Audio System Symptom Troubleshooting - Poor AM or FM radio reception or interference (Display Audio (With Navigation))

Audio System Symptom Troubleshooting - Poor AM or FM radio reception or interference

Poor AM or FM radio reception or interference

NOTE:

Check the vehicle battery condition first.

Check for aftermarket accessories plugged into the vehicle accessory power sockets.

Check for any radio frequency modulators that are plugged into the FM antenna lead. These modulators allow customers to play audio from accessories like CD player or game consoles using the audio system, but they can create interference issues.

Check the radio reception in an open area. Compare it to a known-good vehicle whenever possible. Poor reception/interference can be caused by the following:

?	The radio station is far away
?	Atmospheric conditions are unfavorable
?	Tall buildings, mountains, or high-voltage power lines are nearby
?	Electrical loads like the rear window defroster, seat heaters, game consoles, etc.

Check the connectors for poor connections or loose terminals.

Problem verification:

Problem verification

?1.	Turn the vehicle to the ON mode.

?2.	Do the Seek Stop Test in the Sound Quality Diagnosis.

Is the test vehicle within 10 % of the known-good vehicle?


	YES

Multipath interference or weak station. Operation is normal.?


	NO

The failure is duplicated, go to step 2.

Determine possible failure area (antenna, others):

Determine possible failure area (antenna, others)

?1.	Go into the System Diagnostic Mode, and use the System Link to check the Remote Tuner icon status.

Is the Remote Tuner icon green?


	YES

Go to step 3.


	NO

Go to step 10.

Window antenna check:

Window antenna check

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

?2.

With the help of an assistant inside the vehicle, have the assistant shine a strong flashlight (A) along each antenna wire (B). Check from the outside of the vehicle for any breaks or openings in the antenna wires (the light shines through any breaks or cuts).

NOTE: It is easier to see the breaks if you do this test in a dark or shaded area.

Are there any breaks or cuts in the antenna wire?


	YES

Repair the window antenna. Go to window antenna repair, or replace the rear window if the damaged section is too long.?


	NO

Go to step 4.

Shorted wire check (AM/FM line):

Shorted wire check (AM/FM line)

?1.

Disconnect the following connector.

AM/FM antenna 1P connector

Tuner unit connector B (5P)

?2.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	AM/FM antenna 1P connector: disconnected
	Tuner unit connector B (5P): disconnected
Test point 1	Tuner unit connector B (5P) No. 2
Test point 2	Body ground

Is there continuity?


	YES

There is a short to body ground in the wire between the window antenna and the tuner unit. Replace the affected antenna lead.?


	NO

The AM/FM wire is not shorted to ground. Go to step 5.

Shorted wire check (AM/FM line to SH (AM/FM) line):

Shorted wire check (AM/FM line to SH (AM/FM) line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	AM/FM antenna 1P connector: disconnected
	Tuner unit connector B (5P): disconnected
Test point 1	Tuner unit connector B (5P) No. 2
Test point 2	Tuner unit connector B (5P) No. 4

Is there continuity?


	YES

There is a short in the wires between the window antenna and the tuner unit. Replace the affected antenna lead.?


	NO

The AM/FM antenna lead is OK. Go to step 6.

Open wire check (AM/FM line):

Open wire check (AM/FM line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	AM/FM antenna 1P connector: disconnected
	Tuner unit connector B (5P): disconnected
Test point 1	Tuner unit connector B (5P) No. 2
Test point 2	AM/FM antenna 1P connector No. 1

Is there continuity?


	YES

The AM/FM wire is not open. Go to step 7.


	NO

There is an open in the wire between the window antenna and the tuner unit. Replace the affected antenna lead.?

Shorted wire check (GA AUDIO lines) 1:

Shorted wire check (GA AUDIO lines) 1

?1.

Disconnect the following connectors.

Audio-navigation unit connector D (12P)

Tuner unit connector A (12P)

?2.

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

Test condition	Vehicle OFF (LOCK) mode
	Audio-navigation unit connector D (12P): disconnected
	Tuner unit connector A (12P): disconnected

Connector	Terminal
Tuner unit connector A (12P)	No. 9
	No. 3
	No. 10
	No. 4

Is there continuity?


	YES

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


	NO

The GA AUDIO wires are not shorted to ground. Go to step 8.

Shorted wire check (GA AUDIO lines) 2:

Shorted wire check (GA AUDIO lines) 2

?1.

Check for continuity between test points 1 and 2.

Test condition	OFF mode
	Audio-navigation unit connector E (5P): disconnected
	Tuner unit connector A (12P): disconnected

Connector
Test point 1: Tuner unit connector A (12P)	Test points 2: Tuner unit connector A (12P)
No. 5	No. 3, No. 9, No. 4, No. 10
No. 3	No. 9, No. 4, No. 10
No. 9	No. 4, No. 10
No. 4	No. 10

Is there continuity between any of the terminals?


	YES

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


	NO

The GA AUDIO wires are not shorted in the wires. Go to step 9.

Open wire check (GA AUDIO lines):

Open wire check (GA AUDIO lines)

?1.

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)	Test point 2: Audio-navigation unit connector D (12P)
No. 9	No. 9
No. 3	No. 3
No. 10	No. 10
No. 4	No. 4

Is there continuity?


	YES

Replace the tuner unit.?


	NO

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

10.

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

Determine possible failure area (GA +B 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. 12
Test point 2	Body ground

Is there battery voltage?


	YES

The GA +B wire is OK. Go to step 11.


	NO

Go to step 15.

11.

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 12.


	NO

Go to step 17.

12.

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 13.


	NO

Go to step 18.

13.

Audio-navigation unit check:

Audio-navigation 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

Go to step 14.


	NO

Replace the audio-navigation unit.?

14.

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

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

Replace the tuner unit.?


	NO

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

15.

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 16.

16.

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.?

17.

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.?

18.

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.?