

The IG1 METER wire is OK. Go to step 6.


	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.?

6.

Open wire check (GND line):

Open wire check (GND line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	IG ON (II) or ON mode
Test circuit	GND
Test point 1	ANC/active sound control unit 20P connector No. 1 (BLK)
Test point 2	Body ground

Is there less than 0.2 V?


	YES

The GND wire is OK. Go to step 7.


	NO

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

7.

Open wire check (SWD+B line):

Open wire check (SWD+B line)

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

ANC/active sound control unit 20P connector

?3.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	IG ON (II) or ON mode
	ANC/active sound control unit 20P connector: disconnected
Test circuit	SWD+B
Test point 1	ANC/active sound control unit 20P connector No. 3 (LT GRN)
Test point 2	Body ground

Is there battery voltage?


	YES

The SWD+B wire is OK. Go to step 8.


	NO

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

8.

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

Determine possible failure area (ANC CHK2 line, others)

?1.	Do the Self-Diagnostic Function, and use the ANC/active sound control system check mode.

?2.	Press the No. 1 button.

?3.

Measure the voltage between test points 1 and 2.

Test condition	IG ON (II) or ON mode, displaying the ANC OFF
	ANC/active sound control unit 20P connector: disconnected
Test circuit	ANC CHK2
Test point 1	ANC/active sound control unit 20P connector No. 13 (PNK)
Test point 2	Body ground

Is there about 5.0 V?


	YES

The ANC CHK2 wire is OK. Go to step 11.


	NO

Go to step 9.

9.

Open wire check (ANC CHK2 line):

Open wire check (ANC CHK2 line)

?1.	Do the Self-Diagnostic Function, and use the ANC/active sound control system check mode.

?2.	Press the No. 1 button.

?3.

Measure the voltage between test points 1 and 2.

Test condition	IG ON (II) or ON mode, displaying the ANC OFF
	ANC/active sound control unit 20P connector: disconnected
Test circuit	ANC CHK2
Test point 1	Audio unit connector C (16P) No. 4 (PNK)
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 10.

10.

Shorted wire check (ANC CHK2 line):

Shorted wire check (ANC CHK2 line)

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

Audio unit connector C (16P)

?3.

Check for continuity between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
	ANC/active sound control unit 20P connector: disconnected
	Audio unit connector C (16P): disconnected
Test circuit	ANC CHK2
Test point 1	Audio unit connector C (16P) No. 4 (PNK)
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.?

11.

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

Shorted wire check (ANC SH line to another lines)

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connectors.

Audio unit connector C (16P)

?3.

Check for continuity between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
	ANC/active sound control unit 20P connector: disconnected
	Audio unit connector C (16P): disconnected

Test circuits	Connector: ANC/active sound control unit 20P connector
Test circuits	Test point 1	Test points 2
ANC SH to ANC R?, ANC R+, ANC F?, ANC F+	No. 8 (GRY)	No. 9 (GRN), No. 19 (BLK), No. 10 (WHT), No. 20 (RED)
ANC R? to ANC R+, ANC F?, ANC F+	No. 9 (GRN)	No. 19 (BLK), No. 10 (WHT), No. 20 (RED)
ANC R+ to ANC F?, ANC F+	No. 19 (BLK)	No. 10 (WHT), No. 20 (RED)
ANC F? to ANC F+	No. 10 (WHT)	No. 20 (RED)

Is there continuity?


	YES

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


	NO

The ANC wires are not shorted to ground. Go to step 12.

12.

Open wire check (ANC lines):

Open wire check (ANC lines)

?1.

Check for continuity between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
	ANC/active sound control unit 20P connector: disconnected
	Audio unit connector C (16P): disconnected

Test circuit	Test point 1: ANC/active sound control unit 20P connector	Test point 2: Audio unit connector C (16P)
ANC F+	No. 20 (RED)	No. 5 (RED)
ANC F?	No. 10 (WHT)	No. 6 (WHT)
ANC R+	No. 19 (BLK)	No. 13 (BLK)
ANC R?	No. 9 (GRN)	No. 14 (GRN)

Is there continuity?


	YES

The ANC wires are OK. Go to step 13.


	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.?

13.

ANC/active sound control unit check (substitution):

ANC/active sound control unit check (substitution)

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

?2.	Reconnect all the connectors, and recheck.

Does the symptom go away?


	YES

Replace the original ANC/active sound control unit.?


	NO

Replace the audio unit.?

14.

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	IG ON (II) or ON mode
Test circuit	MIC PWR
Test point 1	Front HFL-ANC/active sound control microphone 8P connector No. 4 (WHT)
Test point 2	Body ground

Is there about 8.0 V?


	YES

The MIC PWR wire is OK. Go to step 15.


	NO

Go to step 28.

15.

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	IG ON (II) or ON mode
Test circuit	MIC+
Test point 1	Front HFL-ANC/active sound control microphone 8P connector No. 1 (PNK)
Test point 2	Body ground

Is there less than 0.2 V?


	YES

The MIC+ wire is OK. Go to step 16.


	NO

Go to step 29.

16.

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

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

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

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

?3.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	IG ON (II) or ON mode
	Front HFL-ANC/active sound control microphone 8P connector: disconnected
Test circuit	ANC F MIC+8V
Test point 1	Front HFL-ANC/active sound control microphone 8P connector No. 8 (WHT)
Test point 2	Body ground

Is there about 8.0 V?


	YES

Go to step 17.


	NO

Go to step 18.

17.

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 ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

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

?3.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?4.

Measure the voltage between test points 1 and 2.

NOTE: Use the voltmeter in AC range.

Test condition	IG ON (II) or ON mode, make a loud noise like clapping your hands in front of the front HFL-ANC/active sound control microphone.
Test circuit	ANC F MIC+8V, SH ANC F MIC
Test point 1	ANC/active sound control unit 20P connector No. 18 (WHT)
Test point 2	ANC/active sound control unit 20P connector No. 7 (BLK)

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


	YES

Go to step 21.


	NO

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

18.

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	IG ON (II) or ON mode
	Front HFL-ANC/active sound control microphone 8P connector: disconnected
Test circuit	ANC F MIC+8V
Test point 1	ANC/active sound control unit 20P connector No. 18 (WHT)
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 19.

19.

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

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

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF 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	IG LOCK (0) or OFF mode
	Front HFL-ANC/active sound control microphone 8P connector: disconnected
	ANC/active sound control unit 20P connector: disconnected
Test circuit	ANC F MIC+8V
Test point 1	ANC/active sound control unit 20P connector No. 18 (WHT)
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 20.

20.

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	IG LOCK (0) or OFF mode
	Front HFL-ANC/active sound control microphone 8P connector: disconnected
	ANC/active sound control unit 20P connector: disconnected
Test circuit	SH ANC F MIC, ANC F MIC+8V
Test point 1	ANC/active sound control unit 20P connector No. 7 (BLK)
Test point 2	ANC/active sound control unit 20P connector No. 18 (WHT)

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

Replace the ANC/active sound control unit.?

21.

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

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

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

Rear ANC/active sound control microphone 2P connector

?3.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	IG ON (II) or ON mode
	Rear ANC/active sound control microphone 2P connector: disconnected
Test circuit	ANC R MIC+8V, SH ANC R MIC
Test point 1	Rear ANC/active sound control microphone 2P connector No. 1 (BLU)
Test point 2	Rear ANC/active sound control microphone 2P connector No. 2 (BLK)

Is there about 8.0 V?


	YES

Go to step 22.


	NO

Go to step 23.

22.

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 ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

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

?3.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?4.

Measure the voltage between test points 1 and 2.

NOTE: Use the voltmeter in AC range.

Test condition	IG ON (II) or ON mode, make a loud noise like clapping your hands in front of the rear ANC/active sound control microphone.
Test circuit	ANC R MIC+8V, SH ANC R MIC
Test point 1	ANC/active sound control unit 20P connector No. 17 (BLU)
Test point 2	ANC/active sound control unit 20P connector No. 6 (BLK)

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


	YES

Replace the ANC/active sound control unit.?


	NO

Replace the rear ANC/active sound control microphone.?

23.

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	IG ON (II) or ON mode
	Rear ANC/active sound control microphone 2P connector: disconnected
Test circuit	ANC R MIC+8V, SH ANC R MIC
Test point 1	ANC/active sound control unit 20P connector No. 17 (BLU)
Test point 2	ANC/active sound control unit 20P connector No. 6 (BLK)

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 24.

24.

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

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

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF 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	IG LOCK (0) or OFF mode
	Rear ANC/active sound control microphone 2P connector: disconnected
	ANC/active sound control unit 20P connector: disconnected
Test circuit	ANC R MIC+8V
Test point 1	ANC/active sound control unit 20P connector No. 17 (BLU)
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 25.

25.

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	IG LOCK (0) or OFF mode
	Rear ANC/active sound control microphone 2P connector: disconnected
	ANC/active sound control unit 20P connector: disconnected
Test circuit	SH ANC R MIC, ANC R MIC+8V
Test point 1	ANC/active sound control unit 20P connector No. 6 (BLK)
Test point 2	ANC/active sound control unit 20P connector No. 17 (BLU)

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

Replace the ANC/active sound control unit.?

26.

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 ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.	Jump the SCS line with the HDS.

?3.

Disconnect the following connectors.

PCM connector A (51P)

ANC/active sound control unit 20P connector

?4.

Check for continuity between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
	PCM connector A (51P): disconnected
	ANC/active sound control unit 20P connector: disconnected

Test circuit	Test point 1: ANC/active sound control unit 20P connector	Test point 2: PCM connector A (51P)
F CAN-H	No. 4 (WHT)	No. 2 (WHT)
F CAN-L	No. 5 (RED)	No. 1 (RED)

Is there continuity?


	YES

The F CAN-H wire and/or F CAN-L wires are OK. Go to step 27.


	NO

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

27.

ANC/active sound control unit check (substitution):

ANC/active sound control unit check (substitution)

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF 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.?

28.

Open wire check (MIC PWR line):

Open wire check (MIC PWR line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	IG ON (II) or ON mode
Test circuit	MIC PWR
Test point 1	Audio unit connector C (16P) No. 8 (WHT)
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.?

29.

Open wire check (MIC+ line):

Open wire check (MIC+ line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	IG ON (II) or ON mode
Test circuit	MIC+
Test point 1	Audio unit connector C (16P) No. 15 (PNK)
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.?