Radio Volume Is Low Or Interference Noise Occurs

CAUTION:

If non-genuine electrical parts are installed, they may cause interference noise.
Refer to the following diagnostic procedure if equipped with the digital radio using the Internet connection.

Check SUBARU STARLINK service: Ref. to ENTERTAINMENT>Diagnostics with Phenomenon>INSPECTION>CHECK SUBARU STARLINK SERVICE .
Bluetooth connection cannot be established: Ref. to ENTERTAINMENT>Diagnostics with Phenomenon>INSPECTION>Bluetooth CONNECTION CANNOT BE ESTABLISHED .
Check connection between smartphone and unit: Ref. to ENTERTAINMENT>Diagnostics with Phenomenon>INSPECTION>CHECK CONNECTION BETWEEN SMARTPHONE AND UNIT .

Wiring diagram:

Audio system: Ref. to WIRING SYSTEM>Audio System>WIRING DIAGRAM .
Navigation system: Ref. to WIRING SYSTEM>Navigation System>WIRING DIAGRAM .

Fig 1: Radio Volume Low Wiring Diagram

G11268691

Courtesy of SUBARU OF AMERICA, INC.

CHECK SYMPTOM.
Check in which condition (place) the noise occurs.

Does it occur in any places?
- Yes : Go to 2.
- No : Radio wave reception condition is poor. (In tunnel, buildings, etc.) There is no failure on the vehicle.
CHECK ANTENNA.
Check for poor contact of connectors or terminals.

Is the connector OK?
- Yes : Go to 3.
- No : Repair or replace the harness.
CHECK HARNESS.
Check the antenna harness for an open or short circuit, and check the booster.

Is harness normal?
- Yes : Go to 4.
- No : Repair or replace the harness.
CHECK UNIT GROUND CIRCUIT.
Check the unit ground connector (1P on back side).

Is the engine ground circuit normal?
- Yes : Go to 5.
- No : Repair or replace the ground circuit.
CHECK ENVIRONMENTAL CONDITION.
Check if any external devices which emit strong electromagnetic waves and noises, such as a radio antenna, is installed inside the vehicle.

Is an external device installed?
- Yes : Remove the external device. There is no failure if it returns to normal. If the fault is not fixed: Go to 6.
- No : Go to 6.
CHECK NOISE OCCURRENCE CONDITION.

Stop the engine, and turn the ignition switch to ON to check for noise occurrence.

Does the noise occur while the engine stops?

Yes : Replace the unit. Ref. to ENTERTAINMENT>Audio .
No : Check that the engine ignition system, generator, engine ground circuit and chassis ground circuit are connected securely.
NOTE: When the volume of Aha and Pandora is low, connect the smartphone to the Internet, and check that Aha and Pandora is audible on the smartphone itself. When it is inaudible, or the volume is too low, there is a problem with the smartphone, Internet connection or service provider. When it is audible with the smartphone without any troubles, there is a problem with connection to the vehicle (USB connection or Bluetooth connection).