Audio System Symptom Troubleshooting - Poor AM or FM radio reception or interference(Without Navigation, With Display Audio)
NOTE:
- Check the vehicle 12 volt battery condition first .
- Check for aftermarket accessories plugged into the vehicle accessory power sockets.
- 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
- Aftermarket metallic window tinting or electronic accessories
- Check the connectors for poor connections or loose terminals.
- 1. Problem verification:
- 1. Park the vehicle in an open area.
- 2. Turn the vehicle to the ON mode.
- 3. Turn on the audio system, and select AM or FM radio station.
Is the sound quality normal?
YES
Intermittent failure, the system is OK at this time.
NO
The failure is duplicated, go to step 2.
- 2. Seek stop test:
- 1. Do the Seek Stop Test in the Sound Quality Diagnosis - Refer to: Audio System Sound Quality DiagnosisAudio System Diagnostic Mode .
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 3.
- 3. Determine possible failure area (charging system and ignition system, others):
- 1. Start the engine.
- 2. Check the reception/interference while the engine is running.
Is there noise (static or whine) only with the engine running?
YES
Check the antenna and radio grounds. If OK, check the charging system and the ignition system.
NO
Go to step 4.
- 4. Determine possible failure area (SWD +B line, AM/FM line):
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connector.
Roof antenna connector A (3P) - 3. Turn the vehicle to the ON mode, and turn on the audio system.
- 4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Roof antenna connector A (3P): disconnected Test point 1 Roof antenna connector A (3P) No. 1 Test point 2 Body ground Is there battery voltage?
YES
The SWD +B wire is OK. Go to step 5.
NO
Go to step 10.
- 5. Shorted wire check (AM/FM line):
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connector.
Audio unit connector J (3P) - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Roof antenna connector A (3P): disconnected Audio unit connector J (3P): disconnected Test point 1 Audio unit connector J (3P) No. 2 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio) Test point 2 Body ground Is there continuity?
YES
Replace the antenna lead and/or the sublead.
NO
The AM/FM wire is not shorted to ground. Go to step 6.
- 6. 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 Roof antenna connector A (3P): disconnected Audio unit connector J (3P): disconnected Test point 1 Audio unit connector J (3P) No. 2 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio) Test point 2 Audio unit connector J (3P) No. 3 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio) Is there continuity?
YES
Replace the antenna lead and/or the sublead.
NO
The AM/FM wire is not shorted to the SH (AM/FM) wire. Go to step 7.
- 7. Open wire check (AM/FM line):
- 1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Roof antenna connector A (3P): disconnected Audio unit connector J (3P): disconnected Test point 1 Audio unit connector J (3P) No. 2 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio) Test point 2 Roof antenna connector A (3P) No. 2 Is there continuity?
YES
The AM/FM wire is OK. Go to step 8.
NO
Replace the antenna lead and/or the sublead.
- 8. Open wire check (SH (AM/FM) line):
- 1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Roof antenna connector A (3P): disconnected Audio unit connector J (3P): disconnected Test point 1 Audio unit connector J (3P) No. 3 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio) Test point 2 Roof antenna connector A (3P) No. 3 Is there continuity?
YES
The SH (AM/FM) wire is OK. Go to step 9.
NO
Replace the antenna lead and/or the sublead.
- 9. Roof antenna check (substitution):
- 1. Substitute a known-good roof antenna .
- 2. Reconnect all the connectors, and recheck.
Does the symptom go away?
YES
Replace the original roof antenna .
NO
Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .
- 10. Shorted wire check (SWD +B line):
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connector.
Audio unit connector J (3P) - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Roof antenna connector A (3P): disconnected Audio unit connector J (3P): disconnected Test point 1 Roof antenna connector A (3P) No. 1 Test point 2 Body ground Is there continuity?
YES
Repair a short to body ground in the wire between the audio unit and the roof antenna.
NO
The SWD +B wire is not shorted to ground. Go to step 11.
- 11. Open wire check (SWD +B line):
- 1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Roof antenna connector A (3P): disconnected Audio unit connector J (3P): disconnected Test point 1 Audio unit connector J (3P) No. 1 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio)Audio Unit Connector for Inputs and Outputs(With Normal Audio) Test point 2 Roof antenna connector A (3P) No. 1 Is there continuity?
YES
Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .
NO
Repair an open in the wire between the audio unit and the roof antenna.
