Radio Volume Is Low Or Interference Noise Occurs
Probable cause:
Reception environment, antenna circuit malfunction, influence by external devices, ground circuit malfunction, unit body malfunction
Wiring diagram:
Audio and navigation system Ref. to WIRING SYSTEM>AUDIO AND NAVIGATION SYSTEM>WIRING DIAGRAM .
- 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 COCKPIT CONTROL (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON>INSPECTION>CHECK SUBARU STARLINK SERVICE .
- Bluetooth connection cannot be established: Ref. to COCKPIT CONTROL (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON>INSPECTION>BLUETOOTH CONNECTION CANNOT BE ESTABLISHED .
- Check connection between smartphone and unit: Ref. to COCKPIT CONTROL (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON>INSPECTION>CHECK CONNECTION BETWEEN SMARTPHONE AND UNIT .
- Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to COCKPIT CONTROL (DIAGNOSTICS)>General Description>CAUTION .
- 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 check result 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 the check result OK?
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 check result OK?
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 the check result OK?
Yes: Go to 6 .
No: Remove the external device. There is no failure if it returns to normal. If the fault is not fixed: Go to 6 .
- CHECK NOISE OCCURRENCE CONDITION
.
Stop the engine, and with the ignition switch ON, check for noise occurrence.
Does the noise occur while the engine stops?
Yes: Replace the cockpit control module. Ref. to ENTERTAINMENT & MONITORING>COCKPIT DISPLAY .
No: Check that the engine ignition system, generator, engine ground circuit and chassis ground circuit are connected securely.